CN115099363B - Method for identifying sandstone uranium ore mineralization fluid action type - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 28
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- 230000001089 mineralizing effect Effects 0.000 claims abstract description 49
- 239000000203 mixture Substances 0.000 claims abstract description 28
- 239000000126 substance Substances 0.000 claims abstract description 20
- 239000005416 organic matter Substances 0.000 claims abstract description 12
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- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 11
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- 238000007710 freezing Methods 0.000 claims description 12
- 230000008014 freezing Effects 0.000 claims description 12
- 239000010453 quartz Substances 0.000 claims description 12
- 238000009933 burial Methods 0.000 claims description 10
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 10
- 239000011707 mineral Substances 0.000 claims description 10
- 229910021532 Calcite Inorganic materials 0.000 claims description 8
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 8
- 239000010428 baryte Substances 0.000 claims description 8
- 229910052601 baryte Inorganic materials 0.000 claims description 8
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 claims description 8
- 229910052683 pyrite Inorganic materials 0.000 claims description 8
- 239000011028 pyrite Substances 0.000 claims description 8
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 229910052961 molybdenite Inorganic materials 0.000 claims description 3
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052950 sphalerite Inorganic materials 0.000 claims description 3
- 238000002386 leaching Methods 0.000 claims 2
- 238000005136 cathodoluminescence Methods 0.000 claims 1
- 229910052949 galena Inorganic materials 0.000 claims 1
- XCAUINMIESBTBL-UHFFFAOYSA-N lead(ii) sulfide Chemical compound [Pb]=S XCAUINMIESBTBL-UHFFFAOYSA-N 0.000 claims 1
- 239000000523 sample Substances 0.000 description 33
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- YIIYNAOHYJJBHT-UHFFFAOYSA-N uranium;dihydrate Chemical compound O.O.[U] YIIYNAOHYJJBHT-UHFFFAOYSA-N 0.000 description 3
- -1 blende Chemical compound 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
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- 239000010931 gold Substances 0.000 description 2
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- GGYFMLJDMAMTAB-UHFFFAOYSA-N selanylidenelead Chemical compound [Pb]=[Se] GGYFMLJDMAMTAB-UHFFFAOYSA-N 0.000 description 2
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- WGPCGCOKHWGKJJ-UHFFFAOYSA-N sulfanylidenezinc Chemical compound [Zn]=S WGPCGCOKHWGKJJ-UHFFFAOYSA-N 0.000 description 2
- 229910052984 zinc sulfide Inorganic materials 0.000 description 2
- 206010015856 Extrasystoles Diseases 0.000 description 1
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- 238000003556 assay Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/04—Investigating osmotic effects
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
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Abstract
The application relates to a method for analyzing a geologic body by means of physical and chemical properties of the geologic body, in particular to a method for identifying the action type of sandstone uranium ore mineralization fluid, which comprises the following steps: collecting a uranium ore sample in sandstone uranium ore; determining the composition, uniform temperature and salinity of fluid inclusions in a uranium ore sample; and identifying the action type of the mineralizing fluid of the sandstone uranium ore, wherein if the component of the fluid inclusion in the uranium ore sample is determined to comprise hydrocarbon organic matter and/or carbon, the uniform temperature is greater than a first preset value, and the salinity is greater than a second preset value, the action type of the mineralizing fluid of the sandstone uranium ore is identified as the action of the exuded mineralizing fluid. According to the method for identifying the mineralizing fluid of the sandstone uranium ore, whether the mineralizing fluid action type of the sandstone uranium ore is the action of the exudation mineralizing fluid can be accurately and effectively identified, and a basis is further provided for judging whether the sandstone uranium ore is the exudation type sandstone uranium ore.
Description
Technical Field
The application relates to a method for analyzing a geologic body by means of physical and chemical properties of the geologic body, in particular to a method for identifying the action type of an ore-forming fluid of sandstone uranium ore.
Background
The action type of the mineralizing fluid of the exudation type sandstone uranium ore is the action of the exudation mineralizing fluid, the exudation mineralizing fluid is a reducing fluid which is exuded at a deep part and is rich in organic matters and mineralizing matters, the mineralizing fluid of the exudation type sandstone uranium ore is a superficial mineralizing fluid which is infiltrated at a shallow part and is rich in uranium and oxygen, the properties of the reducing fluid and the superficial mineralizing fluid are greatly different, and the identification of the exudation type sandstone uranium ore can be realized by identifying the action of the exudation mineralizing fluid, so that a method for effectively identifying whether the action type of the mineralizing fluid of the exudation type sandstone uranium ore is the action of the exudation mineralizing fluid is urgently needed.
Disclosure of Invention
In view of the above, the present application has been developed to provide a method of identifying the mineralisation fluid effect type of a sandstone uranium ore that overcomes, or at least partially addresses, the above-mentioned problems.
An embodiment of the application provides a method for identifying an mineralizing fluid effect type of a sandstone uranium ore, which comprises the following steps: collecting a uranium ore sample in sandstone uranium ore; determining the composition, uniform temperature and salinity of fluid inclusions in a uranium ore sample; and identifying the action type of the mineralizing fluid of the sandstone uranium ore, wherein if the component of the fluid inclusion in the uranium ore sample is determined to comprise hydrocarbon organic matter and/or carbon, the uniform temperature is greater than a first preset value, and the salinity is greater than a second preset value, the action type of the mineralizing fluid of the sandstone uranium ore is identified as the action of the exuding mineralizing fluid.
According to the method for identifying the ore-forming fluid of the sandstone uranium ore, whether the action type of the ore-forming fluid of the sandstone uranium ore is the action of the exudation ore-forming fluid can be accurately and effectively identified, and a basis is further provided for judging whether the sandstone uranium ore is the exudation type sandstone uranium ore.
Drawings
Fig. 1 is a flow chart of a method of identifying an mineralizing fluid effect type for a sandstone uranium ore according to an embodiment of the application;
FIG. 2 is a histogram of a uniform temperature distribution according to an embodiment of the present application;
FIG. 3 is a schematic diagram of the corresponding distribution of uniform temperature and salinity according to an embodiment of the present application;
FIG. 4 is a back-scattered electron image of a uranium ore sample according to an embodiment of the present application;
fig. 5 is a polarization microscope image of a uranium ore sample 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 inventive effort, 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 one 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.
An embodiment of the present application provides a method of identifying a primary cause of oxidation build, referring to fig. 1, including:
step S102: collecting a uranium ore sample in sandstone uranium ore.
Step S104: the composition, uniform temperature and salinity of fluid inclusions in a uranium ore sample are determined.
Step S106: an mineralizing fluid of a sandstone uranium ore is identified. And if the composition of the fluid inclusion in the uranium ore sample is determined to comprise hydrocarbon organic matter and/or carbon, the uniform temperature is greater than a first preset value, and the salinity is greater than a second preset value, identifying the action type of the ore forming fluid of the sandstone uranium ore as the effect of the exudation ore forming fluid.
In step S102, a uranium ore sample is first collected from a sandstone uranium ore, and then the composition, uniform temperature, and salinity of fluid inclusions in the uranium ore sample are determined in step S104.
During the growth of the ore body, part of the mineralizing fluid is captured and wrapped in the ore body to form fluid inclusions, and the properties of the mineralizing fluid can be determined by means of the fluid inclusions. The state of the mineralized fluid when captured is determined by the pressure and temperature of the capture, but after being captured, the mineralized fluid will present various phase states, generally including gas, liquid and solid three states, along with the reduction of the temperature and the pressure.
To determine the composition, uniform temperature and salinity of fluid inclusions in a uranium ore sample, the uranium ore sample may be prepared as fluid inclusion sheets, which may be prepared by one skilled in the art with reference to relevant test standards in the art. By way of example, the collected uranium ore sample can be cut, ground and polished to produce a double-side polished fluid-encapsulated sheet, and the thickness can be controlled to be about 100 μm.
The determination of the composition, homogeneous temperature and salinity of the fluid inclusions can be accomplished by one skilled in the art by selecting an appropriate determination method according to the actual situation and referring to relevant determination criteria. Several assay methods will also be described in detail in the relevant sections below, and will not be described in detail here.
The inventors of the present application propose that the exudation mineralizing fluid of exudation type sandstone uranium ores is generally rich in organic matter and relatively high in uniform temperature and salinity compared to the surface fluid of exudation type sandstone uranium ores, and therefore, if it is determined in step S104 that the composition of the fluid inclusion includes hydrocarbon organic matter and/or carbon, the uniform temperature is greater than a first preset value, and the salinity is greater than a second preset value, it is possible to identify the action type of the mineralizing fluid of sandstone uranium ores as an exudation mineralizing fluid action. The first preset value and the second preset value may be determined by those skilled in the art according to actual conditions, for example, geological conditions such as buried history and geothermal history in the region where sandstone uranium ore is located, or related data in common surface-generated fluid may be referred to for determination, and the like, as long as the first preset value and the second preset value can reasonably distinguish the exudation ore-forming fluid from the surface-generated fluid.
According to the method for identifying the ore-forming fluid of the sandstone uranium ore, whether the action type of the ore-forming fluid of the sandstone uranium ore is the exudation ore-forming fluid can be accurately identified, and a basis is provided for judging whether the sandstone uranium ore is the exudation sandstone uranium ore.
In some embodiments, the first preset value may be determined based on a maximum burial depth temperature in sandstone uranium deposit mineralization. Specifically, the maximum burial depth temperature in the mineralization is the maximum burial depth temperature experienced by the uranium reservoir of the sandstone uranium ore in the diagenetic action, and the maximum burial depth temperature may be determined based on the burial history, geothermal history and the like in the region, and then the first preset value is determined based on the maximum burial depth temperature, and specifically, the first preset value is at least a value greater than or equal to the maximum burial depth temperature.
In some embodiments, the second preset value may be determined based on the salinity of the epigenetic fluid, where the salinity of the epigenetic fluid may refer to an average distribution range of the salinity of the epigenetic fluid of the sandstone uranium ore, and one skilled in the art can obtain the salinity of the epigenetic fluid according to related technical data to determine the second preset value, specifically, the second preset value is at least a value equal to or greater than the salinity of the epigenetic fluid.
In some embodiments, when collecting uranium ore samples in step S102, a uranium content greater than 100 x 10 may be collected -6 The uranium ore as uranium ore sample, understandably, the uranium content is higher relatively means that the ore-forming fluid is also enriched relatively, finds more typical fluid inclusion in the uranium ore sample more easily to improve the efficiency of discernment.
In the actual operation process, the uranium content can be measured by an instrument when a uranium ore sample is collected, for example, an X-ray fluorescence instrument, so that the uranium content greater than 100 multiplied by 10 can be identified and selected -6 The uranium ore of (a) is used as a uranium ore sample.
In some embodiments, in determining the composition, uniform temperature, and salinity of fluid inclusions in a uranium ore sample in step S104, a contemporaneous standard of a sandstone uranium ore may first be determined. The contemporary standard substance can comprise minerals and/or organic matters symbiotic with sandstone uranium ores, and common minerals symbiotic with sandstone uranium ores can comprise pyrite, sphalerite, selenium lead ore and the like.
Next, fluid inclusions intergrown with sandstone uranium ore and/or a contemporary standard can be delineated, and the composition, uniform temperature, and salinity of the fluid inclusions intergrown with sandstone uranium ore and/or a contemporary standard can be determined.
It will be appreciated that in addition to the mineralizing fluids of sandstone uranium ores being able to form fluid inclusions, other fluids are also able to form fluid inclusions, and that in order to more efficiently and accurately identify mineralizing fluids, it is necessary to screen out the fluid inclusions that have been wrapped with mineralizing fluids for analysis.
In the embodiment, fluid inclusions symbiotic with sandstone uranium ores and/or contemporary standards are identified, and the fluid inclusions are formed in the mineralization period of the sandstone uranium ores and are likely to be wrapped by mineralization fluid, so that the identification efficiency can be improved.
In addition, it can be understood that the contemporary standard objects and the sandstone uranium ores have symbiotic relationship and are formed under the action of the same mineralizing fluid with high possibility, so that the fluid inclusion symbiotic with the contemporary standard objects has high possibility of being wrapped with the mineralizing fluid, and therefore, in the embodiment, not only the fluid inclusion directly symbiotic with the sandstone uranium ores can be defined, but also the fluid inclusion symbiotic with the contemporary standard objects can be defined, so that the fluid inclusion wrapped with the mineralizing fluid can be identified more efficiently.
In another aspect, the contemporary markers may also reflect some properties of the mineralizing fluid of sandstone uranium ore to some extent, and thus, in some embodiments, the identified contemporary markers may be used to identify the mineralizing fluid in addition to the confining fluid enclosure, and the following relevant portions will describe the embodiments in more detail and will not be described here.
In some embodiments, the identification of the contemporaneous marker can be directly performed in the fluid inclusion sheet, and the specific type of the uranium ore body in the fluid inclusion sheet and the specific composition and occurrence form of a substance closely symbiotic with the uranium ore body can be determined by means of a non-destructive analysis technology such as a polarization microscope, a laser raman spectrometer, an infrared spectrometer and the like, so as to complete the identification of the contemporaneous marker. When judging whether the substances have a symbiotic relationship with the sandstone uranium ore, different judgment standards and judgment methods can be adopted for different types of substances, and a person skilled in the art can complete judgment according to actual conditions without limitation.
In some embodiments, for some substances that are difficult to define by the above-mentioned nondestructive analysis techniques, the analysis may be performed by a semi-quantitative analysis technique such as a scanning electron microscope, an electron probe, and the like, specifically, the positions of the difficult-to-define substances may be marked, and then the fluid parcel sheets may be gold-coated, and after drying in the shade, the marked positions may be analyzed by a scanning electron microscope and an electron probe.
In some other embodiments, the uranium ore sample may be prepared into other forms of samples, such as optical sheets, bulk samples, etc., and analyzed in other suitable ways to identify contemporaneous standards, which are not described in detail herein.
In some embodiments, in delineating fluid inclusions intergrowth with sandstone uranium ores and/or contemporary standards, fluid inclusions intergrowth with sandstone uranium ores and/or contemporary standards may be delineated based on the stage and type of fluid inclusions in the fluid inclusion sheet, in particular, fluid inclusion types in different stage diagenetic minerals in a uranium ore sample may be first specified, which may include pure liquid phase brine inclusions, liquid phase-rich brine inclusions, gas phase-rich brine inclusions, pure gas phase inclusions, oil and gas inclusions, and the like. And then, according to the formation periods of the sandstone uranium ores and the synchronous standard substances, identifying synchronous fluid inclusions symbiotic with the sandstone uranium ores and/or the synchronous standard substances in different-period diagenetic minerals.
In some embodiments, the type of fluid inclusion may be determined by means of analytical equipment, such as polarization microscopes, fluorescence microscopes, and the like.
In some embodiments, when determining the composition, the uniform temperature, and the salinity of the fluid inclusions in the uranium ore sample in step S104, the uniform temperature of the fluid inclusions at different locations may be determined separately; and determining whether the uniform temperature of the fluid inclusion is greater than a first preset value or not based on the uniform temperature distribution condition of the fluid inclusion.
That is, after the fluid inclusions symbiotic with the sandstone uranium ore and/or the contemporary standard are defined, fluid inclusions distributed at different positions may be further defined as a subsequent analysis target in the defined fluid inclusions. In this embodiment, the different positions mainly refer to fluid inclusions existing in different gangue minerals, and the different existing positions cause the fluid inclusions to have a certain difference in uniform temperature, so that the uniform temperatures of the fluid inclusions at the different positions need to be respectively measured, and whether the uniform temperature of the fluid inclusions is greater than a first preset value or not is comprehensively determined based on the distribution of the uniform temperatures, so as to ensure the accuracy of the identification result.
In some embodiments, the fluid inclusions at the different locations include at least secondary fluid inclusions distributed in the sandstone scrap quartz, and primary fluid inclusions distributed in the mineralizing contemporaneous calcite or barite. The secondary fluid inclusions are formed after the formation of sandstone clastic quartz, it being understood that the uranium mineralization is generally after clastic quartz, and therefore the secondary fluid inclusions formed after clastic quartz formation are more likely to be formed contemporaneously with the sandstone uranium ore, and therefore the secondary fluid inclusions in clastic quartz should be selected. The primary fluid inclusion is formed contemporaneously with calcite or barite, which is typically formed contemporaneously with sandstone uranium ores, and therefore, the primary fluid inclusion in calcite or barite should be selected.
In some embodiments, the uniform temperature of different types of fluid inclusions at each location may be further separately measured and statistically analyzed to further ensure the accuracy of the identification results.
A histogram of the uniform temperature distribution of different locations and types of fluid inclusions determined in one embodiment is shown in fig. 2, where the abscissa indicates the uniform temperature and the ordinate indicates the number of fluid inclusions falling within the temperature range, where color clumps 21 indicate primary brine inclusions in mineralised contemporaneous calcite/barite, color clumps 22 indicate secondary brine inclusions in clastic quartz, and color clumps 23 indicate secondary oil inclusions in clastic quartz. In this embodiment, the uniform temperature of the brine inclusion is mainly distributed in two temperature ranges of 90 to 110 ℃ and 130 to 150 ℃, the uniform temperature of the oil inclusion is intensively distributed in 120 to 150 ℃, and the first preset value determined based on the maximum burial depth temperature in the mineralization in this embodiment is about 60 ℃, so that it is finally determined that the uniform temperature of the fluid inclusion in the uranium ore is greater than the first preset value.
In some embodiments, determining the composition, uniform temperature, and salinity of the fluid inclusions in the uranium ore sample in step S104 may further include: respectively measuring the freezing point temperatures of the fluid inclusions at different positions; determining the salinity of the fluid inclusion based on the freezing point temperature of the fluid inclusion; determining whether the salinity of the fluid inclusions is greater than a second preset value based on the salinity of the fluid inclusions and the corresponding uniform temperature.
Similar to the embodiments described above, the determination of salinity in this embodiment is also done separately for fluid inclusions at different locations. In the salinity measuring process, the freezing point temperatures of the fluid inclusion at different positions can be measured firstly, then the salinity of the fluid inclusion is determined based on the freezing point temperatures, the corresponding distribution relation between the salinity of the fluid inclusion and the uniform temperature is obtained, and whether the salinity of the fluid inclusion is larger than a second preset value or not can be determined based on the corresponding distribution relation.
The advantage of obtaining the corresponding distribution relationship between the salinity and the uniform temperature of the fluid inclusions is that the salinity corresponding to the fluid inclusions with significant deviation of the uniform temperature can be excluded from the analysis range, and the interference to the analysis result can be avoided. Similarly, in some other embodiments, the homogeneous temperature may be analyzed to exclude from the analysis the homogeneous temperature for fluid inclusions having salinity that deviates significantly.
A schematic diagram of the corresponding distribution of salinity versus homogeneous temperature in the fluid inclusions obtained in one embodiment is shown in fig. 3, where the abscissa is homogeneous temperature and the ordinate is salinity, the circular points 31 indicate secondary fluid inclusions distributed in clastic quartz, and the triangular points 32 indicate primary fluid inclusions distributed in mineralised contemporaneous calcite or barite. In the embodiment, the salinity of the fluid inclusion is intensively distributed between 5% and 10% NaCleq which is obviously higher than that of the common surface fluid, so that the salinity of the fluid inclusion in the embodiment is considered to be larger than a second preset value.
In some embodiments, when determining the composition of the fluid inclusions in the uranium ore sample in step S104, the inclusion composition may be qualitatively analyzed by measuring the gas, liquid, and solid phase composition in the inclusions using a micro laser raman spectrometer or a micro infrared spectrometer. Similarly, when the composition of the fluid inclusions is measured, the composition of the fluid inclusions at different positions may be measured separately.
As described above, the particular type of contemporaneous marker may be used to assist in identifying an mineralizing fluid, and in particular, in some embodiments, if it is determined that the contemporaneous marker comprises mobile organic matter, and the composition of the fluid inclusions in the uranium ore sample comprises hydrocarbon organic matter and/or carbon, the homogeneous temperature is greater than a first predetermined value, and the salinity is greater than a second predetermined value, then identifying the mineralizing fluid effect type for the sandstone uranium ore as a exudation mineralizing fluid effect.
The mobile organic matter herein may include bitumen, liquid hydrocarbons (typically in the form of oil and gas inclusions), humic acids, and the like. Fig. 4 shows an image of a uranium ore sample under a fluorescence microscope in one embodiment, in which the presence of intense blue fluorescence (colour not shown) within the region shown in box 41 is visible, indicating the presence of liquid hydrocarbon material.
In some embodiments, additionally or alternatively, if it is determined that the contemporaneous standard comprises at least one of pyrite, blende, and molybdenite, and the composition of fluid inclusions in the uranium ore sample comprises hydrocarbon organic matter and/or carbon, the homogeneous temperature is greater than a first predetermined value, and the salinity is greater than a second predetermined value, then identifying the mineralization fluid effect type for the sandstone uranium ore as a exudation mineralization fluid effect.
Fig. 5 shows a back-scattered electron image of a uranium ore sample obtained in an example, where pyrite 52 is distributed around a uranium ore 51, and there is a close symbiotic relationship between the two.
One or more of the embodiments referred to above are described and supplemented in greater detail below with the identification of mineralizing fluids carried out by the inventors on uranium deposits from dicne hadamard maps as an example.
Firstly, through field geological investigation, the output states of standard substances such as organic matters, pyrites and the like are recorded, and uranium ore samples in outcrop/drill holes are collected.
Next, the collected uranium ore sample is subjected to fluid inclusion sheet preparation by a pollution-free scheme, and the fluid inclusion sheet is firstly cut into blocks of about 5cm × 3cm, one surface of each block is polished and then adhered to a glass sheet by using 502 glue, the other surface of each block is polished to be about 100 μm thick, and the blocks are cleaned by clean water to prepare the inclusion sheet.
Next, the type of the uranium mineral and the contemporaneous standard closely symbiotic with the uranium mineral in the collected uranium mineral sample are determined.
Firstly, nondestructive analysis technologies such as a polarizing microscope, a laser Raman spectrometer, an infrared spectrometer and the like are utilized to determine the uranium mineral and the symbiotic type and occurrence form thereof in the fluid inclusion sheet as much as possible, some substances which are difficult to determine are circled by using a pen under the microscope, then the inclusion sheet is sprayed with gold and dried in the shade, and the dried sample in the shade is analyzed for the composition of the substances and the type of the uranium mineral and the contemporary standard substances (such as pyrite, zinc blende, selenium lead ore, organic matters and the like) of the uranium mineral and the compact symbiosis by using a scanning electron microscope and an electron probe.
In this embodiment, it is finally determined that the uranium minerals in the uranium deposit of the dicy-pan hadamard map mainly include uraninite and uraninite minerals (part of the uraninite contains Ti), and the same-period standard type minerals closely symbiotic with the uranium minerals include pyrite, organic matters, sphalerite, molybdenite and the like.
Next, fluid inclusions are delineated that are intergrown with uranium minerals and/or contemporaneous targets.
And carrying out microscopic observation by using a polarizing microscope and a cathode luminescence microscope, determining the type of a main fluid inclusion after a rock formation period in the uranium ore, identifying the fluid inclusion symbiotic with a contemporary standard substance by using the polarizing microscope and a laser Raman spectrometer, and circling and taking a picture by using an ink pen. In this embodiment, the post-diagenesis fluid inclusions in the uranium deposit of the dicrotic pan hadamard map are mainly liquid-rich brine inclusions, gas inclusions, solid carbonaceous inclusions and light oil inclusions, the fluid inclusions symbiotic with uranium minerals/contemporary inclusions are defined based on the period of the contemporary inclusions, and further the brine inclusions, oil inclusions in quartz and brine inclusions in calcite/barite are defined in the symbiotic fluid inclusions as subsequent analysis objects.
Next, the gas, liquid and solid phase components in the enclosed inclusion are measured by using a micro laser raman spectrometer and a micro infrared spectrometer, in this embodiment, the fluid inclusion components in the secondary microcracks of quartz in the uranium deposit of the bigeminy basin hadamard map are mainly: the gas phase component is CH 4 、O 2 、N 2 The liquid phase component is H 2 O, the solid phase component is carbon and pyrite.
Next, measuring the uniform temperature and the freezing point temperature of the fluid inclusion body formed by the enclosed and standard minerals/substances, and firstly, measuring the uniform temperature of the enclosed fluid inclusion body by heating through a microscopic cooling and heating table, wherein the heating rate is generally not more than 10 ℃/min, and when the temperature is close to the uniform temperature, the heating rate is not more than 5 ℃/min; and then, completely freezing the liquid phase of the fluid inclusion by cooling (to below-80 ℃), and then heating to measure the freezing point temperature of the inclusion, wherein the heating speed is generally not more than 5 ℃/min, and when the temperature is close to the freezing point temperature, the heating speed is not more than 2 ℃/min.
Calculating the salinity of the inclusion according to the freezing point temperature by using a freezing point temperature-salinity calculation formula table, and then making a uniform temperature histogram and a uniform temperature-salinity corresponding distribution relation graph.
And then comprehensively identifying the mineral forming fluid according to the obtained type of the contemporary standard substance and information of the composition, uniform temperature, salinity and the like of the symbiotic fluid inclusion.
In the embodiment, the uranium ore of the uranium deposit of the twin-tub bradada map is rich in mobile organic matters, the uranium ore and the mobile organic matters are closely symbiotic, and the contemporaneous standard substances further comprise pyrite, mobile zinc blende, molybdenum formicary and the like.
The fluid inclusion component symbiotic with the synchronous standard substance is rich in carbon and CH 4 The peak value of the uniform temperature is 90 to 110 ℃ and 130 to 150 ℃, the range of the uniform temperature of the symbiotic oil inclusion is 128 to 153 ℃, and the temperature is obviously higher than the maximum burial depth temperature which can be reached in a research area. Salinity is concentrated between 5% and 10% NaCleq, and salinity is relatively high.
In combination with the above evidence, the type of mineralizing fluid effect of hadamard sandstone uranium ores is believed to be an exudation mineralizing fluid effect.
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 spirit of the present invention. The prior art can be adopted in the content which is not described in detail in the invention.
Claims (8)
1. A method of identifying an mineralizing fluid effect type for a sandstone uranium ore, comprising:
collecting a uranium ore sample in sandstone uranium ore;
determining composition, uniform temperature, and salinity of fluid inclusions in the uranium ore sample;
identifying an mineralizing fluid effect type of the sandstone uranium ore, wherein if the composition of a fluid inclusion in the uranium ore sample is determined to comprise hydrocarbon organic matter and/or carbon, the uniform temperature is greater than a first preset value, the salinity is greater than a second preset value, the mineralizing fluid effect type of the sandstone uranium ore is identified as a leaching mineralizing fluid effect, the leaching mineralizing fluid is a reducing fluid containing organic matter and mineralizing matter, which seeps below the sandstone uranium ore, the first preset value is determined based on the maximum burial depth temperature in the sandstone uranium ore mineralizing effect, and the second preset value is determined based on the salinity of an epibiotic fluid;
the determining the composition, uniform temperature, and salinity of fluid inclusions in the uranium ore sample includes:
determining a contemporaneous standard of the sandstone uranium ore in the uranium ore sample, the contemporaneous standard comprising minerals and/or organic matter symbiotic with the sandstone uranium ore;
delineating fluid inclusions intergrown with the sandstone uranium deposit and/or the contemporary standard;
determining the composition, uniform temperature and salinity of fluid inclusions intergrowth with the sandstone uranium ore and/or a contemporaneous standard of the sandstone uranium ore;
the fluid inclusions delineating the intergrowth of the sandstone uranium deposit and/or the contemporary standard comprise:
delineating fluid inclusions intergrowth with the sandstone uranium mine and/or the contemporary standard based on the age and type of fluid inclusions in the fluid inclusion sheet.
2. The method of claim 1, wherein the collecting a uranium ore sample in a sandstone uranium ore comprises:
collecting the sandstone uranium ore with the uranium content of more than 100 multiplied by 10 -6 As the uranium ore sample.
3. The method of claim 1, wherein the delineating fluid inclusions intergrown with the sandstone uranium ore and/or the contemporary standard comprises:
the type of the fluid inclusion was determined using a polarizing microscope and a cathodoluminescence microscope.
4. The method of claim 1, wherein the determining a composition, a uniform temperature, and a salinity of fluid inclusions in the uranium ore sample comprises:
respectively measuring the uniform temperature of the fluid inclusion at different positions;
and determining whether the uniform temperature of the fluid inclusion is greater than the first preset value or not based on the uniform temperature distribution condition of the fluid inclusion.
5. The method of claim 4, wherein the determining a composition, a uniform temperature, and a salinity of fluid inclusions in the uranium ore sample comprises:
respectively measuring the freezing point temperatures of the fluid inclusion at different positions;
determining a salinity of the fluid inclusion based on a freezing temperature of the fluid inclusion;
determining whether the salinity of the fluid inclusions is greater than the second preset value based on the salinity of the fluid inclusions and the corresponding uniform temperature.
6. The method of claim 4, wherein the fluid inclusions at different locations comprise at least:
secondary fluid inclusions distributed in the clastic quartz, the secondary fluid inclusions being the fluid inclusions formed after the clastic quartz, primary fluid inclusions distributed in calcite or barite, the primary fluid inclusions being the fluid inclusions formed contemporaneously with the calcite or barite.
7. The method of claim 1, further comprising:
determining the type of the contemporaneous standard;
and if the synchronous standard object is determined to comprise flowing organic matters, the components of the fluid inclusion in the uranium ore sample comprise hydrocarbon organic matters and/or carbon, the uniform temperature is greater than a first preset value, and the salinity is greater than a second preset value, identifying the type of the effect of the ore-forming fluid of the sandstone uranium ore as the effect of the exudation ore-forming fluid.
8. The method of claim 1, further comprising:
determining the type of the contemporaneous standard;
and if the synchronous standard substance is determined to comprise at least one of pyrite, sphalerite, galena and molybdenite, the components of the fluid inclusion in the uranium ore sample comprise hydrocarbon organic matters and/or carbon, the uniform temperature is greater than a first preset value, and the salinity is greater than a second preset value, identifying the action type of the ore forming fluid of the sandstone uranium ore as the action of the exudation ore forming fluid.
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| CN110596783A (en) * | 2019-09-29 | 2019-12-20 | 核工业北京地质研究院 | Method for counting large-scale oil gas filling time of ore-bearing layer of sandstone-type uranium ore |
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