A method for rapid identification of strontium-rich strata and strontium-rich minerals in karst areas

Abstract

The present invention provides a method for rapidly identifying strontium-rich strata and strontium-rich minerals in karst areas, including: determining the distribution of strontium-rich groundwater systems in target karst areas, determining the stratum types and spatial distribution characteristics of strontium-rich groundwater systems, selecting typical stratigraphic sections that can cover all strata of strontium-rich groundwater systems, performing strontium element scanning based on typical stratigraphic sections, determining strontium-rich strata and collecting rock samples of strontium-rich strata, testing the collected rock samples for strontium-rich minerals and their contents, and determining the types of strontium-rich minerals. The method for rapidly identifying strontium-rich strata and strontium-rich minerals in karst areas provided by the present invention is based on hydrogeological maps, and uses field scanning and indoor precision testing and other means for karst water samples and rock samples within a certain area to achieve the identification of strontium-rich areas, strontium-rich strata, and strontium-rich minerals within a certain area, thereby achieving the purpose of accurate prospecting.

Description

Technical Field

[0001] The invention relates to the technical field of karst geological exploration, and in particular to a method for quickly identifying strontium-rich strata and strontium-rich minerals in a karst area. Background Art

[0002] Strontium (Sr) is an important non-metallic mineral resource, widely used in electronics, medicine, metallurgy and other fields. Due to its special geological structure, the karst area, such as the long-term dissolution and sedimentation of soluble rocks such as limestone and dolomite, has formed rich strontium ore resources. However, traditional strontium resource exploration methods mainly rely on geological mapping, surface sample collection and deep drilling. These methods often have problems such as poor systematicity, low pertinence, long time consumption, high cost, and great damage to the environment. Therefore, it is very necessary to design a rapid, economical and environmentally friendly method for the rapid identification of strontium-rich strata and strontium-rich minerals in karst areas. Summary of the invention

[0003] The purpose of the present invention is to provide a method for quickly identifying strontium-rich strata and strontium-rich minerals in karst areas, which can improve exploration efficiency, reduce exploration costs, reduce environmental damage, and improve identification accuracy. The method has the advantages of simple operation, strong applicability, high environmental protection, and high real-time performance.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] A method for quickly identifying strontium-rich strata and strontium-rich minerals in a karst area comprises the following steps:

[0006] Step 1: Determine the distribution of strontium-rich groundwater systems in the target karst area;

[0007] Step 2: Determine the stratigraphic type and spatial distribution characteristics of the strontium-rich groundwater system;

[0008] Step 3: Select a typical stratigraphic section that can cover all strata of the strontium-rich groundwater system;

[0009] Step 4: Based on the typical stratigraphic section, conduct strontium element scanning to determine the strontium-rich layer and collect rock samples from the strontium-rich layer;

[0010] Step 5: Test the collected rock samples for strontium-rich minerals and their content to determine the type of strontium-rich minerals and ultimately achieve the goal of accurate mineral prospecting.

[0011] Optionally, in step 1, the distribution of strontium-rich groundwater system in the target karst area is determined, specifically:

[0012] Based on the hydrogeological survey of the target karst area, strontium content tests were carried out on the main underground rivers, karst springs, skylights, karst pools, boreholes and other water points within the target karst area. Water points with strontium content ≥ 0.2 mg / L were regarded as strontium-rich water points, and groundwater systems in which the proportion of strontium-rich water points exceeded the preset threshold were regarded as strontium-rich groundwater systems. All strontium-rich groundwater systems in the target karst area were delineated, and the distribution of strontium-rich groundwater systems in the target karst area was determined.

[0013] Optionally, the preset threshold is 50%.

[0014] Optionally, in step 2, the stratigraphic type and spatial distribution characteristics of the strontium-rich groundwater system are determined, specifically:

[0015] For a certain strontium-rich groundwater system, based on its geological and hydrogeological survey data, the stratigraphic types and spatial distribution characteristics within the system are sorted out, the main stratigraphic layers are identified, and the operation is repeated to determine the stratigraphic types and spatial distribution characteristics of all strontium-rich groundwater systems.

[0016] Optionally, in step 3, a typical stratigraphic section that can cover all strata of the strontium-rich groundwater system is selected, specifically:

[0017] For a certain strontium-rich groundwater system, obtain its hydrogeological map data, and based on the hydrogeological map data, delineate the typical stratigraphic sections that can cover all strata within the system. Repeat the operation to determine the typical stratigraphic sections of all strontium-rich groundwater systems in the target karst area.

[0018] Optionally, there are one or more typical stratigraphic sections, and the typical stratigraphic sections are distributed along the road, and the rocks are well exposed.

[0019] Optionally, in step 4, based on a typical stratigraphic section, a strontium element scan is performed to determine the strontium-rich layer and collect rock samples from the strontium-rich layer, specifically:

[0020] Based on typical stratigraphic profiles, XRF heavy metal analyzers were used to carry out strontium element scanning in accordance with the principle of covering all strata at equal intervals. Tests were intensified at stratum boundaries and rock type mutations to determine strontium-rich strata and collect rock samples from strontium-rich strata, with an interval of 50-100m.

[0021] Optionally, the diameter of the rock sample is greater than or equal to 5 cm, the weight is greater than or equal to 1 kg, and the rock sample is a rock sample with a fresh rock surface.

[0022] Optionally, in step 5, the collected rock samples are tested for strontium-rich minerals and their content to determine the type of strontium-rich minerals, specifically:

[0023] After the collected rock samples were initially tested based on thin section identification, they were further precisely tested using scanning electron microscopy and energy spectrum testing to test strontium-rich minerals and their content and determine the types of strontium-rich minerals.

[0024] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects: the method for rapid identification of strontium-rich strata and strontium-rich minerals in karst areas provided by the present invention comprises determining the distribution of strontium-rich groundwater systems in target karst areas, determining the stratum types and spatial distribution characteristics of the strontium-rich groundwater systems, selecting typical stratigraphic profiles that can cover all strata of the strontium-rich groundwater systems, performing strontium element scanning based on the typical stratigraphic profiles, determining strontium-rich strata and collecting rock samples of the strontium-rich strata, testing the collected rock samples for strontium-rich minerals and their contents, determining the types of strontium-rich minerals, and ultimately achieving the purpose of accurate prospecting; the method can realize rapid identification of strontium-rich strata and strontium-rich minerals in karst areas, and compared with traditional strontium resource exploration that relies on a large amount of drilling and sample analysis, it can improve exploration efficiency, reduce exploration costs, reduce environmental damage, and improve identification accuracy, and has the advantages of simple operation, strong applicability, high environmental protection, and high real-time performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The figure is a schematic flow chart of a method for rapidly identifying strontium-rich strata and strontium-rich minerals in a karst area according to an embodiment of the present invention;

[0026] Figure 2 This is a distribution map of the strontium-rich groundwater system in the Tapang River Basin in an embodiment of the present invention;

[0027] Figure 3 This is a stratigraphic distribution diagram of a typical strontium-rich groundwater system (Longtankou underground river system) in an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the scanning electron microscope test results of the T2g2-18 layer of a typical strontium-rich groundwater system (Longtankou underground river system) in an embodiment of the present invention;

[0029] Figure 5 It is a schematic diagram of the test results of the T2g2-18 layer potential spectrum of a typical strontium-rich groundwater system (Longtankou underground river system) in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The purpose of the present invention is to provide a method for rapid identification of strontium-rich strata and strontium-rich minerals in karst areas, which can realize rapid identification of strontium-rich strata and strontium-rich minerals in karst areas and provide basic data for the development, utilization and protection of strontium resources in karst areas.

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] like Figure 1 As shown, the method for quickly identifying strontium-rich strata and strontium-rich minerals in karst areas provided by the embodiment of the present invention comprises the following steps:

[0033] Step 1: Determine the distribution of strontium-rich groundwater systems in the target karst area;

[0034] Step 2: Determine the stratigraphic type and spatial distribution characteristics of the strontium-rich groundwater system;

[0035] Step 3: Select a typical stratigraphic section that can cover all strata of the strontium-rich groundwater system;

[0036] Step 4: Based on the typical stratigraphic section, conduct strontium element scanning, determine the strontium-rich layer and collect rock samples;

[0037] Step 5: Test the collected rock samples for strontium-rich minerals and their content to determine the type of strontium-rich minerals.

[0038] In step 1, the distribution of strontium-rich groundwater systems in the target karst area is determined, specifically:

[0039] Based on the hydrogeological survey of the target karst area, strontium content tests were carried out on the main underground rivers, karst springs, skylights, karst pools, boreholes and other water points within the target karst area. Water points with strontium content ≥ 0.2 mg / L were regarded as strontium-rich water points, and groundwater systems in which the proportion of strontium-rich water points exceeded the preset threshold were regarded as strontium-rich groundwater systems. All strontium-rich groundwater systems in the target karst area were delineated, and the distribution of strontium-rich groundwater systems in the target karst area was determined.

[0040] The preset threshold is 50%.

[0041] In step 2, the stratigraphic type and spatial distribution characteristics of the strontium-rich groundwater system are determined, specifically:

[0042] For a certain strontium-rich groundwater system, based on its geological and hydrogeological survey data, the stratigraphic types and spatial distribution characteristics within the system are sorted out, the main stratigraphic layers are identified, and the operation is repeated to determine the stratigraphic types and spatial distribution characteristics of all strontium-rich groundwater systems.

[0043] In step 3, a typical stratigraphic section that can cover all strata of the strontium-rich groundwater system is selected, specifically:

[0044] For a certain strontium-rich groundwater system, its hydrogeological map data is obtained, and based on the hydrogeological map data, the typical stratigraphic profile that can cover all strata within the groundwater system is delineated. The operation is repeated to determine the typical stratigraphic profiles of all strontium-rich groundwater systems in the target karst area.

[0045] The typical stratigraphic sections include one or more, not limited to one, and the typical stratigraphic sections are distributed along the road, and the rocks are well exposed, so as to facilitate subsequent on-site investigation and rock strontium content testing.

[0046] In step 4, based on the typical stratigraphic profile, strontium element scanning is performed to determine the strontium-rich layer and collect rock samples from the strontium-rich layer, specifically:

[0047] Based on typical stratigraphic profiles, XRF heavy metal analyzers are used to carry out strontium element scanning in accordance with the principle of covering all strata with equal spacing. Tests are intensified at stratum boundaries and rock type mutations to determine strontium-rich strata and collect rock samples from strontium-rich strata. The spacing is 50-100m, which can be further reduced or increased in local areas according to actual conditions.

[0048] The diameter of the rock sample is greater than or equal to 5 cm, the weight is greater than or equal to 1 kg, and the rock sample is a rock sample with a fresh rock surface.

[0049] In step 5, the collected rock samples are tested for strontium-rich minerals and their content to determine the type of strontium-rich minerals, specifically:

[0050] After the collected rock samples were initially tested based on thin section identification, they were further precisely tested using scanning electron microscopy and energy spectrum testing to test strontium-rich minerals and their content and determine the types of strontium-rich minerals.

[0051] The present invention provides an embodiment to introduce the method described in detail:

[0052] In step 1, the distribution of strontium-rich groundwater systems in the target karst area is determined, specifically:

[0053] Taking the Dabang River Basin in Guizhou as an example, based on the 1:50,000 karst hydrogeological survey, strontium content tests were carried out on major underground rivers, karst springs, skylights, karst pools, boreholes and other water points within the basin. Water points with strontium content ≥ 0.2 mg / L were regarded as strontium-rich water points, and karst groundwater systems with strontium-rich water points accounting for more than 50% were regarded as strontium-rich groundwater systems. All strontium-rich groundwater systems in the basin were identified, totaling 10, and the distribution of strontium-rich groundwater systems in the Dabang River Basin was determined.

[0054] In step 2, the stratigraphic type and spatial distribution characteristics of the strontium-rich groundwater system are determined, specifically:

[0055] Taking the Longtankou strontium-rich underground river system in the Dabang River Basin as an example, based on its geological and hydrogeological survey data, the stratigraphic types and spatial distribution characteristics within the system were sorted out, and the main strata within the system were identified as follows: the Yelang Formation (T1y) of the Lower Triassic, which is a thin to medium-thick layer of silt conglomerate mudstone limestone with undeveloped karst, mainly distributed in the west and northwest of the system; the first and second members of the Jialingjiang Formation of the Lower Triassic (T1j 1+2 ), the lithology is yellow-green sandy claystone interbedded with dark gray medium-thick mudstone, karst is relatively developed, mainly distributed in the northwest of the system; the third and fourth members of the Jialingjiang Formation of the Lower Triassic (T1j 3+4 ), the lithology is gray medium-thick to massive limestone and dolomitic limestone, which is distributed in the northwest of the system in a strip-like manner; the first member of the Guanling Formation of the Middle Triassic (T2g 1 ), the lithology is gray medium-thick mud dolomite interbedded with variegated claystone, karst is not developed, and is distributed in strips in the west and middle of the system; the second member of the Guanling Formation of the Middle Triassic (T2g 2 ), the lithology is gray medium-thick micrite limestone and brecciated dolomite, with developed karst, mainly distributed in the middle and eastern parts of the system; the first member of the Yangliujing Formation of the Middle Triassic (T2y 1 ), the lithology is light grey medium-thick layered dolomite and limestone, with relatively developed karst, mainly distributed in the southeast of the system. Repeat the operation to determine the stratigraphic type and spatial distribution characteristics of the other nine strontium-rich groundwater systems in the Tapang River Basin.

[0056] In step 3, a typical stratigraphic section that can cover all strata of the strontium-rich groundwater system is selected, specifically:

[0057] Taking the Longtankou strontium-rich underground river system in the Tapang River Basin as an example, a 1:50,000 hydrogeological map of the system was obtained. Based on the hydrogeological map, all strata (T1y, T1j, T2y, T3y, T4y, T5y, T6y, T7y, T8y, T9y, T10y, T11y, T12y, T13y, T14y, T15y, 1+2 、T1j 3+4 、T2g 1 、T2g 2 、T2y 1 ) of the typical stratigraphic section AA′( Figure 3 ), and the stratigraphic profile is distributed along the road, with good rock exposure, which is convenient for subsequent on-site investigation and rock strontium content testing. Repeat the operation to determine the stratigraphic type and spatial distribution characteristics of the other nine strontium-rich groundwater systems in the Tapang River Basin.

[0058] In step 4, based on the typical stratigraphic profile, strontium element scanning is performed to determine the strontium-rich layer and collect rock samples from the strontium-rich layer, specifically:

[0059] Taking the Longtankou strontium-rich underground river system in the Tapang River Basin as an example, based on the typical stratigraphic profile AA′, the XRF heavy metal analyzer was used to carry out strontium element scanning in accordance with the principle of covering all strata with an equal interval of 50m. The test was intensified at the stratum boundary and the lithology mutation point. The test results are shown in Table 1. Finally, T1y-1, T 1-2 j 1+2 -2, T 1-2 j 3+4 -1, T2g 2 -4, T2g 2 -5, T2g 2 -11, T2g 2 -16, T2g 2 -18, T2g 2 -19 and other 9 layers have strontium contents greater than 900 mg / kg, which are strontium-rich layers. Rock samples from the strontium-rich layers were collected, and a total of 9 groups were collected. The samples were greater than 5 cm in diameter, greater than 1 kg in weight, and had fresh rock surfaces.

[0060] In step 5, the collected rock samples are tested for strontium-rich minerals and their content to determine the type of strontium-rich minerals, specifically:

[0061] Taking the Longtankou strontium-rich underground river system in the Tapang River Basin as an example, the 9 groups of rock samples collected were first identified by thin sections, and then the rock samples were precisely tested by scanning electron microscopy and energy spectrum testing to achieve strontium-rich minerals and content testing ( Figure 4 , Figure 5 ), it was determined that the strontium-rich mineral type was celestite, of which 4 groups had celestite contents greater than 1% and 5 groups had celestite contents less than 1%.

[0062] Table 1 Sr element scanning results of AA′ stratigraphic section of Longtankou underground river system

[0063]

[0064]

[0065] The invention provides a method for rapidly identifying strontium-rich strata and strontium-rich minerals in a karst area. The method comprises determining the distribution of a strontium-rich groundwater system in a target karst area, determining the stratum type and spatial distribution characteristics of the strontium-rich groundwater system, selecting a typical stratigraphic profile that can cover all strata of the strontium-rich groundwater system, performing strontium element scanning based on the typical stratigraphic profile, determining strontium-rich strata and collecting rock samples of the strontium-rich strata, and testing the collected rock samples for strontium-rich minerals and their contents to determine the types of strontium-rich minerals. The method can realize rapid identification of strontium-rich strata and strontium-rich minerals in a karst area, and compared with traditional strontium resource exploration that relies on a large amount of drilling and sample analysis, it can improve exploration efficiency, reduce exploration costs, reduce environmental damage, and improve identification accuracy, and has the advantages of simple operation, strong applicability, high environmental protection, and high real-time performance.

[0066] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for quickly identifying strontium-rich strata and strontium-rich minerals in karst areas, characterized in that: The steps include: Step 1: Determine the distribution of strontium-rich groundwater systems in the target karst area; Step 2: Determine the stratigraphic type and spatial distribution characteristics of the strontium-rich groundwater system; Step 3: Select a typical stratigraphic section that can cover all strata of the strontium-rich groundwater system; Step 4: Based on the typical stratigraphic section, conduct strontium element scanning to determine the strontium-rich layer and collect rock samples from the strontium-rich layer; Step 5: Test the collected rock samples for strontium-rich minerals and their content to determine the type of strontium-rich minerals, ultimately achieving the goal of accurate mineral prospecting; In step 1, the distribution of strontium-rich groundwater systems in the target karst area is determined, specifically: Based on the hydrogeological survey of the target karst area, strontium content tests were carried out on the main underground rivers, karst springs, skylights, karst pools, and borehole water points within the target karst area. Water points with strontium content ≥ 0.2 mg / L were regarded as strontium-rich water points, and groundwater systems in which the proportion of strontium-rich water points exceeded the preset threshold were regarded as strontium-rich groundwater systems. All strontium-rich groundwater systems in the target karst area were delineated, and the distribution of strontium-rich groundwater systems in the target karst area was determined.

2. The method for rapid identification of strontium-rich strata and strontium-rich minerals in karst areas according to claim 1, characterized in that: The preset threshold is 50%.

3. The method for rapid identification of strontium-rich strata and strontium-rich minerals in karst areas according to claim 1, characterized in that: In step 2, the stratigraphic type and spatial distribution characteristics of the strontium-rich groundwater system are determined, specifically: For a certain strontium-rich groundwater system, based on its geological and hydrogeological survey data, the stratigraphic types and spatial distribution characteristics within the system are sorted out, the main stratigraphic layers are identified, and the operation is repeated to determine the stratigraphic types and spatial distribution characteristics of all strontium-rich groundwater systems.

4. The method for rapid identification of strontium-rich strata and strontium-rich minerals in karst areas according to claim 1, characterized in that: In step 3, a typical stratigraphic section that can cover all strata of the strontium-rich groundwater system is selected, specifically: Obtain hydrogeological map data of the strontium-rich groundwater system, and based on the hydrogeological map data, delineate typical stratigraphic sections that can cover all strata within the strontium-rich groundwater system.

5. The method for rapid identification of strontium-rich strata and strontium-rich minerals in karst areas according to claim 4, characterized in that: There are one or more typical stratigraphic sections, and the typical stratigraphic sections are distributed along the road, and the rocks are well exposed.

6. The method for rapid identification of strontium-rich strata and strontium-rich minerals in karst areas according to claim 1, characterized in that: In step 4, based on the typical stratigraphic profile, strontium element scanning is performed to determine the strontium-rich layer and collect rock samples from the strontium-rich layer, specifically: Based on typical stratigraphic profiles, XRF heavy metal analyzers were used to carry out strontium element scanning in accordance with the principle of covering all strata at equal intervals. Tests were intensified at stratum boundaries and rock type mutations to determine strontium-rich strata and collect rock samples from strontium-rich strata, with an interval of 50-100m.

7. The method for rapid identification of strontium-rich strata and strontium-rich minerals in karst areas according to claim 6, characterized in that: The diameter of the rock sample is greater than or equal to 5 cm, the weight is greater than or equal to 1 kg, and the rock sample is a rock sample with a fresh rock surface.

8. The method for rapid identification of strontium-rich strata and strontium-rich minerals in karst areas according to claim 1, characterized in that: In step 5, the collected rock samples are tested for strontium-rich minerals and their content to determine the type of strontium-rich minerals, specifically: After the collected rock samples were initially tested based on thin section identification, they were further precisely tested using scanning electron microscopy and energy spectrum testing to test strontium-rich minerals and their content and determine the types of strontium-rich minerals.

Images