CN110715925A - Method for tracing thermal fluid activity of basin sandstone type uranium deposit - Google Patents
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Abstract
The invention belongs to the technical field of uranium ores, and particularly relates to a method for tracing hot fluid activity of a sandstone-type uranium ore area, which comprises the following steps: the method comprises the following steps: collecting research data, and determining whether volcanic rock develops inside and around the basin sandstone type uranium ore; step two: collecting sandstone samples of ore-containing target layers in a sandstone-type uranium mining area, wherein the sandstone samples comprise ore-rich samples and ore-free samples; step three: manufacturing a mineral-rich sample optical thin sheet and a fluid inclusion sheet; preparing a non-mineral sample, and selecting heavy mineral apatite; step four: carrying out rock ore identification work on the optical slice, and finding out hydrothermally altered minerals and combination types thereof as well as hydrothermally altered minerals related to uranium minerals; step five: finishing the temperature measurement work of the heat flow inclusion, and comprehensively analyzing uniform temperature data; step six: performing inversion on the heat evolution history of ore-bearing layers in the sandstone-type uranium deposit area through apatite fission tracks in the third step; step seven: and comprehensively analyzing the steps from the first step to the sixth step, and judging whether the basin sandstone uranium ore is subjected to the hot fluid activity modification.
Description
Technical Field
The invention belongs to the technical field of uranium ores, and particularly relates to a method for tracing hot fluid activities of sandstone-type uranium ore regions.
Background
Since the introduction of the typical interlaminar oxidation zone ore-forming theory of the United states and the ore-forming theory of the uranium deposit by the former Susan Union water in the 80 th of 20 th century, a large batch of large, medium and extra large sandstone-type uranium deposit is discovered in a plurality of basins such as Ili basin, Ordos basin, Tuhaan basin, Bilian basin, Songliao basin, Tarim basin, Barin Gobi and the like in sequence, so that the sequence of the discovered sandstone-type uranium deposit and the predicted resource amount in China is changed from the third to the first in the four large uranium deposit types. Meanwhile, in the process of exploration and research of sandstone-type uranium ores, a large number of researches of uranium ore geologists find that compared with typical interlayer oxidation zone sandstone-type uranium ores, domestic middle-east rock-type uranium ores (Ordos basin, Dip basin, Bartonella basin and Disongliao basin), the sandstone-type uranium ores have obvious differences in the aspects of oxidation zones, element geochemical zones, altered mineral combination characteristics, uranium mineral types and the like of uranium ore deposits and show the characteristics of hot fluid transformation, but the sandstone-containing layers of sandstone-type uranium ores have no systematic research on the geological response of hot fluid activities, and the tracing technology for judging whether the ore-containing layers have hot fluid activities is also lacked.
Therefore, a systematic technical method is needed to find out whether the sandstone-type uranium ore in the basin undergoes the hot fluid transformation process, which is the basis and premise for researching the superposition transformation effect of hot fluid activity and uranium mineralization in the deep part of the basin, is especially important for evaluating the superposition transformation effect of hot fluid activity and uranium mineralization in the sandstone-type uranium ore region, and can also provide a new thought and a new method for researching the mechanism and the theory of mineralization of the sandstone-type uranium ore.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for tracing the hot fluid activity of the basin sandstone-type uranium ore, which is used for judging whether the basin sandstone-type uranium ore is transformed by the hot fluid or not so as to evaluate the relationship between the basin hot fluid activity and uranium mineralization.
The technical scheme of the invention is as follows:
a method for tracing thermal fluid activity of a basin sandstone-type uranium deposit specifically comprises the following steps:
the method comprises the following steps: collecting research data, and determining whether volcanic rock develops inside and around the basin sandstone type uranium ore;
step two: collecting sandstone samples of ore-containing target layers in a sandstone-type uranium mining area, wherein the sandstone samples comprise ore-rich samples and ore-free samples;
step three: manufacturing a mineral-rich sample optical thin sheet and a fluid inclusion sheet; preparing a non-mineral sample, and selecting heavy mineral apatite;
step four: carrying out rock ore identification work on the optical slice, and finding out hydrothermally altered minerals and combination types thereof as well as hydrothermally altered minerals related to uranium minerals;
step five: on the basis of the fine observation and research of the heat flow inclusion, the temperature measurement work of the heat flow inclusion is completed, and the comprehensive analysis is carried out on the uniform temperature data;
step six: performing inversion on the heat evolution history of ore-bearing layers in the sandstone-type uranium deposit area through apatite fission tracks in the third step;
step seven: and comprehensively analyzing the steps from the first step to the sixth step, and judging whether the basin sandstone uranium ore is subjected to the hot fluid activity modification.
Thirdly, manufacturing a light slice and a fluid inclusion sheet of the rich-mineral sample; making a mineral-free sample, and selecting apatite, further comprising: cementing the rich ore sample with fir glue, and grinding a polished slice and a wrapping sheet; the mineral-free sample is subjected to coarse crushing, fine crushing, screening, elutriation, magnetic separation and heavy liquid separation, and then hundreds to thousands of apatite are selected under binoculars.
The rock and ore identification work of the optical thin slice in the fourth step comprises the following steps: and (3) performing fine observation on the light slice by using rock and ore identification means such as a polarizing microscope, a scanning electron microscope, an electronic probe and the like.
The fluid inclusion detailed study in the step five comprises the following steps: the homogeneous temperature measurement is completed by selecting a secondary inclusion group in secondary increase of carbonate cement and quartz through fluid inclusion lithology research, the homogeneous temperature statistical peak temperature is determined through data statistical analysis of the homogeneous temperature, and whether the ore-containing target layer of the sandstone-type uranium ore undergoes the transformation of hot fluid or not is determined by comparing the homogeneous temperature statistical peak temperature with the maximum paleo-earth temperature which can be reached by normal burial of the ore-containing target layer of the sandstone-type uranium ore.
In the sixth step, the inversion of the thermal evolution history of the ore-bearing layer of the sandstone-type uranium deposit area through the apatite fission track in the third step further comprises the following steps: by applying a low-temperature thermal chronology theory and method and combining structural evolution analysis of a sandstone-type uranium ore region, firstly, carrying out target making, polishing, etching, radiation and mica etching on selected apatite, and then, applying corresponding software to complete the spontaneous apatite, induced track statistics and measurement of the length of Dpar under reflected light, wherein the length of Dpar is the maximum diameter of a fission track corrosion image which is parallel to a crystal C axis and is intersected with a polished surface.
And introducing data such as spontaneous apatite, induced track statistics, measured value of the length of the Dpar under reflected light and the like obtained in the sixth step into HeFTy software, jointly inverting a thermal evolution history experienced after the formation of the ore-containing layer of the uranium ore region through the HeFTy software, and judging whether the ore-containing target layer of the sandstone-type uranium ore undergoes the transformation of a thermal event or not.
And in the second step, the ore-rich sample is massive coarse sandstone, the size of the ore-rich sample is 3cm multiplied by 6cm multiplied by 9cm, the ore-free sample is coarse sandstone-gravel-containing coarse sandstone, and the weight of the ore-free sample is 5Kg-10 Kg.
The invention has the beneficial effects that: the method for tracing the thermal fluid activity of the sandstone-type uranium deposit in the basin provided by the invention covers the processes from field geological observation sampling to indoor data collection and experimental analysis, and has clear analysis and test requirements and strong operability. In addition, the method provides a basis for judging whether the sandstone-type uranium ore in the basin undergoes the hot fluid activity transformation based on direct and indirect evidences of the hot fluid activity, is a basis and premise for researching the superposition transformation effect of the hot fluid activity and uranium ore formation in the deep part of the basin, and can provide a new thought and a new method for researching the mechanism and the theory of ore formation of the sandstone-type uranium ore.
Drawings
FIG. 1 is a flow chart of a method for tracing thermal fluid activity of a basin sandstone-type uranium deposit according to the present invention;
FIG. 2 is a comprehensive analysis diagram of uniform temperature of fluid inclusions in sandstone of ore-bearing layers of sandstone-type uranium ore at the north edge of Ore basin in Ore Doss basin in the embodiment of the invention;
fig. 3 is an inversion diagram of apatite fission traces of ore-bearing layer diagrams of the anderson basin north border sandstone-type uranium ore in the embodiment of the invention.
Detailed Description
The method for tracing the thermal fluid activity of the basin sandstone-type uranium deposit designed by the invention is described in detail below with reference to the accompanying drawings and examples.
A method for tracing thermal fluid activity of a basin sandstone-type uranium deposit specifically comprises the following steps:
the method comprises the following steps: collecting research data, and determining whether volcanic rock develops inside and around the basin sandstone type uranium ore;
step two: collecting sandstone samples of ore-containing target layers in a sandstone-type uranium mining area, wherein the sandstone samples comprise ore-rich samples and ore-free samples;
step three: manufacturing a mineral-rich sample optical thin sheet and a fluid inclusion sheet; preparing a non-mineral sample, and selecting heavy mineral apatite;
step four: carrying out rock ore identification work on the optical slice, and finding out hydrothermally altered minerals and combination types thereof as well as hydrothermally altered minerals related to uranium minerals;
step five: on the basis of the fine observation and research of the heat flow inclusion, the temperature measurement work of the heat flow inclusion is completed, and the comprehensive analysis is carried out on the uniform temperature data;
step six: performing inversion on the heat evolution history of ore-bearing layers in the sandstone-type uranium deposit area through apatite fission tracks in the third step;
step seven: and comprehensively analyzing the steps from the first step to the sixth step, and judging whether the basin sandstone uranium ore is subjected to the hot fluid activity modification.
Thirdly, manufacturing a light slice and a fluid inclusion sheet of the rich-mineral sample; making a mineral-free sample, and selecting apatite, further comprising: cementing the rich ore sample with fir glue, and grinding a polished slice and a wrapping sheet; the mineral-free sample is subjected to coarse crushing, fine crushing, screening, elutriation, magnetic separation and heavy liquid separation, and then hundreds to thousands of apatite are selected under binoculars.
The rock and ore identification work of the optical thin slice in the fourth step comprises the following steps: and (3) performing fine observation on the light slice by using rock and ore identification means such as a polarizing microscope, a scanning electron microscope, an electronic probe and the like.
The fluid inclusion detailed study in the step five comprises the following steps: the homogeneous temperature measurement is completed by selecting a secondary inclusion group in secondary increase of carbonate cement and quartz through fluid inclusion lithology research, the homogeneous temperature statistical peak temperature is determined through data statistical analysis of the homogeneous temperature, and whether the ore-containing target layer of the sandstone-type uranium ore undergoes the transformation of hot fluid or not is determined by comparing the homogeneous temperature statistical peak temperature with the maximum paleo-earth temperature which can be reached by normal burial of the ore-containing target layer of the sandstone-type uranium ore.
In the sixth step, the inversion of the thermal evolution history of the ore-bearing layer of the sandstone-type uranium deposit area through the apatite fission track in the third step further comprises the following steps: by applying a low-temperature thermal chronology theory and method and combining structural evolution analysis of a sandstone-type uranium ore region, firstly, carrying out target making, polishing, etching, radiation and mica etching on selected apatite, and then, applying corresponding software to complete the spontaneous apatite, induced track statistics and measurement of the length of Dpar under reflected light, wherein the length of Dpar is the maximum diameter of a fission track corrosion image which is parallel to a crystal C axis and is intersected with a polished surface.
And introducing data such as spontaneous apatite, induced track statistics, measured value of the length of the Dpar under reflected light and the like obtained in the sixth step into HeFTy software, jointly inverting a thermal evolution history experienced after the formation of the ore-containing layer of the uranium ore region through the HeFTy software, and judging whether the ore-containing target layer of the sandstone-type uranium ore undergoes the transformation of a thermal event or not.
And in the second step, the ore-rich sample is massive coarse sandstone, the size of the ore-rich sample is 3cm multiplied by 6cm multiplied by 9cm, the ore-free sample is coarse sandstone-gravel-containing coarse sandstone, and the weight of the ore-free sample is 5Kg-10 Kg.
As shown in fig. 1, the following further explains a method for tracing thermal fluid activity of sandstone-type uranium ore in basin according to the present invention, taking an sandstone-type uranium ore area in north edge of the deldos basin as an example, and the method includes three stages of indoor data collection, field geological observation and sampling, indoor experiment and data analysis, and specifically includes the following steps:
the method comprises the following steps: previous research data was collected, and igneous rocks in the deldos basin did not develop, but developed more in the Yanshan period around the basin, such as northern Hangqi black stone headchannel basalt (126Ma), and the presence of igneous rocks is direct evidence that the basin experiences the effects of thermal events and hot fluids.
Step two: collecting ore bed sandstone samples of Ore bed in Ore region of northern marginal sandstone of Ore basin
For example, a rich ore sample and a non-ore sample of a straight ore group in an ore-bearing stratum in a sandstone-type uranium mine area at the north edge of an Ordos basin are collected, wherein the rich ore sample is massive sandstone, the size of the rich ore sample is 3cm multiplied by 6cm multiplied by 9cm, the non-ore sample is sandstone-gravel-containing sandstone, and the weight of the non-ore sample is 5Kg-10 Kg;
step three: preparing the rich mineral sample into light slice, wrapping sheet and mineral-free sample to select out the heavy mineral apatite
For example, a rich sample is first glued with fir glue and then ground into smooth flakes and wrapped pieces; the ore-free sample is firstly subjected to coarse crushing, fine crushing, screening, elutriation, magnetic separation and heavy liquid separation, and then hundreds to thousands of apatite are selected under binoculars.
Step four: performing rock ore identification work on the photopilm, and finding out hydrothermally altered minerals and combination types thereof and hydrothermally altered minerals related to uranium minerals
The method mainly comprises the following steps of carrying out fine observation on the optical slice by using rock and ore identification means such as a polarizing microscope, a scanning electron microscope and an electronic probe, and finding out the combination type of the Oreochromite-modified minerals in the North edge of Ore: pyrite-galena-uranite, and altered titanium uranite-anatase-uranite.
Step five: on the basis of the fine observation and research of the inclusion, the temperature measurement of the inclusion is completed, and the uniform temperature data is comprehensively analyzed to obtain the uniform temperature peak value
For example, through careful research on fluid inclusion lithology, a secondary inclusion group with carbonate cement and quartz growing and cutting through quartz cracks is selected to complete measurement of uniform temperature of 323 inclusions in 42 samples, wherein the uniform temperature is between 65 ℃ and 133 ℃, and the peak value is between 80 ℃ and 90 ℃ and between 100 ℃ and 120 ℃, as shown in fig. 2. The previous research considers that the normal temperature which can be reached by normal burial of the Ordosi basin troro group is about 70 ℃, the temperature of the ancient fluid is far higher than 70 ℃, and a basis is provided for the Ornitholite type uranium ore in the north edge of the Ordosi basin to undergo thermal fluid transformation.
Step six: performing inversion on the thermal evolution history of the ore-bearing target layer in the sandstone-type uranium mining area through the apatite fission track;
for example, firstly, the selected apatite is subjected to targeting, polishing, etching, radiation and mica etching operations, then corresponding software is applied to complete spontaneous apatite, induced track statistics and Dpar length measurement under reflected light, the obtained data is guided into HeFTy software, and the history of ore-containing layer shape thermal evolution of the northern sandstone-type uranium ore area of the Ordos basin is completed, as shown in FIG. 3, the result shows that the ore-containing layer is subjected to the action of thermal events;
step S7: comprehensively analyzing the steps S1, S3, S4, S5 and S6 to judge whether the basin sandstone uranium ore is transformed by the hot fluid activity
And (3) judging that the ore-containing layer of the Ore basin undergoes the transformation effect of low-temperature hot fluid by combining direct evidence (the black stone gutter basalt developed by the Hangjingqi chalk system) and indirect evidence (the pyrite-galena-uranite and altered titanium uranite-anatase-uranite combined low-temperature hydrothermal alteration, the ancient fluid temperature of which is far higher than 70 ℃ and the ore-containing layer undergoes a thermal event), wherein the hot fluid activity has a later-stage superposition transformation effect on the uranium ore-forming.
Claims (7)
1. A method for tracing hot fluid activities of basin sandstone type uranium ores is characterized by comprising the following steps: the method specifically comprises the following steps:
the method comprises the following steps: collecting research data, and determining whether volcanic rock develops inside and around the basin sandstone type uranium ore;
step two: collecting sandstone samples of ore-containing target layers in a sandstone-type uranium mining area, wherein the sandstone samples comprise ore-rich samples and ore-free samples;
step three: manufacturing a mineral-rich sample optical thin sheet and a fluid inclusion sheet; preparing a non-mineral sample, and selecting heavy mineral apatite;
step four: carrying out rock ore identification work on the optical slice, and finding out hydrothermally altered minerals and combination types thereof as well as hydrothermally altered minerals related to uranium minerals;
step five: on the basis of the fine observation and research of the heat flow inclusion, the temperature measurement work of the heat flow inclusion is completed, and the comprehensive analysis is carried out on the uniform temperature data;
step six: performing inversion on the heat evolution history of ore-bearing layers in the sandstone-type uranium deposit area through apatite fission tracks in the third step;
step seven: and comprehensively analyzing the steps from the first step to the sixth step, and judging whether the basin sandstone uranium ore is subjected to the hot fluid activity modification.
2. The method for tracing thermal fluid activity of a basin sandstone-type uranium deposit according to claim 1, wherein the third step is to make an ore-rich sample optical sheet and a fluid inclusion sheet; making a mineral-free sample, and selecting apatite, further comprising: cementing the rich ore sample with fir glue, and grinding a polished slice and a wrapping sheet; the mineral-free sample is subjected to coarse crushing, fine crushing, screening, elutriation, magnetic separation and heavy liquid separation, and then hundreds to thousands of apatite are selected under binoculars.
3. The method for tracing thermal fluid activity of a pelvic sandstone-type uranium deposit according to claim 2, wherein the step four mid-light slice rock identification includes: and (3) performing fine observation on the light slice by using rock and ore identification means such as a polarizing microscope, a scanning electron microscope, an electronic probe and the like.
4. The method of tracking thermal fluid activity of a uranium deposit of the penaeid sandstone type according to claim 3, wherein the fluid inclusion refinement study in step five comprises: the homogeneous temperature measurement is completed by selecting a secondary inclusion group in secondary increase of carbonate cement and quartz through fluid inclusion lithology research, the homogeneous temperature statistical peak temperature is determined through data statistical analysis of the homogeneous temperature, and whether the ore-containing target layer of the sandstone-type uranium ore undergoes the transformation of hot fluid or not is determined by comparing the homogeneous temperature statistical peak temperature with the maximum paleo-earth temperature which can be reached by normal burial of the ore-containing target layer of the sandstone-type uranium ore.
5. The method of tracing the thermal fluid activity of a basin sandstone-type uranium deposit according to claim 4, wherein the sixth step of inverting the history of the thermal evolution of the mineral bearing layer of the sandstone-type uranium deposit by apatite fission tracks in the third step further comprises: by applying a low-temperature thermal chronology theory and method and combining structural evolution analysis of a sandstone-type uranium ore region, firstly, carrying out target making, polishing, etching, radiation and mica etching on selected apatite, and then, applying corresponding software to complete the spontaneous apatite, induced track statistics and measurement of the length of Dpar under reflected light, wherein the length of Dpar is the maximum diameter of a fission track corrosion image which is parallel to a crystal C axis and is intersected with a polished surface.
6. The method for tracing thermal fluid activity of the sandstone-type uranium ore in the basin according to claim 5, wherein the data of spontaneous apatite, induced track statistics, measured value of Dpar length under reflected light and the like obtained in the sixth step are introduced into HeFTy software, and thermal evolution history experienced after the formation of the ore-bearing layer in the uranium ore region is jointly inverted through the HeFTy software, so that whether the ore-bearing target layer of the sandstone-type uranium ore undergoes the modification of the thermal event is judged.
7. The method for tracing thermal fluid activity of a uranium ore of the basin sandstone type according to claim 1, wherein in the second step, the ore-rich sample is massive sandstone, the size of the ore-rich sample is 3cm x 6cm x 9cm, the ore-free sample is sandstone-gravelly-containing sandstone, and the weight of the ore-free sample is 5Kg to 10 Kg.
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| CN114034838A (en) * | 2020-10-21 | 2022-02-11 | 核工业北京地质研究院 | Oil-gas dissipation and sandstone-type uranium ore body space positioning method in multi-energy basin |
| CN114034838B (en) * | 2020-10-21 | 2023-07-14 | 核工业北京地质研究院 | Method for locating oil gas dissipation and sandstone type uranium ore body space in multi-energy basin |
| CN113189668B (en) * | 2021-04-29 | 2022-05-06 | 东华理工大学 | Ore searching method for sandstone-type uranium ore in basin |
| CN113189668A (en) * | 2021-04-29 | 2021-07-30 | 东华理工大学 | Ore searching method for sandstone-type uranium ore in basin |
| CN114397422A (en) * | 2021-12-14 | 2022-04-26 | 核工业北京地质研究院 | Method for calculating element mobility in process of forming sandstone-type uranium deposit clay minerals |
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