CN115343449A - Method for determining composition of hydrothermal uranium ore mineralization fluid - Google Patents
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Abstract
The application relates to a method for analyzing a geologic body by means of the physical and chemical properties of the geologic body, in particular to a method for determining the components of hydrothermal uranium ore mineralizing fluid, which comprises the following steps: collecting altered rock samples and unaltered rock samples in a hydrothermal uranium mine exploration area; determining the element content of the altered rock sample and the unaltered rock sample; determining the migration condition of each element in the altered rock sample, wherein the migration condition of each element is determined respectively based on the difference of the element content between the altered rock sample and the non-altered rock sample; determining a composition of the mineralizing fluid, wherein elements migrating into the altered rock sample are determined to be the composition of the mineralizing fluid. According to the method for determining the components of the hydrothermal uranium ore mineralization fluid, the primary components of the mineralization fluid can be accurately reflected.
Description
Technical Field
The application relates to a method for analyzing geologic bodies by means of the physical and chemical properties of the geologic bodies, in particular to a method for determining the components of hydrothermal uranium ore mineralization fluid.
Background
The composition of the mineralizing fluid of the keatite is important evidence for determining the formation conditions and the formation mechanism of the keatite, however, the mineralizing fluid can generate various physicochemical reactions in the mineralizing process, so that the composition of the mineralizing fluid in the residual fluid inclusion in the keatite is difficult to reflect the composition of the original mineralizing fluid comprehensively.
Disclosure of Invention
In view of the above problems, the present application is directed to providing a method for determining a composition of a keatite mineralization fluid that overcomes or at least partially solves the above problems.
Embodiments of the present application provide a method of determining a composition of a keatite uranium ore mineralization fluid, including: collecting altered rock samples and unaltered rock samples in a hydrothermal uranium mine exploration area; determining the element content of the altered rock sample and the unaltered rock sample; determining the migration condition of each element in the altered rock sample, wherein the migration condition of each element is determined respectively based on the difference of the element content between the altered rock sample and the non-altered rock sample; determining a composition of the mineralizing fluid, wherein elements migrating into the altered rock sample are determined as components of the mineralizing fluid.
According to the method for determining the components of the hydrothermal uranium ore mineralization fluid, the components of the mineralization fluid can be reflected more accurately.
Drawings
Fig. 1 is a flow chart of a method of determining a composition of a keatite mineralization fluid according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be described below in detail and completely with reference to the accompanying drawings of the embodiments of the present application. It should be apparent that the described embodiment is one embodiment of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the application without any inventive step, are within the scope of protection of the application.
It is to be noted that, unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. If the description "first", "second", etc. is referred to throughout, the description of "first", "second", etc. is used only for distinguishing similar objects, and is not to be construed as indicating or implying a relative importance, order or number of technical features indicated, it being understood that the data described in "first", "second", etc. may be interchanged where appropriate. If "and/or" is presented throughout, it is meant to include three juxtapositions, exemplified by "A and/or B" and including either solution A, or solution B, or both solutions A and B.
Embodiments of the present application provide a method of determining a composition of a keatite uranium ore mineralization fluid, with reference to fig. 1, including:
step S102: and collecting altered rock samples and unaltered rock samples in the hydrothermal uranium mine exploration area.
Step S104: the elemental content of the altered and unaltered rock samples was determined.
Step S106: and determining the migration condition of each element in the altered rock sample. Specifically, the migration of each element can be determined separately based on the difference in element content between the altered and unaltered rock samples.
Step S108: the composition of the mineralizing fluid is determined. Wherein the elements migrating into the altered rock sample are identified as components of an mineralizing fluid of the keatite ore.
In step S102, altered and unaltered rock samples are collected from a uraninite survey area, which may be an area of the uraninite survey area determined by one of ordinary skill in the art to be in need of a uraninite survey according to any suitable means.
The altered rock sample refers to rock formed by water-rock interaction with an ore-forming fluid in a uraninite exploration area, the non-altered rock sample refers to fresh rock which is not altered in the uraninite exploration area, and a person skilled in the art can distinguish the altered rock from the non-altered rock by observing the surface characteristics of the rock and the like, and then collect the altered rock sample and the non-altered rock sample.
Next, in step S106, the element contents of the altered rock sample and the non-altered rock sample need to be determined, and then in step S108, the migration of each element in the altered rock sample is determined by the difference in element contents between the two.
It is understood that the distinction between altered rock and unaltered rock is that the altered rock is subjected to the mineralizing fluid during the mineralizing process of the keatite such that there is a difference in the elemental content of the altered rock and the unaltered rock. In particular, the content of some elements in altered rock is increased compared to the content of the element in non-altered rock, the increase primarily being due to migration of some components of the mineralizing fluid into the altered rock during mineralizing.
Based on the above, the migration of each element in the unaltered rock sample is determined according to the element difference between the altered rock sample and the unaltered rock sample, and the element migrated into the altered rock sample is determined as a component of the mineral-forming fluid.
Since the migration of elements occurs during the mineralization process, the methods provided by the embodiments of the present application are able to more accurately reflect the primary constituents of the mineralization fluid than methods provided by the related art in the field.
In some embodiments, determining the migration condition of each element in step S108 may be implemented by determining the migration parameter M of each element in the altered rock sample, and specifically, the migration parameter M may be calculated by the following formula (1).
M=（C 1 -C 0 ）/C 0 Formula (1)
Wherein, C 1 To alter the content of an element in a rock sample, C 0 For the content of the element in the non-altered rock sample, the element is considered to migrate into the altered rock sample when the migration parameter M is greater than 0. The migration condition of each element can be judged more accurately and efficiently by the formula (1), and the migration parameter M calculated by the formula (1) can also indicate the confidence of judgment of the migration condition of the element to a certain extent, and the higher the value is, the higher the probability of migration of the element can be considered.
In some embodiments, a altered zone in a uraninite survey area may be determined while collecting altered and unaltered rock samples; and then continuously collecting a plurality of rock samples on the section of the altered zone, wherein the plurality of rock samples comprise altered rock samples and non-altered rock samples. Specifically, the altered rock sample may be taken from the edge to the center of the cross-section of the altered zone, while the non-altered rock sample may be taken outside the altered zone.
In such embodiments, determining the migration of each element in the altered rock sample may specifically include: and determining the comprehensive migration condition of each element on the section. Determining the combined migration of the element across the profile by a plurality of altered rock samples distributed successively over the altered zone can increase accuracy compared to determining the migration of the element using only the element content in one altered rock sample.
In some embodiments, the comprehensive migration condition of the elements on the section of the altered zone can be determined by respectively determining a comprehensive migration parameter N of each element, wherein the comprehensive migration parameter N is the sum of the migration parameters of a plurality of altered rock samples, and specifically, the comprehensive migration parameter N can be calculated by adopting the following formula (2).
N=M 1 +M 2 +…M n Formula (2)
Wherein, M 1 -M N For the migration parameter M of each of the acquired n rock samples, the migration parameter M may be calculated by using the above formula (1), and when the migration parameter M of each of the n rock samples is calculated, the migration parameter M may be calculated by using the element content of the same non-altered rock sample, or may be calculated by selecting the element content of different non-altered rock samples, which is not limited in this respect. In some other embodiments, the comprehensive migration parameter N may be calculated by using other calculation formulas, for example, an average value, an arithmetic average value, and the like of the migration parameters M of the plurality of altered rock samples are used as the comprehensive migration parameter N, and details thereof are not described herein again.
After calculating the comprehensive migration parameter N using the above formula (2), if the comprehensive migration parameter N of an element is greater than a preset value, it can be considered that the element migrates into the altered rock sample. It can be understood that the higher the preset value is, the higher the accuracy is, but it is also certain that some components are missed, and the preset value is determined by those skilled in the art according to actual needs, and is not limited thereto.
In some embodiments, in determining the elemental content of the altered rock sample and the unaltered rock sample, the major elemental content and the minor elemental content of the altered rock sample and the unaltered rock sample, respectively, may be determined. In such embodiments, the primary quantity of elements migrating into the altered rock sample is determined as the primary quantity of components of the mineralizing fluid and the trace elements migrating into the altered rock sample are determined as the trace components of the mineralizing fluid when the mineralizing fluid components are determined.
In the prior art, there are differences in the content analysis methods for the major elements and the trace elements, for example, an X-ray fluorescence spectrometer is usually used to measure the major elements, and a mass spectrometer is used to measure the trace elements, and for this reason, the major elements and the trace elements are measured separately in this embodiment, so as to ensure the efficiency and accuracy of the measurement. The specific differentiation standard of the major elements and the trace elements can refer to relevant standards in the field, and is not described in detail herein.
It can be understood that, although the components of the mineralizing fluid remaining in the fluid inclusion in the keatite are difficult to fully reflect the primary components of the mineralizing fluid, on the basis that the components of the mineralizing fluid have been determined based on the element migration condition in the present application, the components determined based on the element migration can be supplemented and verified well, further improving the accuracy and comprehensiveness of the result, and on the other hand, the phases of some components in the mineralizing fluid can be further determined based on the element migration, which cannot be determined.
Specifically, in some embodiments, gangue minerals associated with keatite in a keatite exploration area may be collected and a sheet sample may be prepared, the gangue minerals including at least quartz, fluorite, and calcite, and fluid inclusions in the sheet sample may then be subjected to laser raman analysis, and a gas phase component, a liquid phase component, and a solid phase component of the mineralised fluid may be determined based on the results of the laser raman analysis.
The fluid of the keatite ore usually remains in the fluid inclusion of the gangue minerals, so in this embodiment, the gangue minerals symbiotic with the keatite ore are collected to prepare a sheet-shaped sample, and then the gas phase, solid phase and liquid phase components in the sheet-shaped sample are determined by means of laser raman spectroscopy and are used as the gas phase component, solid phase component and liquid phase component of the fluid of the ore. The sheet sample herein refers to a fluid inclusion sheet sample, and the preparation of the fluid inclusion sheet and the laser raman spectroscopy analysis can be completed by those skilled in the art by referring to relevant test standards in the field.
In some embodiments, when performing laser raman analysis on fluid inclusions in a sheet-like sample, a plurality of fluid inclusions may be first defined in the sheet-like sample, and the defined plurality of fluid inclusions includes at least a fluid inclusion in quartz, a fluid inclusion in fluorite, and a fluid inclusion in calcite, so as to ensure the comprehensiveness of the analysis result, and then laser raman analysis may be performed on each of the defined fluid inclusions, respectively.
In some embodiments, when a plurality of fluid inclusions are defined in the sheet sample, it is necessary to define within a predetermined depth range of the sheet sample, which may be determined with reference to parameters of the laser raman spectrum used to ensure accuracy of the analysis results.
In some embodiments, gangue minerals symbiotic with the keatite in the keatite exploration area may be further collected and granular monomineral samples may be prepared, and then the granular monomineral samples may be subjected to ion composition analysis. In such embodiments, the ionic composition of the mineralizing fluid may be determined based on the results of the ionic composition analysis.
It will be appreciated that the ionic composition of the mineralised fluid is more difficult to determine, whether by elemental migration or by laser raman spectroscopy, for which reason gangue minerals associated with keatite ore may be further collected and prepared into particulate monomineral samples which may then be subjected to ionic composition analysis to determine the ionic composition of the mineralised fluid. In this embodiment, granular single mineral samples of quartz, fluorite, and calcite need to be prepared separately to ensure comprehensiveness and accuracy of analysis results.
In some embodiments, performing an ion composition analysis on a particulate single mineral sample may specifically include: releasing ionic components in fluid inclusions of the particulate single mineral sample using a bursting process; the ion components were analyzed for ion composition by ion chromatography. The bursting method can effectively release ionic components in each fluid inclusion in the powdery sample, thereby completing the analysis of the ionic components.
The method of one or more of the above-referenced embodiments is described and supplemented in greater detail below with the determination of mineralizing fluid fractions as carried out in uranium deposits in the phase mountain uranium mines.
Firstly, through field investigation, the system collects gangue minerals, altered rock samples and unaltered rock samples in a hydrothermal uranium mine exploration area, wherein the size of the samples is generally 3 x 6 x 9cm, each type of sample is not less than 5 blocks, and the weight of the sample is not less than 0.5kg, so as to smoothly obtain a single mineral sample required by the composition research of an ore-forming fluid.
Zhoushan deposits were located in the west of the Yanjiashan uranium deposit, at the north end of the Zhoushan-cave crumple zone, the mineralized zone being mainly found in the crushed mottled rhyolite of the Chalk-Shi lake ridge. On the basis of detailed field geological survey, samples of typical rock ores of the Zhoujia uranium deposit are collected, wherein the samples comprise fresh crushed schlieren rhyolitic rocks at the periphery of the deposit, crushed schlieren rhyolitic rocks and uranium ores which are corroded and changed beside an ore body. In order to develop the research on the migration of the components of the altered rock, 4 rock samples with different alteration degrees are collected, namely mineralized central broken plaque rhyolite, nearby strong altered broken plaque rhyolite, distant ore weak altered broken plaque rhyolite and fresh broken plaque rhyolite, wherein the fresh broken plaque rhyolite is an unaltered rock sample, and the rest three rock samples are altered rock samples. In addition, 3 samples of ore and gangue minerals were collected for preparing the flake and powder samples.
The collected sample is then processed and prepared for subsequent analytical testing.
The collected altered and unaltered rock samples were processed and prepared using a contamination free protocol. Firstly, coarsely crushing the mixture to 2 to 3mm by using a corundum jaw crusher, and mixing the mixture uniformly. Then, the sample was fractionated, and about 50g was taken as a side sample. And (3) taking 100g of the sample, and finely grinding the sample to be less than 200 meshes by using an agate ball mill to obtain an analysis test sample, wherein the weight of the element content analysis test sample is not less than 50g. After each sample is crushed, the container is strictly cleaned and cleaned by alcohol, and then the next sample can be crushed, so that the samples are ensured not to be subjected to cross contamination and the analysis result of the element content is influenced.
Some of the collected gangue mineral samples were prepared into flake samples. Firstly, a marker pen is used for determining the range of an ore sample, a part where the ore mineral and the gangue mineral are developed and closely symbiotic is selected, a wrapping body piece is ground, the thickness of the wrapping body piece is 0.05-0.08mm, the two sides of the wrapping body piece are polished, 502 glue is used for adhering the piece, and at least 3 wrapping body pieces are ground for each sample.
The other collected gangue mineral samples are prepared into granular single mineral samples. Firstly, crushing gangue mineral samples by using a pair roller and a jaw crusher, then screening the crushed samples by using a standard sieve, screening the crushed samples by using a standard sieve with an 80-mesh target, finely picking the samples under a binocular stereoscope after screening, selecting quartz, calcite and fluorite single mineral samples, and removing impurity minerals, wherein the purity of the single mineral should reach more than 99%, and the weight of each single mineral sample should reach 5g.
Next, elemental content analysis was performed on the altered rock samples and the unaltered rock samples, specifically, content determination of the principal component element was performed by means of an X-ray fluorescence spectrometer. The determination of the content of the trace elements is carried out by means of a mass spectrometer. The results of measuring the contents of the major and minor elements are shown in tables 1 and 2, in which V033, V034 and V036 are altered rock samples and V038 is an unaltered rock sample.
TABLE 1 Main element content (. Times.10) -6 ）
TABLE 2 microelement content (x 10) -6 ）
The migration parameter M of each of the major elements and the minor elements described above was calculated separately using the formula (1) described above, and the migration parameters M of the three samples were summed up to the integrated migration parameter. The calculation results are shown in tables 3 and 4.
TABLE 3 calculation of the principal component element migration parameter M
TABLE 4 results of calculation of microelement migration parameter M
Based on the above results, it was determined that the main major elemental components carried in the ore-forming fluid were Si, al, fe, mn, ca, na, ti, P, H 2 O, the main trace element component is Sr, sc, cu, pb, zn, mo, W, ni, bi, sb, zr, hf, nb, th, U, S and F.
And then observing the sheet sample under a microscope, selecting a 20-time or 50-time objective lens, lifting or lowering the lens barrel so as to observe the characteristics of inclusions at different depths, using a marking pen to circle the concentrated or developed part of the inclusions, and testing the development depth of the inclusions to be proper so as to avoid the influence of over-depth or over-shallow on laser Raman analysis.
Sending the well-defined package piece to a laser Raman spectrometer for in-situ analysis, wherein the minimum diameter of an analysis laser beam spot is 1 mu m, and the Raman shift range is 0-4000 cm -1 Resolution of 1 to 2cm -1 To ensure accurate acquisition of fluid inclusion composition. And performing in-situ laser Raman spectrum analysis on gas phase, liquid phase and solid phase components in all gangue minerals, and comparing with a standard component spectrum curve to determine the gas phase, liquid phase and solid phase components of the mineral-forming fluid.
The results indicate the presence of CO in the fluid inclusions of hydrothermal uranium deposits in Zhoushan mountains 2 、HCO 3 － 、HF、H 2 S、Cl 2 、F、CH 4 、C 3 H 6 、C 4 H 6 、SO 2 、CO、N 2 、OH － And the like, in addition to which solid phase pyrite may be present.
Then, the granular monomineral sample is subjected to ion component analysis, and the result shows that the ionic component of the mineralizing fluid of the uranium deposit in the Zhoushan is mainly Na + 、K + 、Mg 2+ 、Ca 2+ 、F - 、Cl - 、NO 3 - 、SO 4 2- 。
By combining the above, the main element composition in the ore-forming fluid is finally determined to be Si, al, fe, mn, ca, na, ti, P and H 2 O, trace elements mainly comprising Sr, sc, cu, pb, zn, mo, W, ni, bi, sb, zr, hf, nb, th, U, S and F, and anions or elements forming ion groups mainly comprising N 2 、CO 2 、CO、HCO 3 - 、F、Cl、H 2 S and CH 4 、C 3 H 6 、C 4 H 6 。
The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the examples, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. The prior art can be adopted in the content which is not described in detail in the invention.
Claims (11)
1. A method of determining a composition of a keatite uranium ore mineralization fluid, comprising:
collecting altered rock samples and non-altered rock samples in a uraninite exploration area;
determining the elemental content of the altered rock sample and the unaltered rock sample;
determining a migration profile of each element in the altered rock sample, wherein the migration profile of each element is determined separately based on a difference in element content between the altered rock sample and the unaltered rock sample;
determining a composition of the mineralizing fluid, wherein elements migrating into the altered rock sample are determined as components of the mineralizing fluid.
2. The method of claim 1, wherein the determining the migration of each element in the altered rock sample comprises:
separately determining the migration of each element in the altered rock sampleParameter M, the migration parameter M = (C) 1 -C 0 ）/C 0 Wherein, C 1 Is the elemental content, C, of the altered rock sample 0 And considering the element content of the non-altered rock sample, and when the migration parameter M is greater than 0, considering that the elements migrate into the altered rock sample.
3. The method of claim 1, wherein the collecting altered and unaltered rock samples in a keatite exploration area comprises:
determining altered zones in the keatite uranium ore exploration area;
continuously collecting a plurality of rock samples over a cross-section of the altered zone, the plurality of rock samples including the altered rock sample and the unaltered rock sample;
the determining the migration condition of each element in the altered rock sample comprises:
and determining the comprehensive migration condition of each element on the section.
4. The method of claim 3, wherein said determining a composite migration of each element across the profile comprises:
and respectively determining a comprehensive migration parameter N of each element, wherein the comprehensive migration parameter N is the sum of the migration parameters of a plurality of altered rock samples.
5. The method of claim 4, wherein an element is deemed to migrate into the altered rock sample when the integrated migration parameter N is greater than a preset value.
6. The method of claim 1, wherein the determining the elemental content of the altered and unaltered rock samples comprises:
determining the major element content and the trace element content of the altered rock sample and the unaltered rock sample;
the determining the composition of the mineralizing fluid comprises:
determining a major amount of elements migrating into the altered rock sample as a major amount of the constituent of the mineralizing fluid and determining a minor amount of elements migrating into the altered rock sample as a minor amount of the constituent of the mineralizing fluid.
7. The method of claim 1, further comprising:
collecting gangue minerals symbiotic with the keatite in the keatite exploration area and preparing a flaky sample, wherein the gangue minerals at least comprise quartz, fluorite and calcite;
performing laser Raman analysis on fluid inclusions in the sheet sample;
the determining the composition of the mineralizing fluid comprises:
determining a gas phase component, a liquid phase component, and a solid phase component of the mineralizing fluid based on the results of the laser Raman analysis.
8. The method of claim 7, wherein performing laser Raman analysis on fluid inclusions in the sheet sample comprises:
enclosing a plurality of fluid inclusions in the sheet-like sample, the enclosed plurality of fluid inclusions comprising at least fluid inclusions in quartz, fluid inclusions in fluorite, and fluid inclusions in calcite;
laser raman analysis is performed separately for each of the delineated fluid inclusions.
9. The method of claim 8, wherein enclosing a plurality of fluid inclusions in the sheet-like sample comprises:
and circling a plurality of fluid inclusions in the preset depth range of the sheet-shaped sample.
10. The method of claim 1 or 7, further comprising:
collecting gangue minerals symbiotic with the uranite in the uranite exploration area and preparing granular monomineral samples, wherein the gangue minerals at least comprise quartz, fluorite and calcite;
performing an ion composition analysis on the particulate single mineral sample;
the determining the composition of the mineralizing fluid comprises:
determining an ionic component of the mineralizing fluid based on the ionic component analysis results.
11. The method of claim 10, wherein the performing an ion composition analysis on the particulate single mineral sample comprises:
releasing ionic components in the fluid inclusions of the particulate single mineral sample using a decrepitation process;
ion composition analysis of the ion component was performed by means of ion chromatography.
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