Methods, apparatus, media, and devices for quantitatively analyzing magma source rock properties of rocks

Abstract

This invention provides a method, apparatus, medium, and equipment for quantitatively analyzing the magmatic source rock properties of rocks. The method includes: obtaining the ε-coefficient of zircon grains in the rock through testing. Hf (t) and crystallization age t; ε of zircon grains in the rock Hf (t) is linearly fitted with the crystallization age t of zircon to obtain the first linear equation; the ε of zircon grains in the depleted mantle is then calculated based on the first linear equation. Hf(t) The intersection point of the second linear equation with its crystallization age t; based on the intersection point and the coefficients of the first linear equation, the initial formation time of the zircon grains is obtained. 176 Lu / 177 Hf ratio; the initial formation of zircon grains 176 Lu / 177 Hf ratio and preset different properties of magmatic source rocks 176 Lu / 177 The Hf ratio is matched to determine the magmatic source rock properties of a rock. This invention enables quantitative analysis of the magmatic source rock properties of rocks, elevating the analysis from qualitative constraints to quantitative analysis.

Description

Technical Field

[0001] This invention belongs to the field of geology, and in particular relates to a method, apparatus, medium and equipment for quantitatively analyzing the magmatic source rock properties of rocks. Background Technology

[0002] Zircon has a high Hf content (0.5%–2%) and a very low Lu / Hf ratio (usually less than 0.002). 176 Lu decay produces 176 Hf is extremely rare, so the zircon grains measured... 176 Hf / 177 The Hf ratio essentially represents the Hf isotopic composition of the system during zircon formation. (The last part, "zircon grains," appears to be an unrelated fragment and is omitted from the translation.) 176 Hf / 177 Hf ratio and zircon grains in chondrites 176 Hf / 177 One ten-thousandth of the difference in the Hf ratio is expressed as ε. Hf (t), ε Hf In (t), t represents the crystallization age of zircon.

[0003] Currently, the ε of zircon grains in commonly used rocks Hf(t) Qualitative analysis of the magmatic source rock properties of the rock. εz of zircon grains. Hf(t) A value greater than 0 indicates that the magmatic source rock of the rock may have originated from neogene, which could be depleted mantle, or molten material from young mantle-derived lower crust. The ε value of zircon grains... Hf(t) When the value is less than 0, it indicates that the magmatic source of the rock may have come from molten material from the ancient crust.

[0004] However, current research methods can only qualitatively analyze the magmatic source rock properties of rocks and cannot provide quantitative analytical indicators. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention provides a method, apparatus, storage medium and device.

[0006] In a first aspect, embodiments of the present invention provide a method for quantitatively analyzing the magmatic source rock properties of rocks, comprising:

[0007] The ε of zircon grains in the rock was obtained through testing. Hf (t) and crystallization age t, where ε Hf (t) represents zircon grains in the rock. 176 Hf / 177 Hf value and zircon grains in chondrites 176 Hf / 177 The difference in Hf values ​​is one ten-thousandth;

[0008] ε of zircon grains in rocks Hf The first linear equation is obtained by linearly fitting (t) with the crystallization age t of zircon;

[0009] Find the ε of the zircon grains in the first linear equation and the depleted mantle. Hf(t) The intersection point of its second linear equation with its crystallization age t;

[0010] Based on the intersection point and the coefficients of the first linear equation, the initial formation time of the zircon grains can be obtained. 176 Lu / 177 Hf ratio;

[0011] The initial formation of zircon particles 176 Lu / 177 Hf ratio and preset different properties of magmatic source rocks 176 Lu / 177 Hf ratios are matched to determine the magmatic source rock nature of the rock.

[0012] In some embodiments, in the method for quantitatively analyzing the magmatic source rock properties of rocks, the ε-coefficient of zircon grains in the rock is obtained by testing. Hf (t) and crystallization age t, including:

[0013] Zircon dating and Lu-Hf isotope analysis were performed on the rock to obtain the ε-values ​​of the zircon grains in the rock. Hf (t) and crystallization age t.

[0014] In some embodiments, in the method for quantitatively analyzing the magmatic source rock properties of rocks, the first linear equation is as follows:

[0015] ε Hf(t) =at+b,R 2

[0016] Among them, R 2 Represents the linear correlation coefficient;

[0017] a and b represent the coefficients of the first linear equation.

[0018] In some embodiments, in the method for quantitatively analyzing the magmatic source rock properties of rocks, the initial formation time of zircon grains is determined based on the intersection point and the coefficients of the first linear equation. 176 Lu / 177 Hf ratio, including:

[0019] ε Hf(t＝0) =b and the intersection point mentioned above, substitute into the zircon grains in the rock. 176 Lu / 177 Hf ratio, 176 Hf / 177The isochron equation satisfied by the Hf ratio and crystallization age t and ε Hf The formula for calculating (t) yields the initial formation of zircon grains. 176 Lu / 177 Hf ratio:

[0020]

[0021] in, Indicates the initial formation of zircon grains 176 Lu / 177 Hf ratio.

[0022] In some embodiments, in the method for quantitatively analyzing the magmatic source rock properties of the rock, the ε of the zircon grains in the depleted mantle... Hf(t) The second linear equation relating it to the crystallization age t is: ε Hf(t) = -0.003728t + 17.

[0023] In some embodiments, in the method for quantitatively analyzing the magmatic source rock properties of rocks, the expression for the intersection point is:

[0024]

[0025] In some embodiments, in the method for quantitatively analyzing the magmatic source rock properties of the rock, the zircon grains in the rock... 176 Lu / 177 Hf ratio, 176 Hf / 177 The isochron equation satisfied by the Hf ratio and the crystallization age t is:

[0026] ( 176 Hf / 177 Hf) t =( 176 Hf / 177 Hf) t＝0 +( 176 Lu / 177 Hf) t ×(exp(λt)-1)

[0027] Where λ is 176 The decay constant of Lu.

[0028] Secondly, embodiments of the present invention provide an apparatus for quantitatively analyzing the magmatic source rock properties of rocks, comprising:

[0029] The data testing module is used to obtain the ε of zircon grains in rocks through testing. Hf (t) and crystallization age t, where ε Hf (t) represents zircon grains in the rock.176 Hf / 177 Hf value and zircon grains in chondrites 176 Hf / 177 The difference in Hf values ​​is one ten-thousandth;

[0030] The data testing module is used to measure the ε of zircon grains in rocks. Hf The first linear equation is obtained by linearly fitting (t) with the crystallization age t of zircon;

[0031] The linear fitting module is used to obtain the ε of zircon grains in the first linear equation and the zircon grains in the depleted mantle. Hf(t) The intersection point of its second linear equation with its crystallization age t;

[0032] The ratio calculation module is used to determine the initial formation time of zircon grains based on the intersection point and the coefficients of the first linear equation. 176 Lu / 177 Hf ratio;

[0033] The ratio matching module is used to match the initial formation of zircon grains. 176 Lu / 177 Hf ratio and preset different properties of magmatic source rocks 176 Lu / 177 Hf ratios are matched to determine the magmatic source rock nature of the rock.

[0034] Thirdly, embodiments of the present invention provide a computer-readable storage medium storing a computer program, which, when executed by one or more processors, implements the method for quantitatively analyzing the magmatic source rock properties of rocks as described in the first aspect.

[0035] Fourthly, embodiments of the present invention provide an electronic device, including a memory and one or more processors, wherein the memory stores a computer program, and when the computer program is executed by the one or more processors, it implements the method for quantitatively analyzing the magmatic source rock properties of rocks as described in the first aspect.

[0036] Compared with the prior art, one or more embodiments of the present invention have at least the following beneficial effects:

[0037] This invention provides a method, apparatus, medium, and equipment for quantitatively analyzing the magmatic source rock properties of rocks, and obtains the ε-coefficient of zircon grains in rocks through testing. Hf The t-value and crystallization age t were obtained, and a linear fit was performed on the two. The linear equation was then compared with the ε-value of the depleted mantle zircon grains. Hf The intersection of the linear equation of (t) and its crystallization age t is used to obtain the ε at the initial formation of zircon in the rock. Hf (t) value, put εHf (t) value and ε Hf(0) Substitute the value into ε Hf Solving the equations for (t) and zircon isochrones, we can obtain the initial formation time of zircon grains. 176 Lu / 177 The Hf ratio is used to quantitatively analyze the magmatic source rocks of rocks. It represents the initial formation of zircon grains in the rock. 176 Lu / 177 A smaller Hf ratio indicates a more basic magmatic source rock, while a larger ratio indicates a more acidic source rock. This invention enables quantitative analysis of the magmatic source rock properties of rocks and has significant potential for widespread application. It breaks through previous research methods, elevating the understanding of magmatic source rock properties from qualitative constraints to quantitative analysis, which is of great importance. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope.

[0039] Figure 1 This is a flowchart of a method for quantitatively analyzing the magmatic source rock properties of rocks, provided by an embodiment of the present invention;

[0040] Figure 2 The ε-zircon grain test of granite rocks from the Huai'an area of ​​the Central Orogenic Belt in North China, provided in this embodiment of the invention, is... Hf(t) And the crystallization age of zircon;

[0041] Figure 3 This is a block diagram of an apparatus for quantitatively analyzing the magmatic source rock properties of rocks, provided in an embodiment of the present invention. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0043] Zircon has a high Hf content (0.5%–2%) and a very low Lu / Hf ratio (usually less than 0.002). 176 Lu decay produces176 Hf is extremely rare, so the zircon grains measured... 176 Hf / 177 The Hf ratio essentially represents the Hf isotopic composition of the system during zircon formation. (The last part, "zircon grains," appears to be an unrelated fragment and is omitted from the translation.) 176 Hf / 177 Hf ratio and zircon grains in chondrites 176 Hf / 177 One ten-thousandth of the difference in the Hf ratio is expressed as ε. Hf(t) , ε Hf(t) In this context, t represents the crystallization age of zircon.

[0044] Currently, the ε of zircon grains in commonly used rocks Hf(t) Qualitative analysis of the magmatic source rock properties of the rock. εz of zircon grains. Hf(t) A value greater than 0 indicates that the magmatic source rock of the rock may have originated from neogene, which could be depleted mantle, or molten material from young mantle-derived lower crust. The ε value of zircon grains... Hf(t) When the value is less than 0, it indicates that the magmatic source of the rock may have come from molten material from the ancient crust.

[0045] However, current research methods can only qualitatively analyze the magmatic source rock properties of rocks and cannot provide quantitative analytical indicators.

[0046] Therefore, embodiments of the present invention provide a method, apparatus, medium, and equipment for quantitatively analyzing the magmatic source rock properties of rocks, and obtain the ε-value of zircon grains in rocks through testing. Hf The t-value and crystallization age t were obtained, and a linear fit was performed on the two. The linear equation was then compared with the ε-value of the depleted mantle zircon grains. Hf The intersection of the linear equation of (t) and its crystallization age t is used to obtain the ε at the initial formation of zircon in the rock. Hf (t) value, put ε Hf (t) value and ε Hf(0) Substitute the value into ε Hf Solving the equations for (t) and zircon isochrones, we can obtain the initial formation time of zircon grains. 176 Lu / 177 The Hf ratio is used to quantitatively analyze the magmatic source rocks of rocks. It represents the initial formation of zircon grains in the rock. 176 Lu / 177 A smaller Hf ratio indicates a more basic magmatic source rock; conversely, a larger Hf ratio indicates a more acidic source rock. This invention can quantitatively analyze the magmatic source rock properties of rocks and has significant potential for widespread application.

[0047] Example 1

[0048] Figure 1This is a flowchart illustrating a method for quantitatively analyzing the magmatic source rock properties of rocks provided in this embodiment. Figure 1 As shown, the method for quantitatively analyzing the magmatic source rock properties of rocks in this embodiment includes steps S101 to S104:

[0049] Step S101: Obtain the ε of zircon grains in the rock through testing. Hf (t) and crystallization age t.

[0050] Where, ε Hf (t) represents zircon grains in the rock. 176 Hf / 177 Hf value and zircon grains in chondrites 176 Hf / 177 The difference in Hf values ​​is one ten-thousandth.

[0051] In some embodiments, step S101 involves obtaining the ε of zircon grains in the rock through testing. Hf (t) and crystallization age t, including:

[0052] Step S101a: Zircon dating and Lu-Hf isotope analysis are performed on the rock to obtain the ε-values ​​of the zircon grains in the rock. Hf (t) and crystallization age t.

[0053] In related technologies, ε Hf (t) represents zircon grains in the rock. 176 Hf / 177 Hf value and zircon grains in chondrites 176 Hf / 177 One ten-thousandth of the difference in Hf values ​​can be expressed by the following equation:

[0054] ε Hf (t)=(( 176 Hf / 177 Hf) t / ( 176 Hf / 177 Hf) chondrites -1)×10000 (1)

[0055] Step S102: ε-coating of zircon grains in the rock. Hf The first linear equation is obtained by linearly fitting (t) with the crystallization age t of zircon.

[0056] In some embodiments, the ε of zircon grains in the rock is... Hf The first linear equation obtained by linearly fitting (t) with the crystallization age y of zircon is as follows:

[0057] ε Hf(t) =at+b,R 2(2)

[0058] in,

[0059] a and b represent the coefficients of the first linear equation;

[0060] The unit of t is millions of years (Ma);

[0061] R 2 R represents the linear correlation coefficient, indicating the homogeneity of the source rocks of the magma. 2 A larger R value indicates stronger homogeneity of the magmatic source rock. 2 A smaller value indicates poor homogeneity of the magmatic source rock. 2 It takes values ​​from 0 to 1.

[0062] We can obtain the following from the first linear equation:

[0063] ε Hf(t＝0) =b (3)

[0064] Step S103: Obtain the first linear equation and the ε of zircon grains in the depleted mantle. Hf(t) The intersection point of the second linear equation with its crystallization age t.

[0065] ε of zircon grains in depleted mantle Hf(t) The second linear equation relating it to the crystallization age t is:

[0066] ε Hf(t) =-0.003728t+17 (4)

[0067] Find the intersection point of the first linear equation in equation (2) and the second linear equation in equation (4). The expression for the intersection point is as follows: Right now:

[0068]

[0069] Step S104: Based on the intersection point and the coefficients of the first linear equation, calculate the initial formation time of the zircon grains. 176 Lu / 177 Hf ratio; including:

[0070] ε Hf(t＝0) =b and the intersection point, substitute into the zircon grains in the rock 176 Lu / 177 Hf ratio, 176 Hf / 177 The isochron equation satisfied by the Hf ratio and crystallization age t and ε Hf The formula for calculating (t) yields the initial formation of zircon grains. 176 Lu / 177 Hf ratio:

[0071]

[0072] in, Indicates the initial formation of zircon grains 176 Lu / 177 Hf ratio.

[0073] In some embodiments, zircon grains in the rock 176 Lu / 177 Hf ratio, 176 Hf / 177 The isochron equation satisfied by the Hf ratio and the crystallization age t is:

[0074] ( 176 Hf / 177 Hf) t =( 176 Hf / 177 Hf) t＝0 +( 176 Lu / 177 Hf) t ×(exp(λt)-1) (6)

[0075] Where λ is 176 The decay constant of Lu.

[0076] In some cases, the value of λ is 1.865 × 10⁻⁶. -5 Millions of years -1 (Ma -1 ), ( 176 Hf / 177 Hf) chondrites =0.282772.

[0077] ε in equation (3) Hf(t＝0) Substituting the intersection of b and equation (5) into equations (6) and (1), we obtain:

[0078]

[0079] in, Indicates the initial formation of zircon grains 176 Lu / 177 Hf ratio.

[0080] Step S105: Initial formation of zircon grains 176 Lu / 177 Hf ratio and preset different properties of magmatic source rocks 176 Lu / 177 Hf ratios are matched to determine the magmatic source rock nature of the rock.

[0081] The initial formation of zircon grains in rocks176 Lu / 177 The smaller the Hf ratio, the more basic the magmatic source rock of the rock; conversely, the more acidic the magmatic source rock of the rock.

[0082] Chondrites today 176 Lu / 177 The Hf value is 0.0332, indicating a moderately depleted subcontinental lithospheric mantle (SCLM). 176 Lu / 177 The Hf ratio is 0.0315, indicating a basic lower crust. 176 Lu / 177 The Hf ratio is 0.0212, indicating an acidic upper crust. 176 Lu / 177 The Hf ratio is 0.0093, which is the average crustal... 76 Lu / 177 The Hf ratio is 0.0130.

[0083] In practical applications, based on existing magma source rocks of different properties... 176 Hf / 177 The Hf ratio can be used to identify the magmatic source rock nature of a rock.

[0084] The method for quantitatively analyzing the magmatic source rock properties of rocks provided in this invention obtains the ε-value of zircon grains in the rock through testing. Hf The t-value and crystallization age t were obtained, and a linear fit was performed on the two. The linear equation was then compared with the ε-value of the depleted mantle zircon grains. Hf The intersection of the linear equation of (t) and its crystallization age t is used to obtain the ε at the initial formation of zircon in the rock. Hf (t) value, put ε Hf (t) value and ε Hf(0) Substitute the value into ε Hf Solving the equations for (t) and zircon isochrones, we can obtain the initial formation time of zircon grains. 176 Lu / 177 The Hf ratio is used to quantitatively analyze the magmatic source rocks of rocks. It represents the initial formation of zircon grains in the rock. 176 Lu / 177 A smaller Hf ratio indicates a more basic magmatic source rock; conversely, a larger Hf ratio indicates a more acidic source rock. This invention can quantitatively analyze the magmatic source rock properties of rocks and has significant potential for widespread application.

[0085] Example 2

[0086] This embodiment provides an application example of the method of the present invention for quantitative analysis of the magmatic source rock properties, as detailed below:

[0087] Step 1: Zircon dating and Lu-Hf isotope analysis were performed on granite rocks from the Huai'an area of ​​the Central Orogenic Belt in North China. The ages of the zircon grains were found to be in the range of 2.6–2.3 Ga, with -0.07 ≤ ε. Hf(t) ≤7.32, ε Hf The average value of (t) is 2.79.

[0088] Based on the test results, the magma of the granite may have originated from molten material in the newly formed crust.

[0089] ε Hf (t) represents zircon grains in the rock. 176 Hf / 177 Hf value and zircon grains in chondrites 176 Hf / 177 One ten-thousandth of the difference in Hf values ​​can be expressed by the following equation:

[0090] ε Hf (t)=(( 176 Hf / 177 Hf) t / ( 176 Hf / 177 Hf) chondrites -1)×10000(1)

[0091] Step 2: Analyze the ε-coating of zircon grains in the granite rock. Hf(t) The value was linearly fitted with the crystallization age t of zircon, such as... Figure 2 As shown, the first linear equation is obtained:

[0092] ε Hf(t) =0.022t-49.623, R 2 =0.799 (2)

[0093] Where t is in units of millions of years (Ma);

[0094] R 2 This indicates that the source rocks of the magma are homogeneous.

[0095] From this linear equation, we can obtain:

[0096] ε Hf(t＝0) =-49.623 (3)

[0097] That is, the coefficients of the first linear equation are a = 0.022 and b = 49.632.

[0098] Step 3: Obtain the first linear equation and the ε of zircon grains in the depleted mantle. Hf(t) The intersection point of its second linear equation with its crystallization age t;

[0099] Zircon grains ε in depleted mantle Hf(t) The linear equation between the value and its crystallization age t is:

[0100] ε Hf(t) =-0.003728t+17 (4)

[0101] The unit of t is millions of years (Ma).

[0102] Find the intersection point of the first linear equation in equation (2) and the second linear equation in equation (4). The intersection point is (2589Ma, 7.346), which is...

[0103] ε Hf(2589Ma) =7.346 (5)

[0104] Step 4: Based on the intersection points and the coefficients of the first linear equation, determine the initial formation time of the zircon grains. 176 Hf / 177 Hf ratio;

[0105] ε Hf(t＝0) = -49.623 and the intersection point ε Hf(2589Ma) =7.346, substituted into the zircon grains in the rock 176 Lu / 177 Hf ratio, 176 Hf / 177 The isochron equation (6) satisfied by the Hf ratio and crystallization age t and ε Hf The calculation formula (1) for (t) yields the initial formation of zircon grains. 176 Lu / 177 Hf ratio.

[0106] Zircon grains in rocks 76 Lu / 177 Hf ratio, 176 Hf / 177 The Hf ratio and the crystallization age t satisfy the following isochron equation:

[0107] ( 176 Hf / 177 Hf) t =( 176 Hf / 177 Hf) t＝0 +( 176 Lu / 177 Hf) t ×(exp(λt)-1) (6)

[0108] Where t is in millions of years (Ma), and λ is... 176 The decay constant of Lu, λ, is 1.865 × 10⁻⁶. -5 Millions of years -1(Ma -1 ), ( 176 Hf / 177 Hf) chondrites =0.282772.

[0109] Find:

[0110] ( 176 Lu / 177 Hf) 2589Ma =0.033 (7)

[0111] in,( 176 Lu / 177 Hf) 2589Ma It is the initial formation of the obtained zircon grains 176 Lu / 177 Hf ratio

[0112] Relevant data shows that the initial formation of zircon grains in rocks 176 Lu / 177 The Hf ratio is 0.033, close to that of a moderately depleted subcontinental lithospheric mantle (SCLM). 176 Lu / 177 The Hf value is 0.0315. Therefore, it can be concluded that the magma source of this granite is molten material from the moderately depleted subcontinental lithospheric mantle (SCLM) of the Archean.

[0113] Example 3

[0114] Figure 3 A block diagram of an apparatus for quantitatively analyzing the magmatic source rock properties of rocks is shown, such as... Figure 3 As shown, this embodiment provides an apparatus for quantitatively analyzing the magmatic source rock properties of rocks, comprising:

[0115] Data testing module 301 is used to obtain the ε of zircon grains in rocks through testing. Hf (t) and crystallization age t, where ε Hf (t) represents zircon grains in the rock. 176 Hf / 177 Hf value and zircon grains in chondrites 176 Hf / 177 The difference in Hf values ​​is one ten-thousandth;

[0116] Data testing module 302 is used to measure the ε of zircon grains in rocks. Hf The first linear equation is obtained by linearly fitting (t) with the crystallization age t of zircon;

[0117] Linear fitting module 303 is used to obtain the ε of the first linear equation and zircon grains in the depleted mantle. Hf(t)The intersection point of its second linear equation with its crystallization age t;

[0118] The ratio calculation module 304 is used to calculate the initial formation value of zircon grains based on the intersection point and the coefficients of the first linear equation. 176 Hf / 177 Hf ratio;

[0119] The ratio matching module 305 is used to match the initial zircon grains during their initial formation. 176 Lu / 177 Hf ratio and preset different properties of magmatic source rocks 176 Lu / 177 Hf ratios are matched to determine the magmatic source rock nature of the rock.

[0120] In some implementations, the ε of zircon grains in the rock is obtained by testing. Hf (t) and crystallization age t, including: zircon dating and Lu-Hf isotope analysis of the rock to obtain the ε-coefficient of zircon grains in the rock. Hf (t) and crystallization age t.

[0121] In related technologies, ε Hf (t) represents zircon grains in the rock. 176 Hf / 177 Hf value and zircon grains in chondrites 176 Hf / 177 One ten-thousandth of the difference in Hf values ​​can be expressed by the following equation:

[0122] ε Hf (t)=(( 176 Hf / 177 Hf) t / ( 176 Hf / 177 Hf) chondrites -1)×10000 (1)

[0123] In some embodiments, the ε of zircon grains in the rock is... Hf The first linear equation obtained by linearly fitting (t) with the crystallization age t of zircon is as follows:

[0124] ε Hf(t) =at+b,R 2 (2)

[0125] in,

[0126] a and b represent the coefficients of the first linear equation;

[0127] The unit of t is millions of years (Ma);

[0128] R 2R represents the linear correlation coefficient, indicating the homogeneity of the source rocks of the magma. 2 A larger R value indicates stronger homogeneity of the magmatic source rock. 2 A smaller value indicates poor homogeneity of the magmatic source rock. 2 It takes values ​​from 0 to 1.

[0129] We can obtain the following from the first linear equation:

[0130] ε Hf(t＝0) =b (3)

[0131] ε of zircon grains in depleted mantle Hf(t) The second linear equation relating it to the crystallization age t is:

[0132] ε Hf(t) =-0.003728t+17 (4)

[0133] Find the intersection point of the first linear equation in equation (2) and the second linear equation in equation (4). The expression for the intersection point is as follows: Right now:

[0134]

[0135] In some implementations, the initial formation time of the zircon grains is determined based on the intersection point and the coefficients of the first linear equation. 176 Lu / 177 Hf ratio, including:

[0136] In some embodiments, zircon grains in the rock 176 Lu / 177 Hf ratio, 176 Hf / 177 The isochron equation satisfied by the Hf ratio and the crystallization age t is:

[0137] ( 176 Hf / 177 Hf) t =( 176 Hf / 177 Hf) t＝0 +( 176 Lu / 177 Hf) t ×(exp(λt)-1) (6)

[0138] Where λ is 176 The decay constant of Lu.

[0139] In some cases, the value of λ is 1.865 × 10⁻⁶. -5 Millions of years -1 (Ma -1 ), (176 Hf / 177 Hf) chondrites =0.282772.

[0140] ε in equation (3) Hf(t＝0) Substituting the intersection of b and equation (5) into equations (6) and (1), we obtain:

[0141]

[0142] in, Indicates the initial formation of zircon grains 176 Lu / 177 Hf ratio.

[0143] The initial formation of zircon grains in rocks 176 Lu / 177 The smaller the Hf ratio, the more basic the magmatic source rock of the rock; conversely, the more acidic the magmatic source rock of the rock.

[0144] Chondrites today 176 Lu / 177 The Hf value is 0.0332, indicating a moderately depleted subcontinental lithospheric mantle (SCLM). 176 Lu / 177 The Hr ratio is 0.0315, indicating a basic lower crust. 176 Lu / 177 The Hf ratio is 0.0212, indicating an acidic upper crust. 176 Lu / 177 The Hf ratio is 0.0093, which is the average crustal... 76 Lu / 177 The Hf ratio is 0.0130.

[0145] In practical applications, based on existing magma source rocks of different properties... 176 Lu / 177 The Hf ratio can be used to identify the magmatic source rock nature of a rock.

[0146] The apparatus for quantitatively analyzing the magmatic source rock properties of rocks provided in this invention obtains the ε-value of zircon grains in rocks through testing. Hf The t-value and crystallization age t were obtained, and a linear fit was performed on the two. The linear equation was then compared with the ε-value of the depleted mantle zircon grains. Hf The intersection of the linear equation of (t) and its crystallization age t is used to obtain the ε at the initial formation of zircon in the rock. Hf (t) value, put ε Hf (t) value and ε Hf(0) Substitute the value into ε Hf Solving the equations for (t) and zircon isochrones, we can obtain the initial formation time of zircon grains. 176Lu / 177 The Hf ratio is used to quantitatively analyze the magmatic source rocks of rocks. It represents the initial formation of zircon grains in the rock. 176 Lu / 177 A smaller Hf ratio indicates a more basic magmatic source rock; conversely, a larger Hf ratio indicates a more acidic source rock. This invention can quantitatively analyze the magmatic source rock properties of rocks and has significant potential for widespread application.

[0147] It should be understood that the apparatus of this embodiment has all the beneficial effects of the method embodiment.

[0148] Those skilled in the art will understand that the above-described modules or steps can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. Optionally, they can be implemented using computer-executable program code, thereby storing them in a storage device for execution by the computing device, or fabricating them separately as individual integrated circuit modules, or fabricating multiple modules or steps into a single integrated circuit module. This invention is not limited to any specific hardware and software combination.

[0149] Example 4

[0150] This invention provides a computer-readable storage medium storing a computer program, which, when executed by one or more processors, implements the method of Embodiment 1.

[0151] In this embodiment, the storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0152] The method for quantitatively analyzing the magmatic source rock properties of rocks implemented in this embodiment includes steps S101 to S104:

[0153] Step S101: Obtain the ε of zircon grains in the rock through testing. Hf (t) and crystallization age t.

[0154] Where, ε Hf (t) represents zircon grains in the rock. 176 Hf / 177 Hf value and zircon grains in chondrites 176 Hf / 177 The difference in Hf values ​​is one ten-thousandth.

[0155] In some embodiments, step S101 involves obtaining the ε of zircon grains in the rock through testing. Hf (t) and crystallization age t, including:

[0156] Step S101a: Zircon dating and Lu-Hf isotope analysis are performed on the rock to obtain the ε-values ​​of the zircon grains in the rock. Hf (t) and crystallization age t.

[0157] In related technologies, ε Hf (t) represents zircon grains in the rock. 176 Hf / 177 Hf value and zircon grains in chondrites 176 Hf / 177 One ten-thousandth of the difference in Hf values ​​can be expressed by the following equation:

[0158] ε Hf (t)(( 176 Hf / 177 Hf) t / ( 176 Hf / 177 Hf) chondrites -1)×10000 (1)

[0159] Step S102: ε-coating of zircon grains in the rock. Hf The first linear equation is obtained by linearly fitting (t) with the crystallization age t of zircon.

[0160] In some embodiments, the ε of zircon grains in the rock is... Hf The first linear equation obtained by linearly fitting (t) with the crystallization age t of zircon is as follows:

[0161] ε Hf(t) =at+b,R 2 (2)

[0162] in,

[0163] a and b represent the coefficients of the first linear equation;

[0164] The unit of t is millions of years (Ma);

[0165] R 2 R represents the linear correlation coefficient, indicating the homogeneity of the source rocks of the magma. 2 A larger R value indicates stronger homogeneity of the magmatic source rock. 2 A smaller value indicates poor homogeneity of the magmatic source rock. 2 It takes values ​​from 0 to 1.

[0166] We can obtain the following from the first linear equation:

[0167] ε Hf(t＝0) =b (3)

[0168] Step S103: Obtain the first linear equation and the ε of zircon grains in the depleted mantle. Hf(t) The intersection point of the second linear equation with its crystallization age t.

[0169] ε of zircon grains in depleted mantle Hf(t) The second linear equation relating it to the crystallization age t is:

[0170] ε Hf(t) =-0.003728t+17 (4)

[0171] Find the intersection point of the first linear equation in equation (2) and the second linear equation in equation (4). The expression for the intersection point is as follows: Right now:

[0172]

[0173] Step S104: Based on the intersection point and the coefficients of the first linear equation, calculate the initial formation time of the zircon grains. 176 Lu / 177 Hf ratio; including:

[0174] ε Hf(t＝0) =b and the intersection point, substitute into the zircon grains in the rock 176 Lu / 177 Hf ratio, 176 Hf / 177 The isochron equation satisfied by the Hf ratio and crystallization age t and ε Hf The formula for calculating (t) yields the initial formation of zircon grains. 176 Lu / 177 Hf ratio:

[0175]

[0176] in, Indicates the initial formation of zircon grains 176 Lu / 177 Hf ratio.

[0177] In some embodiments, zircon grains in the rock 176 Lu / 177 Hf ratio, 176 Hf / 177 The isochron equation satisfied by the Hf ratio and the crystallization age t is:

[0178] ( 176 Hf / 177 Hf) t =( 176 Hf / 177 Hf) t＝0 +( 176 Lu / 177 Hf) t ×(exp(λt)-1) (6)

[0179] Where λ is 176 The decay constant of Lu.

[0180] In some cases, the value of λ is 1.865 × 10⁻⁶. -5 Millions of years -1 (Ma -1 ), ( 176 Hf / 177 Hf) chondrites =0.282772.

[0181] ε in equation (3) Hf(t＝0) Substituting the intersection of b and equation (5) into equations (6) and (1), we obtain:

[0182]

[0183] in, Indicates the initial formation of zircon grains 176 Lu / 177 Hf ratio.

[0184] Step S105: Initial formation of zircon grains 176 Lu / 177 Hf ratio and preset different properties of magmatic source rocks 176 Lu / 177 Hf ratios are matched to determine the magmatic source rock nature of the rock.

[0185] The initial formation of zircon grains in rocks 176 Lu / 177 The smaller the Hf ratio, the more basic the magmatic source rock of the rock; conversely, the more acidic the magmatic source rock of the rock.

[0186] Chondrites today176 Lu / 177 The Hf value is 0.0332, indicating a moderately depleted subcontinental lithospheric mantle (SCLM). 176 Lu / 177 The Hf ratio is 0.0315, indicating a basic lower crust. 176 Lu / 177 The Hf ratio is 0.0212, indicating an acidic upper crust. 176 Lu / 177 The Hf ratio is 0.0093, which is the average crustal... 76 Lu / 177 The Hf ratio is 0.0130.

[0187] In practical applications, based on existing magma source rocks of different properties... 176 Lu / 177 The Hf ratio can be used to identify the magmatic source rock nature of a rock.

[0188] The method for quantitatively analyzing the magmatic source rock properties of rocks provided in this invention obtains the ε-value of zircon grains in the rock through testing. Hf The t-value and crystallization age t were obtained, and a linear fit was performed on the two. The linear equation was then compared with the ε-value of the depleted mantle zircon grains. Hf The intersection of the linear equation of (t) and its crystallization age t is used to obtain the ε at the initial formation of zircon in the rock. Hf (t) value, put ε Hf (t) value and ε Hf(0) Substitute the value into ε Hf Solving the equations for (t) and zircon isochrones, we can obtain the initial formation time of zircon grains. 176 Lu / 177 The Hf ratio is used to quantitatively analyze the magmatic source rocks of rocks. It represents the initial formation of zircon grains in the rock. 176 Lu / 177 A smaller Hf ratio indicates a more basic magmatic source rock; conversely, a larger Hf ratio indicates a more acidic source rock. This invention can quantitatively analyze the magmatic source rock properties of rocks and has significant potential for widespread application.

[0189] Example 5

[0190] This embodiment provides an electronic device, including a memory and one or more processors. The memory stores a computer program, which, when executed by one or more processors, implements the method of Embodiment 1.

[0191] In practical applications, electronic devices can be terminal devices such as mobile phones and tablets. In this embodiment, the processor can be implemented as an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a controller, a microcontroller, a microprocessor, or other electronic components, and is used to execute the methods in the above embodiments. The methods implemented when the computer program running on the processor is executed can be referred to the specific embodiments of the methods provided in the foregoing embodiments of the present invention, and will not be repeated here.

[0192] The method for quantitatively analyzing the magmatic source rock properties of rocks implemented in this embodiment includes steps S101 to S104:

[0193] Step S101: Obtain the ε of zircon grains in the rock through testing. Hf (t) and crystallization age t.

[0194] Where, ε Hf (t) represents zircon grains in the rock. 176 Hf / 177 Hf value and zircon grains in chondrites 176 Hf / 177 The difference in Hf values ​​is one ten-thousandth.

[0195] In some embodiments, step S101 involves obtaining the ε of zircon grains in the rock through testing. Hf (t) and crystallization age t, including:

[0196] Step S101a: Zircon dating and Lu-Hf isotope analysis are performed on the rock to obtain the ε-values ​​of the zircon grains in the rock. Hf (t) and crystallization age t.

[0197] In related technologies, ε Hf (t) represents zircon grains in the rock. 176 Hf / 177 Hf value and zircon grains in chondrites 176 Hf / 177 One ten-thousandth of the difference in Hf values ​​can be expressed by the following equation:

[0198] ε Hf(t)=(( 176 Hf / 177 Hf) t / ( 176 Hf / 177 Hf) chondrites -1)×10000 (1)

[0199] Step S102: ε-coating of zircon grains in the rock. Hf The first linear equation is obtained by linearly fitting (t) with the crystallization age t of zircon.

[0200] In some embodiments, the ε of zircon grains in the rock is... Hf The first linear equation obtained by linearly fitting (t) with the crystallization age t of zircon is as follows:

[0201] ε Hf(t) =at+b,R 2 (2)

[0202] in,

[0203] a and b represent the coefficients of the first linear equation;

[0204] The unit of t is millions of years (Ma);

[0205] R 2 R represents the linear correlation coefficient, indicating the homogeneity of the source rocks of the magma. 2 A larger R value indicates stronger homogeneity of the magmatic source rock. 2 A smaller value indicates poor homogeneity of the magmatic source rock. 2 It takes values ​​from 0 to 1.

[0206] We can obtain the following from the first linear equation:

[0207] ε Hf(t＝0) =b (3)

[0208] Step S103: Obtain the first linear equation and the ε of zircon grains in the depleted mantle. Hf(t) The intersection point of the second linear equation with its crystallization age t.

[0209] ε of zircon grains in depleted mantle Hf(t) The second linear equation relating it to the crystallization age t is:

[0210] ε Hf(t) =-0.003728t+17 (4)

[0211] Find the intersection point of the first linear equation in equation (2) and the second linear equation in equation (4). The expression for the intersection point is as follows: Right now:

[0212]

[0213] Step S104: Based on the intersection point and the coefficients of the first linear equation, calculate the initial formation time of the zircon grains. 176 Lu / 177 Hf ratio; including:

[0214] ε Hf(t＝0) =b and the intersection point, substitute into the zircon grains in the rock 176 Lu / 177 Hf ratio, 176 Hf / 177 The isochron equation satisfied by the Hf ratio and crystallization age t and ε Hf The formula for calculating (t) yields the initial formation of zircon grains. 176 Lu / 177 Hf ratio:

[0215]

[0216] in, Indicates the initial formation of zircon grains 176 Lu / 177 Hf ratio.

[0217] In some embodiments, zircon grains in the rock 176 Lu / 177 Hf ratio, 176 Hf / 177 The isochron equation satisfied by the Hf ratio and the crystallization age t is:

[0218] ( 176 Hf / 177 Hf) t =( 176 Hf / 177 Hf) t＝0 +( 176 Lu / 177 Hf) t ×(exp(λt)-1) (6)

[0219] Where λ is 176 The decay constant of Lu.

[0220] In some cases, the value of λ is 1.865 × 10⁻⁶. -5 Millions of years -1 (Ma -1 ), ( 176 Hf / 177 Hf) chondrites =0.282772.

[0221] ε in equation (3)Hf(t＝0) Substituting the intersection of b and equation (5) into equations (6) and (1), we obtain:

[0222]

[0223] in, Indicates the initial formation of zircon grains 176 Lu / 177 Hf ratio.

[0224] Step S105: Initial formation of zircon grains 176 Lu / 177 Hf ratio and preset different properties of magmatic source rocks 176 Lu / 177 Hf ratios are matched to determine the magmatic source rock nature of the rock.

[0225] The initial formation of zircon grains in rocks 176 Lu / 177 The smaller the Hf ratio, the more basic the magmatic source rock of the rock; conversely, the more acidic the magmatic source rock of the rock.

[0226] Chondrites today 176 Lu / 177 The Hf value is 0.0332, indicating a moderately depleted subcontinental lithospheric mantle (SCLM). 176 Lu / 177 The Hf ratio is 0.0315, indicating a basic lower crust. 176 Lu / 177 The Hf ratio is 0.0212, indicating an acidic upper crust. 176 Lu / 177 The Hf ratio is 0.0093, which is the average crustal... 76 Lu / 177 The Hf ratio is 0.0130.

[0227] In practical applications, based on existing magma source rocks of different properties... 176 Lu / 177 The Hf ratio can be used to identify the magmatic source rock nature of a rock.

[0228] The method for quantitatively analyzing the magmatic source rock properties of rocks provided in this invention obtains the ε-value of zircon grains in the rock through testing. Hf The t-value and crystallization age t were obtained, and a linear fit was performed on the two. The linear equation was then compared with the ε-value of the depleted mantle zircon grains. Hf The intersection of the linear equation of (t) and its crystallization age t is used to obtain the ε at the initial formation of zircon in the rock. Hf (t) value, put ε Hf (t) value and ε Hf (0) Substitute the value into ε Hf Solving the equations for (t) and zircon isochrones, we can obtain the initial formation time of zircon grains. 176 Lu / 177 The Hf ratio is used to quantitatively analyze the magmatic source rocks of rocks. It represents the initial formation of zircon grains in the rock. 176 Lu / 177 A smaller Hf ratio indicates a more basic magmatic source rock; conversely, a larger Hf ratio indicates a more acidic source rock. This invention can quantitatively analyze the magmatic source rock properties of rocks and has significant potential for widespread application.

[0229] In the several embodiments provided in this invention, it should be understood that the disclosed systems and methods can also be implemented in other ways. The system and method embodiments described above are merely illustrative.

[0230] It should be noted that, in this document, the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0231] While the embodiments disclosed in this invention are as described above, the content is merely for the purpose of facilitating understanding of the invention and is not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and variations in form and detail of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection for this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A method of quantitatively analyzing the magma source rock properties of a rock, characterized by, include: By zircon dating and Lu Hf isotope testing of the rock to obtain a and crystallization age t ; wherein, represents a 176 Hf / 177 Hf value of the zircon grains in the rock and a 176 Hf / 177 Hf value of the zircon grains in the chondrite; and wherein the difference between the two values is in the order of 10-6. zircon grains in rocks With respect to the crystallization age of the zircon t A linear fit is performed to obtain the first linear equation, which is as follows: in, a and b represent the coefficients of the first linear equation; R 2 R is the linear correlation coefficient, indicating the homogeneity of the source rocks of the magma. 2 The higher the value, the stronger the homogeneity of the magmatic source rock. 2 The smaller the value, the worse the homogeneity of the magmatic source rock. 2 Value 0 1; ε is found by the first linear equation Hf(t＝0) = b; Find the first linear equation and the depleted mantle zircon grains Its crystallization age t The intersection point of the second linear equation, the intersection point being ; Will The intersection point, substituted with the zircon grains in the rock 176 Lu / 177 Hf ratio, 176 Hf / 177 Hf ratio and crystallization age t The isochron equations satisfied and The calculation formula yields the initial formation of zircon grains. 176 Hf / 177 Hf ratio: in, Indicates the initial formation of zircon grains 176 Lu / 177 Hf ratio; The ratio of Hf to Lu of the zircon grains is matched to pre-determined ratios of different types of magma source rocks to determine the nature of the magma source rock of the rock. 176 Lu / 177 Hf ratio, to pre-determined ratios of different types of magma source rocks to determine the nature of the magma source rock of the rock. 176 Lu / 177 Hf ratio, to pre-determined ratios of different types of magma source rocks to determine the nature of the magma source rock of the rock.

2. The method for quantitatively analyzing the magmatic source rock properties of rocks according to claim 1, characterized in that, Zircon grains in the depleted mantle Its crystallization age t The second linear equation is: .

3. The method for quantitatively analyzing the magmatic source rock properties of rocks according to claim 1, characterized in that, Zircon grains in the rock 176 Lu / 177 Hf ratio, 176 Hf / 177 Hf ratio and crystallization age t The equations satisfied by the isochrones are: in, yes 176 The decay constant of Lu.

4. An apparatus for quantitatively analyzing the magmatic source rock properties of rocks, characterized in that, include: The data testing module is used to perform zircon dating and Lu dating on rocks. Hf isotope analysis was used to obtain zircon grains in the rock. and crystallization age t ,in, Representing zircon grains in rocks 176 Hf / 177 Hf value and zircon grains in chondrites 176 Hf / 177 One ten-thousandth of the difference in Hf values; and used to separate zircon grains in rocks. Crystallization age of zircon t A linear fit is performed to obtain the first linear equation, which is as follows: ,in, represents the linear correlation coefficient; a and b represent the coefficients of the first linear equation; The linear fitting module is used to obtain the first linear equation and the depleted mantle zircon grains. Its crystallization age t The intersection of the second linear equation ; The ratio calculation module will The intersection point, substituted with the zircon grains in the rock 176 Lu / 177 Hf ratio, 176 Hf / 177 Hf ratio and crystallization age t The isochron equations satisfied and The calculation formula yields the initial formation of zircon grains. 176 Lu / 177 Hf ratio: in, Indicates the initial formation of zircon grains 176 Lu / 177 Hf ratio; The ratio matching module matches the calculated ratio of Lu / Hf of the zircon grain at the initial formation of the zircon grain with preset ratios of different properties of the magma source rock to determine the magma source property of the rock. 176 Lu / 177 Hf ratio of the zircon grain at the initial formation of the zircon grain with preset ratios of different properties of the magma source rock to determine the magma source property of the rock. 176 Lu / 177 Hf ratio of the zircon grain at the initial formation of the zircon grain with preset ratios of different properties of the magma source rock to determine the magma source property of the rock.

5. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by one or more processors, implements a method for quantitatively analyzing the magmatic source rock properties of rocks as described in any one of claims 1 to 3.

6. An electronic device, characterized in that, The system includes a memory and one or more processors, wherein the memory stores a computer program that, when executed by the one or more processors, implements a method for quantitatively analyzing the magmatic source rock properties of rocks as described in any one of claims 1 to 3.

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