Geochemical exploration methods for hydrothermal concealed uranium deposits

Abstract

The embodiments of the present application relate to the field of exploration using nuclear radiation, and in particular to a geochemical exploration method for hydrothermal concealed uranium deposits. The geochemical exploration method for hydrothermal concealed uranium deposits provided by the present application reduces the influence of the uranium content in the soil near the surface by measuring the active uranium content, total uranium content, and cation exchange capacity of soil samples in the area to be explored, and highlights the active uranium content from deep; determines the active uranium anomaly zone based on the deep active uranium equivalent, and analyzes the topography, structure, and concentration characteristics of the active uranium anomaly zone, excludes abnormal information that is not related to deep uranium mineralization, and improves the accuracy of judging favorable mineralization areas.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of exploration using nuclear radiation, and in particular to a geochemical exploration method for hydrothermal concealed uranium deposits. Background Art

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] Outcrop is the part of strata and rock bodies exposed on the surface, and concealed ore bodies refer to ore bodies that have no outcrops on the surface. At present, in the field of uranium exploration, shallow hydrothermal uranium deposits explored by radioactive measurement methods have been discovered, and the focus of hydrothermal uranium exploration has shifted to deep exploration. Concealed ore bodies do not appear on the surface, and their exploration is more difficult. Therefore, an exploration method is needed to determine the areas where concealed uranium deposits may exist. Summary of the invention

[0004] A brief overview of the present application is provided below in order to provide a basic understanding of certain aspects of the present application. It should be understood that this overview is not an exhaustive overview of the present application. It is not intended to identify the key or important parts of the present application, nor is it intended to limit the scope of the present application. Its purpose is merely to present certain concepts in a simplified form as a prelude to a more detailed description discussed later.

[0005] The embodiment of the present application provides a geochemical exploration method for hydrothermal concealed uranium deposits, which includes the following steps: S10: obtaining a soil sample from an area to be explored, and preparing a plurality of first soil samples and a second soil sample according to a first particle size and a second particle size; S20: determining the active uranium content of the first soil sample; S30: determining the total uranium content and the cation exchange capacity of the second soil sample; S40: determining the deep active uranium equivalent according to the active uranium content determined in step S20 and the total uranium content and the cation exchange capacity determined in step S30; S50: determining the active uranium anomaly zone according to the deep active uranium equivalent determined in step S40; S60: determining the topography and structure of the area to be explored and determining the concentration characteristics of the active uranium anomaly zone determined in step S50; S70: determining the favorable mineralization area according to the topography, structure and concentration characteristics determined in step S60.

[0006] The geochemical exploration method for hydrothermal concealed uranium deposits provided in the embodiments of the present application reduces the influence of the uranium content in the soil near the surface and highlights the active uranium content from deep inside by measuring the active uranium content, total uranium content and cation exchange capacity of soil samples in the area to be explored; and determines the active uranium anomaly zone based on the deep active uranium equivalent, and analyzes the topography, structure and concentration characteristics of the anomaly zone to exclude anomaly information irrelevant to deep uranium mineralization, thereby improving the accuracy of judging favorable mineralization areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to further illustrate the above and other advantages and features of the present application, the specific embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. The accompanying drawings together with the following detailed description are included in this specification and form a part of this specification. Elements with the same function and structure are represented by the same reference numerals. It should be understood that these drawings only describe typical examples of the present application and should not be regarded as limiting the scope of the present application.

[0008] Figure 1 It is a schematic flow chart of the geochemical exploration method for hydrothermal concealed uranium deposits provided in the embodiments of the present application. DETAILED DESCRIPTION

[0009] Exemplary embodiments of the present application will be described below in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual implementation are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the process of developing any such actual implementation in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and these constraints may vary from implementation to implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is only a routine task for those skilled in the art who benefit from the content of this application.

[0010] It is also necessary to explain here that, in order to avoid obscuring the present application due to unnecessary details, only the device structure and / or processing steps closely related to the scheme according to the present application are shown in the accompanying drawings, while other details that are not very relevant to the present application are omitted.

[0011] The disclosure below provides a plurality of different embodiments or examples to implement the present application. In order to simplify the disclosure of the present application, the parts and methods of specific examples are described below. Of course, they are merely examples, and the purpose is not intended to limit the present application. In the description of the embodiments of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically limited.

[0012] Generally speaking, the active uranium elements produced by deep uranium ore bodies can migrate to the near surface under the action of various geological forces, and unload and enrich when encountering surface geochemical barriers. The uranium content in this active form is low, and the abnormal information formed on the surface is relatively weak, but it represents direct information of deep mineralization.

[0013] The inventors of the present application discovered that by reducing the active uranium content produced by near-surface soil weathering and the impact of horizontal migration of active uranium elements caused by terrain factors, and highlighting the active uranium content from deep within, it is possible to identify abnormal information related to deep uranium mineralization from numerous active uranium anomalies, thereby guiding the prediction and evaluation of concealed uranium mines.

[0014] The embodiment of the present application provides a geochemical exploration method for hydrothermal concealed uranium deposits. Figure 1 A flow chart of a method for geochemical exploration of hydrothermal concealed uranium deposits provided by an embodiment of the present application is shown, which comprises the following steps: S10: obtaining a soil sample from an area to be explored, and preparing a plurality of first soil samples and a second soil sample according to a first particle size and a second particle size; S20: determining the active uranium content of the first soil sample; S30: determining the total uranium content and the cation exchange capacity of the second soil sample; S40: determining the deep active uranium equivalent according to the active uranium content determined in step S20 and the total uranium content and the cation exchange capacity determined in step S30; S50: determining the active uranium anomaly zone according to the deep active uranium equivalent determined in step S40; S60: determining the topography and structure of the area to be explored, and determining the concentration characteristics of the active uranium anomaly zone determined in step S50; S70: determining a favorable mineralization area according to the topography, structure and concentration characteristics determined in step S60.

[0015] The geochemical exploration method for hydrothermal concealed uranium deposits provided in the present application reduces the influence of the uranium content in the soil near the surface and highlights the active uranium content from deep inside by measuring the active uranium content, total uranium content and cation exchange capacity of soil samples in the area to be explored; determines the active uranium anomaly zone based on the deep active uranium equivalent, and analyzes the topography, structure and concentration characteristics of the active uranium anomaly zone, excludes abnormal information unrelated to deep uranium mineralization, and improves the accuracy of judging favorable mineralization areas.

[0016] In some embodiments, in step S40, the deep active uranium equivalent, the active uranium content determined in step S20, the total uranium content determined in step S30, and the cation exchange capacity meet the following expression: , where U c represents the deep active uranium equivalent, U a represents the active uranium content determined by the S20 step, U bIt represents the product of the total uranium content determined in step S30 and the cation exchange capacity determined in step S30.

[0017] In some embodiments, in step S10, a predetermined number of sampling points are selected in the area to be investigated for soil sampling, a sample of a predetermined weight (for example, not less than 500 g) is collected at each sampling point, the soil sample is dried, and soil samples of different particle sizes are screened and intercepted (for example, the first soil sample has a particle size of -200 mesh, and the second soil sample has a particle size of -40 mesh).

[0018] In some embodiments, in step S20, the uranium content of the first soil sample with smaller particle size is measured, and the active uranium content of the soil is obtained by calculation, which is recorded as U a .

[0019] In some embodiments, in step S30, the uranium content of the second soil sample with larger particle size is determined, and the total uranium content of the soil is obtained by calculation; and the cation exchange capacity of the second soil sample with larger particle size is determined.

[0020] The use of selective extraction to analyze the content of uranium in active form in the soil can realize the exploration and prediction of hidden uranium mines. However, since the selective extraction of soil is the content of uranium in active form, the active uranium in the soil not only comes from deep inside, but also from the release of elements from weathering of near-surface rocks and soils and the horizontal migration of active uranium elements caused by terrain.

[0021] In some embodiments, in step S10, a clay-rich sample is collected at a transition point between the weathered rock debris layer and the clay layer.

[0022] In some embodiments, collecting weathered rock debris layers and clay samples in the transitional area above them can keep the samples away from the surface, greatly reducing the content of active uranium that migrates horizontally, and reducing the factors affecting the horizontal migration of active uranium. In addition, there is also the influencing factor of weathering of rock soil near the surface, and the content of active uranium produced by soil weathering is mainly related to the total uranium content of the soil and the degree of weathering of the soil. The higher the total uranium content in the soil and the higher the degree of soil weathering, the higher the content of active uranium released by its weathering. Cation exchange capacity can be used as an indicator to measure the degree of soil weathering.

[0023] The active uranium content in the soil is not only significantly positively correlated with the total uranium content in the soil, but also has a significant positive correlation with the cation exchange capacity. Therefore, the product of the total uranium content in the soil and the cation exchange capacity is taken as the active uranium equivalent produced by soil weathering, recorded as U b .

[0024] According to the active uranium content of the soil a and active uranium equivalent U produced by soil weatheringb Able to determine the deep active uranium equivalent U c , the three meet This can not only reduce the influencing factors of the horizontal migration of active uranium, but also take into account the factors of weathering of near-surface rock soil, reduce the impact of active uranium content produced by near-surface soil weathering, and highlight the active uranium content from deep.

[0025] In some embodiments, step S50 also includes the following steps: S51: determining the average value and mean square error of the deep active uranium equivalent; S52: according to a predetermined range determined by the average value and mean square error of the deep active uranium equivalent, eliminating the data within the predetermined range, and iterating multiple times in a predetermined manner to determine the final average value; S53: determining the active uranium anomaly zone based on the final average value.

[0026] In some embodiments, in step S52, the predetermined method is to calculate the remaining data in the same manner as the previous calculation based on the previous calculation.

[0027] In some embodiments, in step S52, the predetermined range is: >X 1 +2S 1 and <X 1 -2S 1 , where X 1 represents the average value of deep active uranium equivalent determined in step S51, S 1 Represents the mean square error of the deep activity equivalent determined in step S51.

[0028] In some embodiments, in steps S51 and S52, all soil samples U in the sampling area are calculated. c The average value of X 1 and mean square error S 1 , will be greater than X 1 +2S 1 and less than X 1 -2S 1 The data is removed; the average value of the remaining data is recalculated X 2 and mean square error S 2 , will be greater than X 2 +2S 2 and less than X 2 -2S 2 The data is removed; then the average value of the remaining data is calculated X 3 and mean square error S 3 , will be greater than X 3 +2S 3 and less than X 3 -2S 3 The data is removed and the above calculation method is repeated.

[0029] In some embodiments, in step S52, when there is no data that reaches the predetermined range, the average value of all remaining data outside the predetermined range is the final average value, and the active uranium anomaly region meets the following conditions: U c >X n +2S n , where U c is the deep active uranium equivalent, X n is the final average value, S n is the mean square error of all remaining data outside the predetermined range.

[0030] In step S52, when there is no U within the predetermined range c Value data can be removed, with all remaining U c The average value of the data X n is the final average value, S n For all remaining U outside the predetermined range c The mean square error of the data, X n +2S n is the abnormal lower limit, which indicates the lower limit of the abnormal active uranium content area. The soil sample U in the sampling area is determined according to the abnormal lower limit. c Value greater than X n +2S n The area composed of all sampling points that meet the conditions is the active uranium anomaly area.

[0031] In some embodiments, in step S70, if the active uranium anomaly zone is located in a low-lying area or a valley, the active uranium anomaly zone is a non-favorable area for mineralization.

[0032] In some embodiments, when obtaining soil samples in step S10, the altitude data of the sampling point is recorded, and the terrain of the active uranium anomaly zone delineated in step S50 is analyzed based on the altitude data. If the active uranium anomaly zone is located in a low-lying area or a valley, then the abnormal active uranium content in this area is determined to be formed by horizontal migration and aggregation of uranium elements caused by terrain factors, which is unrelated to deep uranium mineralization and is not caused by concealed uranium mines. The active uranium anomaly zone at this location is eliminated.

[0033] In some embodiments, in step S70, if the active uranium anomaly zone extends along the direction of the fault structure and its morphological trend is consistent with the fault structure, then the active uranium anomaly zone is a non-favorable area for mineralization.

[0034] In some embodiments, in step S60, structural information of the area to be investigated is obtained, such as the distribution morphology, trend and range. When the active uranium anomaly area delineated in step S70 is cut by a fault structure, the relationship between the distribution morphology, trend and range of the active uranium anomaly area and the fault structure is analyzed. Under the action of tectonic movement, rocks are deformed, broken and displaced, making the originally closed rock system open, which is conducive to the movement and diffusion of active uranium. In addition, tectonic movement may also change the porosity and permeability of rocks, further promoting the migration and enrichment of uranium elements, that is, the fault structure can provide an ideal channel for the migration of active uranium. Therefore, if the delineated active uranium anomaly area is distributed along the direction of the fault structure, and the morphological trend is consistent with the fault structure, then it is considered that the active uranium anomaly in the active uranium anomaly area is caused by a non-ore fault structure and has nothing to do with deep uranium mineralization, and the active uranium anomaly area is removed.

[0035] In some embodiments, in step S70, if the active uranium anomaly zone is an anomaly zone composed of multiple anomalies and having obvious concentration zoning characteristics, then the active uranium anomaly zone is a favorable area for mineralization.

[0036] In some embodiments, in step S60, the concentration characteristics of the active uranium anomaly zones delineated in the area to be explored are obtained, and the active uranium anomaly zones are classified according to the concentration characteristics. For example, the anomaly zones with obvious concentration zoning characteristics are classified as Class I anomaly zones, and the anomaly zones without obvious concentration zoning characteristics are classified as Class II anomaly zones. The areas covered by Class I anomaly zones and Class II anomaly zones are favorable areas for mineralization, and the Class I anomaly zones with obvious concentration zoning characteristics have greater mineralization potential.

[0037] Regarding the embodiments of the present application, it should also be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other to obtain new embodiments.

[0038] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A geochemical exploration method for hydrothermal concealed uranium deposits, characterized in that: It includes the following steps: S10: Obtain soil samples from the area to be investigated, and prepare a plurality of first soil samples and a second soil sample according to a first particle size and a second particle size; S20: determining the active uranium content of the first soil sample; S30: Determine the total uranium content and cation exchange capacity of the second soil sample; S40: determining the deep active uranium equivalent according to the active uranium content determined in step S20 and the total uranium content and cation exchange capacity determined in step S30; S50: determining the active uranium anomaly zone according to the deep active uranium equivalent determined in step S40; S60: Determine the topography and structure of the area to be investigated and determine the concentration characteristics of the active uranium anomaly area determined in step S50; S70: Determine a favorable mineralization area according to the topography, structure and concentration characteristics determined in step S60; In step S40, the deep active uranium equivalent, the active uranium content determined in step S20, and the total uranium content and cation exchange capacity determined in step S30 conform to the following expressions: , Among them, U c It represents the active uranium equivalent from deep, that is, deep active uranium equivalent, U a represents the active uranium content determined by the S20 step, U b It represents the product of the total uranium content determined in step S30 and the cation exchange capacity determined in step S30.

2. The method according to claim 1, characterized in that: in, The step S50 also includes the following steps: S51: determining the mean value and mean square error of the deep active uranium equivalent, S52: according to a predetermined range determined by the average value and mean square error of the deep active uranium equivalent, data within the predetermined range are eliminated, and a predetermined method is adopted for multiple iterations to determine a final average value, S53: Determine the active uranium anomaly zone according to the final average value.

3. The method according to claim 2, characterized in that In step S52, the predetermined range is: >X1+2S1 and <X1-2S1, Wherein, X1 represents the average value of the deep active uranium equivalent determined by S51, and S1 represents the mean square deviation of the deep active uranium equivalent.

4. The method according to claim 2, characterized in that: In step S52, the predetermined method is to calculate the remaining data in the same manner as the previous calculation based on the previous calculation.

5. The method according to claim 4, characterized in that When there is no data that reaches the predetermined range, the average value of all remaining data outside the predetermined range is the final average value. The active uranium anomaly area meets the following conditions: U c >X n +2S n , Among them, U c is the deep active uranium equivalent, X n is the final average value, S n is the mean square error of all remaining data outside the predetermined range.

6. The method according to claim 1, characterized in that In step S10, a clay-rich sample is collected at a transition point between the weathered rock debris layer and the clay layer.

7. The method according to claim 1, characterized in that In step S70, if the active uranium anomaly zone is located in a low-lying area or a valley, the active uranium anomaly zone is a non-favorable area for mineralization.

8. The method according to claim 1, characterized in that: In step S70, if the active uranium anomaly zone extends along the direction of the fault structure and its morphological trend is consistent with the fault structure, then the active uranium anomaly zone is a non-favorable area for mineralization.

9. The method according to claim 1, characterized in that: In step S70, if the active uranium anomaly zone is an anomaly zone composed of multiple anomalies and having obvious concentrated zoning characteristics, then the active uranium anomaly zone is a favorable area for mineralization.

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