Method and device for determining the degree of chemical weathering of a provenance area

Abstract

The application provides a method and device for determining the chemical weathering degree of a provenance area, wherein the method for determining the chemical weathering degree of the provenance area comprises the following steps: obtaining at least one initial argillaceous rock sample of a target provenance area; for any one initial argillaceous rock sample, judging whether the initial argillaceous rock sample has experienced re-cycling in the case that the composition variation index ICV of the initial argillaceous rock sample is less than a set threshold value; determining the initial argillaceous rock sample which has not experienced re-cycling as a target argillaceous rock sample; calculating the chemical alteration index CIA of each target argillaceous rock sample, and determining the chemical weathering degree of the target provenance area according to each chemical alteration index CIA. The application can exclude the influence of sedimentary differentiation, select the initial argillaceous rock sample which has a composition variation index ICV less than a set threshold value and has not experienced re-cycling, exclude the influence of re-cycling, and further improve the accuracy of CIA, so that the chemical weathering degree is more accurate and has higher reliability.

Description

Technical Field

[0001] This invention relates to the fields of solid mineral exploration technology and rock geochemistry technology, and in particular to a method and apparatus for determining the degree of chemical weathering in a source area. Background Technology

[0002] With the continuous development of solid mineral exploration technology and rock geochemistry technology, research on continental chemical weathering has become increasingly in-depth. Continental chemical weathering is of great significance to the Earth's surface material cycle and global climate change, and how to quantitatively reconstruct the degree of paleochemical weathering has always been a hot topic in global change research.

[0003] Based on the introduction of indices such as the Chemical Index of Alteration (CIA), Chemical Index of Weathering (CIW), Plagioclase Index of Alteration (PIA), Weather (Mobility) Indices, Mineral Index of Alternation (MIA), and Weathering Index (WIP), many scholars have begun to use these indices to quantitatively analyze the degree of chemical weathering and paleoclimate in source areas. In particular, they play an important indicative role in major climate events, such as the Neoproterozoic glaciation, the Late Ordovician glaciation, the Early Permian glaciation-interglacial transition, the Paleogene Eocene-Oligocene glaciation-glaciation transition, and source-sink systems.

[0004] Although the indicative significance of the aforementioned indices has been continuously deepened in previous studies, many limiting factors in their application remain poorly understood, leading to deviations in the determination of the degree of chemical weathering in source areas. Furthermore, a systematic process for assessing the degree of chemical weathering in source areas is lacking. Therefore, an effective solution is urgently needed to address these issues. Summary of the Invention

[0005] To address the problems existing in the prior art, embodiments of the present invention provide a method and apparatus for determining the degree of chemical weathering in a source region.

[0006] This invention provides a method for determining the degree of chemical weathering in a source region, comprising:

[0007] Obtain at least one initial argillaceous rock sample from the target source region;

[0008] For any initial argillaceous rock sample, if the compositional variation index (ICV) of the initial argillaceous rock sample is less than a set threshold, it is determined whether the initial argillaceous rock sample has undergone recycle.

[0009] The initial argillaceous rock sample that did not undergo recycle was identified as the target argillaceous rock sample;

[0010] Calculate the chemical alteration index (CIA) of each target argillaceous rock sample, and determine the degree of chemical weathering of the target source area based on each CIA.

[0011] Optionally, before determining whether the initial mudstone sample has undergone recycle, the method further includes:

[0012] Trace element analysis was performed on each initial argillaceous rock sample to obtain the amount of each trace element in each initial argillaceous rock sample, wherein the trace elements include at least thorium (Th), scandium (Sc), and zirconium (Zr).

[0013] Accordingly, determining whether the initial argillaceous rock sample has undergone recycle includes:

[0014] Based on the amount of each trace element, the target point of the initial mudstone sample is determined on the recycle discrimination map, where the horizontal axis of the recycle discrimination map is Zr / Sc and the vertical axis is Th / Sc.

[0015] If the target point is located on the trend line of source region composition change in the recycle discrimination diagram, then it is determined that the initial mudstone sample has not undergone recycle.

[0016] Optionally, before determining whether the initial argillaceous rock sample has undergone recycle when the compositional variation index (ICV) of the initial argillaceous rock sample is less than a set threshold, the method further includes:

[0017] Major element determination was performed on each initial argillaceous rock sample to obtain the amount of substance of each major element in each initial argillaceous rock sample. The major elements include at least Al2O3, CaO, Na2O, K2O, Fe2O3, MgO, MnO and TiO2.

[0018] The compositional variation index (ICV) of each initial argillaceous rock sample was calculated based on the amount of each major element.

[0019] Optionally, the calculation of the compositional variation index (ICV) of each initial argillaceous rock sample based on the amount of each major element includes:

[0020] For any initial argillaceous rock sample, the amounts of CaO, Na2O, K2O, Fe2O3, MgO, MnO, and TiO2 in the initial argillaceous rock sample are added together to obtain the first total amount of matter.

[0021] The ratio of the total amount of the first substance to the amount of Al2O3 in the initial argillaceous rock sample is determined as the compositional variation index (ICV) of the initial argillaceous rock sample.

[0022] Optionally, the calculation of the chemical alteration index (CIA) for each target argillaceous rock sample includes:

[0023] For any given target argillaceous rock sample, determine the amount of CaO contained in the silicate minerals within the target argillaceous rock sample;

[0024] The amounts of Al2O3, Na2O, and K2O in the target argillaceous rock sample, and the amount of CaO contained in the silicate minerals, are added together to obtain the second total amount of matter.

[0025] The chemical alteration index (CIA) of the target argillaceous rock sample is obtained by multiplying the ratio of the amount of Al2O3 in the target argillaceous rock sample to the sum of the amounts of the second substance and 100.

[0026] Optionally, determining the amount of CaO contained in the silicate minerals in the target argillaceous rock sample includes:

[0027] Determine the amount of CaO remaining in the target argillaceous rock sample after removing CaO from non-silicate minerals;

[0028] If the amount of remaining CaO is less than the amount of Na2O in the target argillaceous rock sample, the amount of remaining CaO shall be determined as the amount of CaO contained in the silicate minerals in the target argillaceous rock sample.

[0029] If the amount of remaining CaO is greater than or equal to the amount of Na2O in the target argillaceous rock sample, the amount of Na2O in the target argillaceous rock sample shall be determined as the amount of CaO contained in the silicate minerals of the target argillaceous rock sample.

[0030] Optionally, determining the degree of chemical weathering of the target source region based on each Chemical Alteration Index (CIA) includes:

[0031] Using the A-CN-K triangle diagram or setting up a CIA corr. The formula is used to correct each of the chemical alteration indices (CIA) to obtain the corrected chemical alteration indices (CIA).

[0032] The corrected chemical alteration indices (CIAs) are compared with the quantitative analysis standard to obtain the degree of chemical weathering of the target source area. The quantitative analysis standard includes the correspondence between the chemical alteration index (CIA) of the argillaceous rock and the degree of chemical weathering of the source area.

[0033] Optionally, before calculating the chemical alteration index (CIA) of each target argillaceous rock sample, the method further includes:

[0034] For any initial argillaceous rock sample, if the compositional variation index (ICV) of the initial argillaceous rock sample is greater than or equal to a set threshold, the initial argillaceous rock sample is determined as the target argillaceous rock sample.

[0035] The present invention also provides an apparatus for determining the degree of chemical weathering in a source region, comprising:

[0036] The acquisition module is configured to acquire at least one initial argillaceous rock sample from the target source region;

[0037] The judgment module is configured to determine whether the initial argillaceous rock sample has undergone recycle if the compositional variation index (ICV) of the initial argillaceous rock sample is less than a set threshold.

[0038] The determination module is configured to identify the initial argillaceous rock sample that has not undergone recycle as the target argillaceous rock sample;

[0039] The calculation module is configured to calculate the chemical alteration index (CIA) of each target mudstone sample and determine the degree of chemical weathering of the target source area based on each CIA.

[0040] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method for determining the degree of chemical weathering of a source region as described above.

[0041] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for determining the degree of chemical weathering of a source region as described in any of the above.

[0042] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the method for determining the degree of chemical weathering of a source region as described above.

[0043] The method and apparatus for determining the degree of chemical weathering in a source area provided by this invention obtain at least one initial argillaceous rock sample from the target source area. This means using the argillaceous rock from the target source area as a sample, avoiding sedimentary differentiation that occurs during transport and deposition of the parent rock, thus eliminating the influence of sedimentary differentiation on the calculation of the chemical alteration index. By identifying initial argillaceous rock samples with an ICV (Index of Compositional Variation) less than a set threshold and without recycle, the influence of recycle and further weathering in the depositional zone on the calculation of the chemical alteration index is eliminated. Furthermore, by excluding sedimentary differentiation, recycle, and further weathering in the depositional zone, the chemical alteration index (CIA) of each target argillaceous rock sample is calculated, improving the accuracy of the CIA. This makes the determination of the degree of chemical weathering in the target source area based on the CIA more accurate and reliable. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0045] Figure 1 This is one of the flowcharts illustrating the method for determining the degree of chemical weathering in a source region provided by the present invention;

[0046] Figure 2 This is the recycle action discrimination diagram provided by the present invention;

[0047] Figure 3 This is one of the A-CN-K triangular diagrams provided by this invention;

[0048] Figure 4 This is the second A-CN-K triangle diagram provided by this invention;

[0049] Figure 5 This is the second flowchart illustrating the method for determining the degree of chemical weathering in a source region provided by the present invention.

[0050] Figure 6 This is a schematic diagram of the device for determining the degree of chemical weathering in a source area provided by the present invention;

[0051] Figure 7 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0053] The following is combined Figures 1 to 5 The method for determining the degree of chemical weathering in the source region provided by this invention will be described in detail. Figure 1 This is one of the flowcharts illustrating the method for determining the degree of chemical weathering in a source region provided by the present invention. See [link / reference]. Figure 1 As shown, the method includes steps 101-104, wherein:

[0054] Step 101: Obtain at least one initial mudstone sample from the target source area.

[0055] First, it should be noted that the subject of this invention can be any electronic device capable of determining the degree of chemical weathering in the source area, such as any smartphone, smartwatch, desktop computer, laptop, etc.

[0056] Specifically, the provenance area, also known as the source area, refers to the area in the basin where clastic material originates or is located. Correspondingly, the target provenance area is the provenance area where the degree of chemical weathering is to be determined. Mudstone refers to sedimentary rocks primarily composed of clay minerals with a grain size less than 0.0039 mm (>50%). A mudstone sample refers to mudstone collected from the target provenance area.

[0057] In practical applications, weathering products of the source rock undergo sedimentary differentiation during transport and deposition, leading to differences in clay mineral content between sandstone and argillaceous rocks. This can result in deviations or errors in the determination of the chemical weathering degree of the source area when using both sandstone and argillaceous rocks as source area samples. Therefore, it is possible to use samples of the same type to determine the chemical weathering degree of the source area, such as sandstone or argillaceous rock, thereby eliminating the influence of sedimentary differentiation on the calculation of the chemical alteration index.

[0058] Parent rock, also known as rock, is an aggregate of one or more types of rocks that provides ore-forming materials or is directly related to ore formation during the mineralization process. Sandstone is a sedimentary rock, specifically a clastic rock with a grain size of 0.0625-2 mm and a particle size of more than 50%.

[0059] Because sandstone contains relatively few clay minerals, the calculated Chemical Alteration Index (CIA) is lower. Therefore, the CIA calculated using sandstone has a larger deviation and lower reliability compared to that calculated using argillaceous rocks. Furthermore, argillaceous rocks have better homogeneity and low post-depositional permeability, better preserving source area information, making them more suitable than other clastic rocks (such as sandstone) for studying the weathering degree and paleoclimate of the source area.

[0060] Therefore, in order to eliminate the influence of sedimentary differentiation on the calculation of the chemical alteration index (CIA) and improve the accuracy and reliability of the calculated CIA, this invention uses argillaceous rocks as samples to determine the degree of chemical weathering in the source area, that is, to obtain at least one initial argillaceous rock sample from the target source area.

[0061] Step 102: For any initial argillaceous rock sample, if the compositional variation index (ICV) of the initial argillaceous rock sample is less than a set threshold, determine whether the initial argillaceous rock sample has undergone recycle.

[0062] Specifically, recycleing is also known as recirculation. The compositional variation index (ICV) can be used to estimate the original compositional changes of clastic rocks, determining whether a rock sequence represents the first deposition or sediments originating from recycleing. A threshold is set to measure the level of clay mineral content in the initial argillaceous rock sample, preferably 1.

[0063] In practical applications, after obtaining at least one initial argillaceous rock sample from the target source area, it is necessary to calculate the compositional variation index (ICV) for each initial argillaceous rock sample, and then compare the ICV of each initial argillaceous rock sample with a set threshold. For initial argillaceous rock samples with an ICV less than the set threshold, it indicates that the initial argillaceous rock sample contains a high content of clay minerals such as kaolinite, montmorillonite, and sericite, representing that it may have undergone recycle or strong weathering under initial depositional conditions.

[0064] Since recycleing affects the chemical alteration index (CIA), it is necessary to screen initial argillaceous rock samples with an ICV (Index of Compositional Variation) less than a set threshold, i.e., to determine whether the initial argillaceous rock samples have undergone recycleing.

[0065] Step 103: The initial mudstone sample that has not undergone recycle is identified as the target mudstone sample.

[0066] In practical applications, because recycles tend to overestimate the calculated Chemical Alteration Index (CIA), initial argillaceous rock samples that have undergone recycles cannot be used for CIA calculation. Therefore, initial argillaceous rock samples that have not undergone recycles are selected as the target argillaceous rock samples for CIA calculation, which in turn determines the degree of chemical weathering in the target source area. This eliminates the influence of recycles and further weathering in the sedimentary zone.

[0067] Step 104: Calculate the chemical alteration index (CIA) of each target mudstone sample, and determine the degree of chemical weathering of the target source area based on the CIA.

[0068] Specifically, the Chemical Alteration Index (CIA) is a chemical indicator used to assess the degree of chemical weathering in a source area. Chemical weathering refers to the alteration and decomposition of the chemical composition of rocks. The degree of chemical weathering refers to the extent to which chemical weathering damages the parent rock in the target source area.

[0069] In practical applications, after identifying the target argillaceous rock samples, the Chemical Alteration Index (CIA) of each sample can be calculated based on its parameters. Then, the degree of chemical weathering in the source area is determined based on the CIA and quantitative analysis standards. These quantitative analysis standards include the correlation between the CIA of the argillaceous rock and the degree of chemical weathering in the source area.

[0070] The method for determining the degree of chemical weathering in a source area provided by this invention obtains at least one initial argillaceous rock sample from the target source area. This method uses the argillaceous rock from the target source area as a sample, avoiding sedimentary differentiation that occurs during transport and deposition, thus eliminating the influence of sedimentary differentiation on the calculation of the chemical alteration index. By identifying initial argillaceous rock samples with an ICV (Index of Compositional Variation) less than a set threshold and without recycle, the influence of recycle and further weathering in the depositional zone on the calculation of the chemical alteration index is eliminated. Furthermore, by excluding sedimentary differentiation, recycle, and further weathering in the depositional zone, the chemical alteration index (CIA) of each target argillaceous rock sample is calculated, improving the accuracy of the CIA. This makes the determination of the degree of chemical weathering in the target source area based on the CIA more accurate and reliable.

[0071] In one or more optional embodiments of the present invention, to improve the accuracy of determining whether recycle has occurred, the determination of whether the initial argillaceous rock sample has undergone recycle can be based on trace elements in the initial argillaceous rock sample. That is, before determining whether the initial argillaceous rock sample has undergone recycle, the method further includes:

[0072] Trace element analysis was performed on each initial argillaceous rock sample to obtain the amount of each trace element in each initial argillaceous rock sample, wherein the trace elements include at least thorium (Th), scandium (Sc), and zirconium (Zr).

[0073] Accordingly, determining whether the initial argillaceous rock sample has undergone recycle includes:

[0074] Based on the amount of each trace element, the target point of the initial mudstone sample is determined on the recycle discrimination map, where the horizontal axis of the recycle discrimination map is Zr / Sc and the vertical axis is Th / Sc.

[0075] If the target point is located on the trend line of source region composition change in the recycle discrimination diagram, then it is determined that the initial mudstone sample has not undergone recycle.

[0076] Specifically, the amount of substance represents a collection containing a certain number of particles, and the unit is the mole. The recycle discrimination diagram is also known as the Th / Sc-Zr / Sc diagram; see [link to diagram]. Figure 2 The recycle discrimination diagram provided by this invention is shown. The recycle discrimination diagram (Th / Sc-Zr / Sc diagram) uses Zr / Sc as the horizontal axis and Th / Sc as the vertical axis. The trend line of compositional variation in the source region, i.e. Figure 2 The line representing the trend of compositional changes in the source region serves as a reference standard for assessing whether recycle has occurred.

[0077] In practical applications, trace element analysis can be performed on all initial argillaceous rock samples. To reduce data processing and improve the efficiency of determining the degree of chemical weathering, trace element analysis can also be performed only on initial argillaceous rock samples with an ICV (Index of Composition Variation) less than a set threshold.

[0078] Specifically, inductively coupled plasma mass spectrometry (ICP-MS) can be used to determine the trace elements in the initial argillaceous rock samples, obtaining at least the mass percentages of thorium (Th), scandium (Sc), and zirconium (Zr), laying the foundation for excluding the influence of recycles and further weathering in the sedimentary zone. Other methods, or methods that may be implemented in the future, can also be used to determine the trace elements in the initial argillaceous rock samples; this invention does not limit these methods.

[0079] To ensure the accuracy of trace element determination, as a preferred method, the initial argillaceous rock sample can be determined according to the national standard method for element determination, namely, according to the "Methods for Chemical Analysis of Silicate Rocks Part 30: Determination of 44 Elements" (GB / T14506.30-2010), to obtain the mass percentages of thorium (Th), scandium (Sc), and zirconium (Zr) in the initial argillaceous rock sample.

[0080] After determining the mass percentages of thorium (Th), scandium (Sc), and zirconium (Zr) in the initial argillaceous rock sample, the amounts of thorium (Th), scandium (Sc), and zirconium (Zr) in the initial argillaceous rock sample were calculated and converted based on the mass of the initial argillaceous rock sample and the mass percentages of thorium (Th), scandium (Sc), and zirconium (Zr).

[0081] Furthermore, the first ratio of the amount of zirconium (Zr) to scandium (Sc) in the initial argillaceous rock sample and the second ratio of the amount of thorium (Th) to scandium (Sc) are calculated. The first and second ratios are then used as coordinates to map the recycle discrimination map to obtain the target point.

[0082] If the target point lies on the source region composition variation trend line in the recycle discrimination diagram, it indicates that the initial argillaceous rock sample underwent intense weathering under the initial depositional conditions. This eliminates the influence of recycle and further weathering in the depositional zone on the calculation of the chemical alteration index, thus confirming that the initial argillaceous rock sample did not undergo recycle. If the target point does not lie on the source region composition variation trend line in the recycle discrimination diagram, or falls on... Figure 2 The "recycled change trend" line indicates that the initial mudstone sample underwent recycle and cannot be used to calculate the chemical alteration index (CIA).

[0083] In the above embodiments, by measuring the trace elements in the initial argillaceous rock sample, the amount of each trace element is obtained. Based on the amount of trace elements and the Th / Sc-Zr / Sc diagram, it is possible to more intuitively and accurately determine whether the initial argillaceous rock sample has undergone recycle, making the judgment of recycle more rapid and efficient.

[0084] Optionally, after obtaining at least one initial argillaceous rock sample from the target source area, it is necessary to calculate the compositional variation index (ICV) of each initial argillaceous rock sample before comparing the ICV of each initial argillaceous rock sample with a set threshold. That is, before determining whether the initial argillaceous rock sample has undergone recycle if the ICV of the initial argillaceous rock sample is less than the set threshold, the method further includes:

[0085] Major element determination was performed on each initial argillaceous rock sample to obtain the amount of each major element in each initial argillaceous rock sample. The major elements included at least aluminum oxide (Al2O3), calcium oxide (CaO), sodium oxide (Na2O), potassium oxide (K2O), iron oxide (Fe2O3), magnesium oxide (MgO), manganese oxide (MnO), and titanium dioxide (TiO2).

[0086] The compositional variation index (ICV) of each initial argillaceous rock sample was calculated based on the amount of each major element.

[0087] Specifically, X-ray fluorescence spectrometry (XRF) can be used to determine the major elements in each initial argillaceous rock sample, obtaining at least the mass percentages of aluminum oxide (Al₂O₃), calcium oxide (CaO), sodium oxide (Na₂O), potassium oxide (K₂O), iron oxide (Fe₂O₃), magnesium oxide (MgO), manganese oxide (MnO), and titanium dioxide (TiO₂), providing a data basis for calculating the chemical alteration index (CIA). Other methods, or methods that may be implemented in the future, can also be used to determine the major elements in each initial argillaceous rock sample; this invention is not limited to these methods. Furthermore, major elements such as phosphorus pentoxide (P₂O₅) in the initial argillaceous rock samples can also be determined.

[0088] To ensure the accuracy of major element determination, it is preferable to determine the major elements in the initial argillaceous rock sample according to the national standard method for element determination, namely, according to the "Methods for Chemical Analysis of Silicate Rocks Part 28: Determination of 16 Major and Minor Components" (GB / T14506.28-2010), to obtain the mass percentages of aluminum oxide (Al2O3), calcium oxide (CaO), sodium oxide (Na2O), potassium oxide (K2O), iron oxide (Fe2O3), magnesium oxide (MgO), manganese oxide (MnO), and titanium dioxide (TiO2) in the initial argillaceous rock sample.

[0089] After determining the mass percentages of aluminum oxide (Al₂O₃), calcium oxide (CaO), sodium oxide (Na₂O), potassium oxide (K₂O), iron oxide (Fe₂O₃), magnesium oxide (MgO), manganese oxide (MnO), and titanium dioxide (TiO₂) in the initial argillaceous rock sample, calculations were performed based on the mass of the initial argillaceous rock sample and the mass percentages of these components to obtain the amounts of these substances in the initial argillaceous rock sample.

[0090] Furthermore, for each initial argillaceous rock sample, the amounts of aluminum oxide (Al2O3), calcium oxide (CaO), sodium oxide (Na2O), potassium oxide (K2O), iron oxide (Fe2O3), magnesium oxide (MgO), manganese oxide (MnO), and titanium dioxide (TiO2) are input into the calculation formula of the compositional variation index (ICV) or a pre-trained compositional variation index determination model to obtain the compositional variation index (ICV) of the initial argillaceous rock sample.

[0091] In the above embodiments, by measuring the major elements of the initial mudstone sample and determining the compositional variation index (ICV) based on the amount of substance of multiple major elements, the efficiency and accuracy of determining the compositional variation index (ICV) can be improved, and a data foundation is laid for determining the degree of chemical weathering.

[0092] In one or more optional embodiments of the present invention, the amount of each major element can be input into the formula for calculating the compositional variation index (ICV) to obtain the ICV of each initial argillaceous rock sample. That is, the specific implementation process of calculating the ICV of each initial argillaceous rock sample based on the amount of each major element can be as follows:

[0093] For any initial argillaceous rock sample, the amounts of calcium oxide (CaO), sodium oxide (Na2O), potassium oxide (K2O), iron oxide (Fe2O3), magnesium oxide (MgO), manganese oxide (MnO), and titanium dioxide (TiO2) in the initial argillaceous rock sample are added together to obtain the first total amount of matter.

[0094] The ratio of the total amount of the first substance to the amount of aluminum oxide (Al2O3) in the initial argillaceous rock sample is determined as the compositional variation index (ICV) of the initial argillaceous rock sample.

[0095] Specifically, the compositional variation index (ICV) can be used to determine whether the material in the source region has undergone recycle. The formula for calculating the compositional variation index (ICV) is shown in formula (1):

[0096] ICV=(Fe2O3+K2O+Na2O+CaO+MgO+MnO+TiO2) / A12O3 (1)

[0097] In formula (1), each major element (Al2O3, Fe2O3, K2O, Na2O, CaO, MgO, MnO and TiO2) refers to the amount of substance, and its unit is mole.

[0098] For example, an initial argillaceous rock sample contains 15, 1, 2, 3, 4, 5, 6 and 7 moles of aluminum oxide (Al2O3), calcium oxide (CaO), sodium oxide (Na2O), potassium oxide (K2O), iron oxide (Fe2O3), magnesium oxide (MgO), manganese oxide (MnO), and titanium dioxide (TiO2), respectively. Then, the total amount of Fe2O3 + K2O + Na2O + CaO + MgO + MnO + TiO2, i.e., the first mole, is 1 + 2 + 3 + 4 + 5 + 6 + 7 = 28. The compositional variation index (ICV) of this initial argillaceous rock sample is 28 / 15 = 1.87.

[0099] In the above embodiments, by inputting the amount of matter of multiple major elements of the initial argillaceous rock sample into the calculation formula of the composition variation index ICV, the composition variation index ICV of the initial argillaceous rock sample can be obtained quickly and accurately, thereby improving the efficiency of determining the degree of chemical weathering.

[0100] Optionally, to improve computational efficiency, the amount of some major elements in the target argillaceous rock sample can be input into the calculation formula for the Chemical Alteration Index (CIA) to obtain the CIA of the target argillaceous rock sample. That is, the specific implementation process for calculating the CIA of each target argillaceous rock sample can be as follows:

[0101] For any given target argillaceous rock sample, determine the amount of calcium oxide (CaO) contained in the silicate minerals within the target argillaceous rock sample.

[0102] The total amount of aluminum oxide (Al2O3), sodium oxide (Na2O), and potassium oxide (K2O) in the target argillaceous rock sample is added together with the amount of calcium oxide (CaO) contained in the silicate minerals to obtain the second total amount of matter.

[0103] The chemical alteration index (CIA) of the target argillaceous rock sample is obtained by multiplying the ratio of the amount of aluminum oxide (Al2O3) in the target argillaceous rock sample to the sum of the amounts of the second substance and 100.

[0104] Specifically, this invention uses the Chemical Alteration Index (CIA) to determine the degree of chemical weathering in the target source area. The formula for calculating the Chemical Alteration Index (CIA) is shown in formula (2):

[0105] CIA=[Al2O3 / (Al2O3+CaO*+Na2O+K2O)]×100 (2)

[0106] In formula (2), each major element (Al2O3, K2O and Na2O) and CaO* refer to the amount of substance, and the unit is mole. CaO* refers to the CaO contained in the silicate minerals in the target argillaceous rock sample.

[0107] Since calcium oxide (CaO*) refers to the calcium oxide (CaO) contained in silicate minerals in the target argillaceous rock sample, the amount of calcium oxide (CaO) contained in silicate minerals in the target argillaceous rock sample must be determined before calculating the chemical alteration index (CIA).

[0108] For example, a target argillaceous rock sample contains 10, 3, 1, and 5 amounts of aluminum oxide (Al2O3), sodium oxide (Na2O), potassium oxide (K2O), and calcium oxide (CaO) contained in silicate minerals, respectively. Then, the total amount of Al2O3 + CaO* + Na2O + K2O, i.e., the second substance, is 10 + 3 + 1 + 5 = 19. The chemical alteration index (CIA) of this target argillaceous rock sample is 10 / 19 × 100 = 52.63.

[0109] In the above embodiments, by inputting the amount of multiple major elements of the target argillaceous rock sample into the calculation formula of the chemical alteration index (CIA), the chemical alteration index (CIA) of the target argillaceous rock sample can be obtained quickly and accurately, which is beneficial to improving the efficiency of determining the degree of chemical weathering.

[0110] In one or more optional embodiments of the present invention, the specific process for determining the amount of calcium oxide (CaO) contained in the silicate minerals of the target argillaceous rock sample can be as follows:

[0111] Determine the amount of calcium oxide (CaO) remaining in the target argillaceous rock sample after removing calcium oxide (CaO) from non-silicate minerals;

[0112] If the amount of the remaining calcium oxide (CaO) is less than the amount of sodium oxide (Na2O) in the target argillaceous rock sample, the amount of the remaining calcium oxide (CaO) shall be determined as the amount of calcium oxide (CaO) contained in the silicate minerals in the target argillaceous rock sample.

[0113] If the amount of the remaining calcium oxide (CaO) is greater than or equal to the amount of sodium oxide (Na2O) in the target argillaceous rock sample, the amount of sodium oxide (Na2O) in the target argillaceous rock sample shall be determined as the amount of calcium oxide (CaO) contained in the silicate minerals in the target argillaceous rock sample.

[0114] Specifically, when calculating the chemical alteration index (CIA), it is necessary to first remove the calcium oxide (CaO) contained in the non-silicate minerals in the target argillaceous rock sample to obtain the amount of remaining calcium oxide (CaO), which is expressed by the following formula (3):

[0115] CaO 剩余 =CaO-P2O5×10 / 3 (3)

[0116] In formula (3), CaO 剩余 The remaining CaO, CaO, and P2O5 are the CaO and P2O5 contained in the target argillaceous rock sample. 剩余 CaO and P2O5 both refer to the amount of substance, and their unit is mole.

[0117] Phosphorus pentoxide (P₂O₅) is also a major element. To simplify the processing, the amount of P₂O₅ in each initial argillaceous rock sample can be determined during the major element analysis, thus revealing the amount of P₂O₅ in the target argillaceous rock sample. Alternatively, after identifying the target argillaceous rock sample, the amount of P₂O₅ in that sample can be determined, avoiding the need to measure the amount of P₂O₅ in non-target argillaceous rock samples, thereby reducing data processing workload. The specific method for determining P₂O₅ is the same as that for aluminum oxide (Al₂O₃), calcium oxide (CaO), sodium oxide (Na₂O), potassium oxide (K₂O), iron oxide (Fe₂O₃), magnesium oxide (MgO), manganese oxide (MnO), and titanium dioxide (TiO₂), and will not be elaborated here.

[0118] After obtaining the amount of residual calcium oxide (CaO), the amount of residual CaO is compared with the amount of sodium oxide (Na₂O) in the target argillaceous rock sample. If the amount of residual CaO is less than the amount of sodium oxide (Na₂O), then the amount of residual CaO is determined as the amount of CaO contained in the silicate mineral. 剩余 <Na2O, let CaO* = CaO 剩余 If the amount of remaining calcium oxide (CaO) is greater than or equal to the amount of sodium oxide (Na₂O), then the amount of sodium oxide (Na₂O) is determined as the amount of calcium oxide (CaO) contained in the silicate mineral. That is, if CaO... 剩余 ≥Na2O, let CaO*=Na2O.

[0119] Since the amount of residual calcium oxide (CaO) obtained after removing CaO from non-silicate minerals in the target argillaceous rock sample may vary, determining the amount of calcium oxide (CaO) contained in silicate minerals based on the amount of residual calcium oxide (CaO) and sodium oxide (Na2O) can, to some extent, avoid the problem of excessive variation in the amount of residual calcium oxide (CaO) leading to inaccurate calculation results of the chemical alteration index (CIA).

[0120] In an optional embodiment of the present invention, after calculating the Chemical Alteration Index (CIA), the CIA of each target argillaceous rock sample can be directly compared with a quantitative analysis standard to obtain the degree of chemical weathering of the target source area. The quantitative analysis standard includes the correspondence between the CIA of the argillaceous rock and the degree of chemical weathering of the source area. Thus, without correcting the CIA, the amount of data processing is reduced, and the efficiency of determining the degree of chemical weathering can be improved.

[0121] In another optional embodiment of the present invention, due to the influence of potassium metasomatism during diagenesis, the calculated Chemical Alteration Index (CIA) may vary. Therefore, the CIA can be corrected first, and the degree of chemical weathering of the target source area can be determined based on the corrected CIA and quantitative analysis standards. That is, the specific implementation process of determining the degree of chemical weathering of the target source area based on the CIA can be as follows:

[0122] Using the A-CN-K triangle diagram or setting up a CIA corr. The formula is used to correct each of the chemical alteration indices (CIA) to obtain the corrected chemical alteration indices (CIA).

[0123] The corrected chemical alteration indices (CIAs) are compared with the quantitative analysis standard to obtain the degree of chemical weathering of the target source area. The quantitative analysis standard includes the correspondence between the chemical alteration index (CIA) of the argillaceous rock and the degree of chemical weathering of the source area.

[0124] Specifically, the A-CN-K triangle diagram is also known as the A-CN-K diagram, see [link / reference]. Figure 3 The diagram shown is one of the A-CN-K triangular diagrams provided by the present invention, wherein the solid line approximately parallel to the A-CN line is... and solid line Solid line represents the weathering trend of mudstone that has not undergone potassium metasomatism; This represents the transformation process of kaolinite (Ka) into illite (Il); solid line The figure represents the weathering trend of potassium metasomatism; dashed lines ③ and ④ represent the range of chemical alteration index (CIA) of argillaceous rocks that have undergone potassium metasomatism; solid lines ① and ② represent the range of chemical alteration index (CIA) before potassium metasomatism. In addition, the figure also marks potassium feldspar (Ksp), montmorillonite (Sm), plagioclase (Pl), gibbsite (Gi), and chlorite (Chl). A represents aluminum oxide (Al2O3), CN represents CaO*+Na2O, and K represents potassium oxide (K2O).

[0125] Set up CIA corr. The formula is also known as CIA. corr. The correction formula is shown in formula (4):

[0126]

[0127] Among them, the major elements (Al2O3, K2O and Na2O), CaO* and K2O corr. All refer to the amount of substance, and the unit is mole. CaO* refers to the CaO contained in the silicate minerals in the target argillaceous rock sample. Figure 3 In the middle, the solid line is approximately parallel to the line connecting A and CN. The intersection of the extended dashed line ⑤ and the CN-K coordinate axis is the m value, which represents the proportion of K2O in the parent rock; K2O corr. The calculated value is the K2O content in argillaceous rocks that have not undergone potassium metasomatism; CIA corr. The calculated value represents the CIA that has not undergone potassium replacement.

[0128] When using the A-CN-K trigonometric diagram for correction, Figure 3 Based on this, see Figure 4 The second A-CN-K triangular diagram provided by this invention, shown below, determines the projection point of each target argillaceous rock sample in the A-CN-K triangular coordinate system based on the amounts of aluminum oxide (Al₂O₃), calcium oxide (CaO), sodium oxide (Na₂O), and potassium oxide (K₂O) contained in the silicate minerals within the sample. This process is repeated for all target argillaceous rock samples, and the lines connecting the projection points of all target argillaceous rock samples in the A-CN-K triangular diagram are then used. The approximate parallelism of these lines to the solid lines is then considered. To determine whether the weathering products of the source rock underwent potassium replacement during diagenesis.

[0129] If approximately parallel, see Figure 4 center solid line The line connecting the five black circles in the vicinity indicates that the weathering products of the source rock did not undergo potassium replacement during the diagenesis process. For each target mudstone sample, the corrected chemical alteration index CIA (which is not affected by potassium replacement and does not require correction) is the chemical alteration index CIA calculated by formula (2).

[0130] If not approximately parallel, see Figure 4 center solid line The line connecting the five nearby black dots can be drawn by extending the line from the K-end to the black dots in the opposite direction and connecting it to the solid line indicating the weathering trend without potassium metasomatism. The intersection value represents the chemical alteration index (CIA) of the target mudstone sample before potassium alteration, i.e., the corrected chemical alteration index (CIA).

[0131] Furthermore, after obtaining the corrected Chemical Alteration Index (CIA), the CIA was compared with quantitative analysis standards to ultimately determine the degree of chemical weathering in the target source area. The quantitative analysis standards for determining the degree of chemical weathering in the source area of ​​argillaceous rocks are: CIA = 50–60, reflecting a weak degree of chemical weathering; CIA = 60–80, reflecting a moderate degree of chemical weathering; and CIA = 80–100, reflecting a strong degree of chemical weathering.

[0132] Thus, by correcting the chemical alteration index (CIA), the influence of potassium metasomatism during diagenesis on the CIA can be eliminated, thereby improving the accuracy of the CIA and consequently enhancing the accuracy and reliability of determining the degree of chemical weathering.

[0133] Furthermore, since initial argillaceous rock samples with an ICV greater than or equal to a set threshold did not undergo recycle, these samples can also be identified as target argillaceous rock samples. That is, before calculating the Chemical Alteration Index (CIA) of each target argillaceous rock sample, the following steps are also included:

[0134] For any initial argillaceous rock sample, if the compositional variation index (ICV) of the initial argillaceous rock sample is greater than or equal to a set threshold, the initial argillaceous rock sample is determined as the target argillaceous rock sample.

[0135] Specifically, for initial argillaceous rock samples with an ICV greater than or equal to a set threshold, it indicates that the initial argillaceous rock samples are immature and contain a high level of non-clay silicate minerals, belonging to the first deposition under tectonic activity. Selecting initial argillaceous rock samples with an ICV greater than or equal to a set threshold as target argillaceous rock samples can also eliminate the influence of recycle and further weathering in the depositional zone on the calculation of the chemical alteration index (CIA), while increasing the sample size, which is beneficial to improving the reliability and accuracy of the determined chemical weathering degree.

[0136] The following is combined with Figure 5 The method for determining the degree of chemical weathering in the source region provided by this invention will be further described below. Figure 5 This is the second flowchart illustrating the method for determining the degree of chemical weathering in a source region provided by this invention:

[0137] Step 502: Select mudstone as the research object and exclude sedimentary differentiation.

[0138] Specifically, obtaining multiple initial mudstone samples from the target source area can eliminate the influence of sedimentary differentiation on the calculation of the chemical alteration index (CIA).

[0139] Step 504: Major element determination was performed on the mudstone sample to obtain the mass percentages of Al2O3, CaO, Na2O, K2O, Fe2O3, MgO, MnO, and TiO2.

[0140] Specifically, the major elements of the argillaceous rock samples were determined using X-ray fluorescence spectrometry (XRF) to obtain the mass percentages of Al2O3, CaO, Na2O, K2O, Fe2O3, MgO, MnO, and TiO2.

[0141] Step 506: Select samples with ICV≥1 (belonging to the first deposition) to exclude recycle and further weathering in the depositional area.

[0142] Specifically, the mass percentages of Al2O3, CaO, Na2O, K2O, Fe2O3, MgO, MnO, and TiO2 are converted into amounts of substance. Then, based on the amounts of substance of Al2O3, CaO, Na2O, K2O, Fe2O3, MgO, MnO, and TiO2, the compositional variation index (ICV) of each initial mudstone sample is calculated. The initial mudstone sample with an ICV ≥ 1 is used as the target mudstone sample, which can eliminate the influence of recycle and further weathering in the depositional zone.

[0143] Step 508: Select samples with ICV < 1 and no recycle, excluding recycle and further weathering in the depositional zone.

[0144] Specifically, the mass percentages of Al2O3, CaO, Na2O, K2O, Fe2O3, MgO, MnO, and TiO2 are converted into amounts of substance. Then, based on the amounts of substance of Al2O3, CaO, Na2O, K2O, Fe2O3, MgO, MnO, and TiO2, the compositional variation index (ICV) of each initial mudstone sample is calculated. Initial mudstone samples with an ICV < 1 and no recycle are selected as target mudstone samples, thus excluding the influence of recycle and further weathering in the depositional zone.

[0145] It should be noted that steps 506 and 508 can be performed simultaneously or in a specific order; the present invention does not limit this.

[0146] Step 510: Calculate the CIA according to the chemical alteration index calculation formula.

[0147] Specifically, the chemical alteration index (CIA) of each target argillaceous rock sample is calculated according to the formula for calculating the chemical alteration index (CIA).

[0148] Step 512: Using the A-CN-K triangle diagram or CIA corr. Calculation formula to correct for potassium metasomatism during diagenesis.

[0149] Specifically, the A-CN-K triangle diagram or CIA can be used. corr. Two methods were used to correct the chemical alteration index (CIA) using calculation formulas, resulting in the corrected CIA. corr. .

[0150] Step 514: Corrected CIA corr. By comparing with the criteria for identifying mudstone, the degree of chemical weathering in the source area can be quantitatively determined.

[0151] Specifically, the corrected CIA corr. The degree of chemical weathering in the target source area is determined by comparing it with quantitative analysis standards.

[0152] The above embodiments, after excluding the influence of sedimentary differentiation, recycle, further weathering in the sedimentary zone, and potassium metasomatism during diagenesis, calculate the corrected chemical alteration index (CIA) using the amount of major elements in the target argillaceous rock sample. This CIA is then compared with the quantitative analysis standard for determining the degree of chemical weathering in the source area of ​​argillaceous rocks, ultimately determining the degree of chemical weathering in the target source area, thus improving the accuracy and reliability of the degree of chemical weathering.

[0153] The apparatus for determining the degree of chemical weathering in a source region provided by the present invention will be described below. The apparatus for determining the degree of chemical weathering in a source region described below can be referred to in correspondence with the method for determining the degree of chemical weathering in a source region described above.

[0154] Figure 6 This is a schematic diagram of the device for determining the degree of chemical weathering in a source region provided by the present invention, as shown below. Figure 6 As shown, the device 600 for determining the degree of chemical weathering in a source area includes: an acquisition module 601, a judgment module 602, a determination module 603, and a calculation module 604, wherein:

[0155] Acquisition module 601 is configured to acquire at least one initial argillaceous rock sample from the target source region;

[0156] The judgment module 602 is configured to determine whether the initial argillaceous rock sample has undergone recycle if the composition variation index (ICV) of the initial argillaceous rock sample is less than a set threshold.

[0157] The determination module 603 is configured to determine the initial argillaceous rock sample that has not undergone recycle as the target argillaceous rock sample;

[0158] The calculation module 604 is configured to calculate the chemical alteration index (CIA) of each target mudstone sample and determine the degree of chemical weathering of the target source area based on each chemical alteration index (CIA).

[0159] The apparatus for determining the degree of chemical weathering in a source area provided by this invention obtains at least one initial argillaceous rock sample from the target source area. This means that the argillaceous rock from the target source area is used as the sample, allowing for sedimentary differentiation during transport and deposition, thus eliminating the influence of sedimentary differentiation on the calculation of the chemical alteration index. By identifying initial argillaceous rock samples with an ICV (Index of Compositional Variation) less than a set threshold and without recycle, the influence of recycle and further weathering in the depositional zone on the calculation of the chemical alteration index is eliminated. Furthermore, by excluding sedimentary differentiation, recycle, and further weathering in the depositional zone, the chemical alteration index (CIA) of each target argillaceous rock sample is calculated, improving the accuracy of the CIA. This makes the determination of the degree of chemical weathering in the target source area based on the CIA more accurate and reliable.

[0160] Optionally, the device further includes a trace element determination module, configured to perform trace element determination on each initial argillaceous rock sample to obtain the amount of substance of each trace element in each initial argillaceous rock sample, wherein the trace elements include at least thorium (Th), scandium (Sc), and zirconium (Zr).

[0161] Accordingly, the judgment module 602 is further configured to determine the target point of the initial argillaceous rock sample mapped onto the recycle discrimination map based on the amount of each trace element, wherein the horizontal axis of the recycle discrimination map is Zr / Sc and the vertical axis is Th / Sc; if the target point is located on the trend line of the source region composition change in the recycle discrimination map, then it is determined that the initial argillaceous rock sample has not undergone recycle.

[0162] Optionally, the device further includes a major element determination module, configured to perform major element determination on each initial argillaceous rock sample to obtain the amount of each major element in each initial argillaceous rock sample, wherein the major elements include at least Al2O3, CaO, Na2O, K2O, Fe2O3, MgO, MnO and TiO2; and calculate the composition variation index (ICV) of each initial argillaceous rock sample based on the amount of each major element.

[0163] Optionally, the major element determination module is further configured to, for any initial argillaceous rock sample, add the amounts of CaO, Na2O, K2O, Fe2O3, MgO, MnO, and TiO2 in the initial argillaceous rock sample to obtain a first total amount of matter; and determine the ratio of the first total amount of matter to the amount of Al2O3 in the initial argillaceous rock sample as the composition variation index (ICV) of the initial argillaceous rock sample.

[0164] Optionally, the calculation module 604 is further configured to, for any target argillaceous rock sample, determine the amount of CaO contained in the silicate minerals of the target argillaceous rock sample; add the amounts of Al2O3, Na2O, and K2O in the target argillaceous rock sample and the amount of CaO contained in the silicate minerals to obtain a second total amount of matter; and multiply the ratio of the amount of Al2O3 in the target argillaceous rock sample to the second total amount of matter by 100 to obtain the chemical alteration index (CIA) of the target argillaceous rock sample.

[0165] Optionally, the calculation module 604 is further configured to determine the amount of remaining CaO in the target argillaceous rock sample after removing CaO from non-silicate minerals; if the amount of remaining CaO is less than the amount of Na2O in the target argillaceous rock sample, the amount of remaining CaO is determined as the amount of CaO contained in the silicate minerals of the target argillaceous rock sample; if the amount of remaining CaO is greater than or equal to the amount of Na2O in the target argillaceous rock sample, the amount of Na2O in the target argillaceous rock sample is determined as the amount of CaO contained in the silicate minerals of the target argillaceous rock sample.

[0166] Optionally, the calculation module 604 is further configured to utilize the A-CN-K triangulation or set a CIA. corr. The formula is used to correct each of the chemical alteration indices (CIAs) to obtain the corrected CIAs. The corrected CIAs are then compared with the quantitative analysis standard to obtain the degree of chemical weathering of the target source area. The quantitative analysis standard includes the correspondence between the CIA of the mudstone and the degree of chemical weathering of the source area.

[0167] Optionally, the determining module 603 is further configured to determine the initial argillaceous rock sample as the target argillaceous rock sample if the compositional variation index (ICV) of the initial argillaceous rock sample is greater than or equal to a set threshold.

[0168] Figure 7 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 7As shown, the electronic device may include a processor 710, a communication interface 720, a memory 730, and a communication bus 740, wherein the processor 710, the communication interface 720, and the memory 730 communicate with each other via the communication bus 740. The processor 710 can call logical instructions in the memory 730 to execute a method for determining the degree of chemical weathering in a source area. The method includes: acquiring at least one initial argillaceous rock sample from a target source area; for any initial argillaceous rock sample, if the compositional variation index (ICV) of the initial argillaceous rock sample is less than a set threshold, determining whether the initial argillaceous rock sample has undergone recycle; identifying the initial argillaceous rock sample that has not undergone recycle as a target argillaceous rock sample; calculating the chemical alteration index (CIA) of each target argillaceous rock sample, and determining the degree of chemical weathering in the target source area based on each chemical alteration index (CIA).

[0169] Furthermore, the logical instructions in the aforementioned memory 730 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0170] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the methods provided above for determining the degree of chemical weathering in a source area. The method includes: acquiring at least one initial argillaceous rock sample from a target source area; determining whether the initial argillaceous rock sample has undergone recycle if the compositional variation index (ICV) of the initial argillaceous rock sample is less than a set threshold; identifying the initial argillaceous rock sample that has not undergone recycle as a target argillaceous rock sample; calculating the chemical alteration index (CIA) of each target argillaceous rock sample, and determining the degree of chemical weathering in the target source area based on each chemical alteration index (CIA).

[0171] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When executed by a processor, the computer program implements a method for determining the degree of chemical weathering of a source area provided by the methods described above. The method includes: acquiring at least one initial argillaceous rock sample from a target source area; determining, for any initial argillaceous rock sample, whether the initial argillaceous rock sample has undergone recycle if the compositional variation index (ICV) of the initial argillaceous rock sample is less than a set threshold; identifying the initial argillaceous rock sample that has not undergone recycle as a target argillaceous rock sample; calculating the chemical alteration index (CIA) of each target argillaceous rock sample, and determining the degree of chemical weathering of the target source area based on each chemical alteration index (CIA).

[0172] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0173] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0174] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for determining the degree of chemical weathering in a source region, characterized in that, include: Obtain at least one initial argillaceous rock sample from the target source region; For any initial argillaceous rock sample, if the compositional variation index (ICV) of the initial argillaceous rock sample is less than a set threshold, it is determined whether the initial argillaceous rock sample has undergone recycle. The determination of whether recycle has occurred is made by mapping the initial argillaceous rock sample onto a recycle discrimination diagram with Zr / Sc as the abscissa and Th / Sc as the ordinate. If the target point of the mapping is located on the compositional variation trend line of the source area, it is determined that no recycle has occurred. The initial argillaceous rock sample that did not undergo recycle was identified as the target argillaceous rock sample; Calculate the chemical alteration index (CIA) of each target argillaceous rock sample, and determine the degree of chemical weathering of the target source area based on each CIA.

2. The method for determining the degree of chemical weathering in a source region according to claim 1, characterized in that, Before determining whether the initial argillaceous rock sample has undergone recycle, the method further includes: Trace element analysis was performed on each initial argillaceous rock sample to obtain the amount of each trace element in each initial argillaceous rock sample, wherein the trace elements include at least thorium (Th), scandium (Sc), and zirconium (Zr). Accordingly, determining whether the initial argillaceous rock sample has undergone recycle includes: Based on the amount of each trace element, the target point of the initial mudstone sample is determined on the recycle discrimination map, where the horizontal axis of the recycle discrimination map is Zr / Sc and the vertical axis is Th / Sc. If the target point is located on the trend line of source region composition change in the recycle discrimination diagram, then it is determined that the initial mudstone sample has not undergone recycle.

3. The method for determining the degree of chemical weathering in a source region according to claim 1, characterized in that, Before determining whether the initial argillaceous rock sample has undergone recycle when the compositional variation index (ICV) of the initial argillaceous rock sample is less than a set threshold, the method further includes: Major element determination was performed on each initial argillaceous rock sample to obtain the amount of substance of each major element in each initial argillaceous rock sample. The major elements include at least Al2O3, CaO, Na2O, K2O, Fe2O3, MgO, MnO and TiO2. The compositional variation index (ICV) of each initial argillaceous rock sample was calculated based on the amount of each major element.

4. The method for determining the degree of chemical weathering in the source region according to claim 3, characterized in that, The calculation of the compositional variation index (ICV) of each initial argillaceous rock sample based on the amount of each major element includes: For any initial argillaceous rock sample, the amounts of CaO, Na2O, K2O, Fe2O3, MgO, MnO, and TiO2 in the initial argillaceous rock sample are added together to obtain the first total amount of matter. The ratio of the total amount of the first substance to the amount of Al2O3 in the initial argillaceous rock sample is determined as the compositional variation index (ICV) of the initial argillaceous rock sample.

5. The method for determining the degree of chemical weathering in the source region according to claim 3, characterized in that, The calculation of the chemical alteration index (CIA) for each target argillaceous rock sample includes: For any given target argillaceous rock sample, determine the amount of CaO contained in the silicate minerals within the target argillaceous rock sample; The amounts of Al2O3, Na2O, and K2O in the target argillaceous rock sample, and the amount of CaO contained in the silicate minerals, are added together to obtain the second total amount of matter. The chemical alteration index (CIA) of the target argillaceous rock sample is obtained by multiplying the ratio of the amount of Al2O3 in the target argillaceous rock sample to the sum of the amounts of the second substance and 100.

6. The method for determining the degree of chemical weathering in the source region according to claim 5, characterized in that, Determining the amount of CaO contained in silicate minerals in the target argillaceous rock sample includes: Determine the amount of CaO remaining in the target argillaceous rock sample after removing CaO from non-silicate minerals; If the amount of remaining CaO is less than the amount of Na2O in the target argillaceous rock sample, the amount of remaining CaO shall be determined as the amount of CaO contained in the silicate minerals in the target argillaceous rock sample. If the amount of remaining CaO is greater than or equal to the amount of Na2O in the target argillaceous rock sample, the amount of Na2O in the target argillaceous rock sample shall be determined as the amount of CaO contained in the silicate minerals of the target argillaceous rock sample.

7. The method for determining the degree of chemical weathering in a source region according to claim 1, characterized in that, The determination of the chemical weathering degree of the target source region based on each Chemical Alteration Index (CIA) includes: Using the A-CN-K triangle diagram or setting up a CIA corr. The formula is used to correct each of the chemical alteration indices (CIA) to obtain the corrected chemical alteration indices (CIA). The corrected chemical alteration indices (CIAs) are compared with the quantitative analysis standard to obtain the degree of chemical weathering of the target source area. The quantitative analysis standard includes the correspondence between the chemical alteration index (CIA) of the argillaceous rock and the degree of chemical weathering of the source area.

8. The method for determining the degree of chemical weathering in a source region according to any one of claims 1-7, characterized in that, Before calculating the chemical alteration index (CIA) of each target argillaceous rock sample, the following steps are also included: For any initial argillaceous rock sample, if the compositional variation index (ICV) of the initial argillaceous rock sample is greater than or equal to a set threshold, the initial argillaceous rock sample is determined as the target argillaceous rock sample.

9. An apparatus for determining the degree of chemical weathering in a source region, characterized in that, include: The acquisition module is configured to acquire at least one initial argillaceous rock sample from the target source region; The judgment module is configured to determine whether a recycle has occurred for any initial argillaceous rock sample if the compositional variation index (ICV) of the initial argillaceous rock sample is less than a set threshold. The determination of whether a recycle has occurred is made by mapping the initial argillaceous rock sample onto a recycle discrimination diagram with Zr / Sc as the abscissa and Th / Sc as the ordinate. If the mapped target point is located on the compositional variation trend line of the source area, it is determined that no recycle has occurred. The determination module is configured to identify the initial argillaceous rock sample that has not undergone recycle as the target argillaceous rock sample; The calculation module is configured to calculate the chemical alteration index (CIA) of each target mudstone sample and determine the degree of chemical weathering of the target source area based on each CIA.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the method for determining the degree of chemical weathering of the source region as described in any one of claims 1 to 8.

11. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method for determining the degree of chemical weathering of the source region as described in any one of claims 1 to 8.

12. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the method for determining the degree of chemical weathering of the source region as described in any one of claims 1 to 8.

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