CN111044708A - Evaluation method suitable for judging uranium source of sandstone-type uranium ore in ancient river valley - Google Patents
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Abstract
The invention belongs to the technical field of evaluation of uranium ore mineralization potential, and particularly discloses an evaluation method suitable for judging a sandstone-type uranium ore uranium source in a basin, which comprises the following steps: collecting a sandstone sample containing a mineral layer; selecting broken zircon in a sample to prepare a zircon target; step (3) testing the U-Pb isotope and the U element content of the zircon; step (4) obtaining a zircon isotope age histogram and a zircon U-Pb isotope age and U content element diagram according to the U-Pb isotope and the U element content; analyzing according to the step (4) to provide source rock-slurry era range and geographical distribution characteristics for the sandstone containing the ore target layer; step (6) finding out the age range of the clastic zircon with the highest U content and particle number according to a graph of the U-Pb isotope age and the U content element of the zircon, and determining a uranium source in a pre-enrichment stage in combination with the step (5); and (7) judging the uranium source in the mineralization stage according to the steps (5) and (6). The method can judge the uranium source in the deposition diagenesis and mineralization action stages of the ore-bearing target layer.
Description
Technical Field
The invention belongs to the technical field of ore formation potential evaluation and ore finding of sandstone-type uranium ores in ancient river valleys, and particularly relates to an evaluation method suitable for judging a uranium source of the sandstone-type uranium ores in basins.
Background
The ancient river valley sandstone type uranium deposit is one of the most important uranium deposit types in the world and is also the main attack direction for uranium deposit exploration in China. A large number of studies show that the U-rich granite around the basin provides a main uranium source and a material source for the ancient valley sandstone type uranium deposit. However, the distribution of granite around the basin is wide, the quantity of granite is large, and the content of U element is different, so that the accurate determination of the uranium source of the ancient river valley sandstone-type uranium deposit becomes a difficult point for the research of the deposit science and the prospecting of the deposit.
The research shows that the uranium source of the gulf sandstone type uranium deposit mainly comprises two parts, namely the uranium source when the diagenetic stage of the ore-containing target layer is subjected to uranium pre-enrichment and the uranium source in the diagenetic stage after the diagenetic stage of the ore-containing target layer is subjected to diagenetic formation, at present, the judgment of the uranium source of the gulf sandstone type uranium deposit is mainly determined by comparing the U element content of the whole rock of the granite which is not different from the whole rock around the basin, but the method has a plurality of defects, mainly comprises the steps of ① that the granite is seriously weathered and corroded to cause a large error in the analysis result of the U element content of the whole rock, ② lacks the accurate determination of the deposit source of the ore-containing target layer, the source of the uranium in the pre-enrichment stage of the diagenetic process of the ore-containing target layer cannot be judged, ③ does not consider the influence of the regional magma-structure activity of the diagenetic stage on the diagenetic effect, and the basis of the delineation the uranium source in the diagenetic stage is not sufficient, so that the delineation the rock of the uranium source is often caused by great uncertainty of the delineation the ore research and the.
Recent research shows that the U element in the granite rock pulp can be preferentially enriched in zircon with a certain distribution coefficient in the rock pulp crystallization process, so that the U content in the zircon can reflect the enrichment degree of the U element in the rock pulp crystallization process. Therefore, the method determines the uranium source in the pre-enrichment stage in the deposition process of the ore-containing target layer by determining the age of the U-Pb isotope of the clastic zircon in the ore-containing target layer and the U element content of the clastic zircon and analyzing the era range and the geographical distribution characteristics of the magma providing a source for the ore-containing target layer; and analyzing the era range and the geographical distribution characteristics of the U-rich magma rock providing the uranium source for the mineralization stage by using a relation diagram of the U-Pb isotope age and the U element content of the clastic zircon containing the mineral target layer and combining with the regional magma-structure activity record after the diagenesis of the mineral target layer, and judging the uranium source in the mineralization stage. The method obviously optimizes the judgment method of the uranium source of the gulf valley sandstone type uranium ore, and obviously improves the reliability of evaluation of the uranium source of the gulf valley sandstone type uranium ore.
Disclosure of Invention
The invention solves the technical problem that the effective evaluation method for the uranium source of the gulf valley sandstone type uranium ore in the prior art is poor in reliability, and further provides a method capable of effectively evaluating the uranium source of the gulf valley sandstone type uranium ore.
The technical scheme for realizing the purpose of the invention is as follows: an evaluation method for judging a uranium source of an ancient river valley sandstone type uranium ore comprises the following steps:
step (1), collecting a sandstone sample of a mineral-containing target layer;
step (2), selecting the clastic zircon in the sandstone sample containing the ore target layer collected in the step (1) and manufacturing the clastic zircon into a zircon target;
step (3), carrying out U-Pb isotope and U element content test on the single-particle clastic zircon manufactured into the target in the step (2);
step (4), processing the U-Pb isotope and U element content test data of the zircon obtained in the step (3) to obtain the age of the U-Pb isotope of the zircon, and constructing a U-Pb isotope age histogram of the zircon and a relationship diagram of the age of the U-Pb isotope of the zircon and the content of the U element;
step (5), according to the age histogram of the zircon U-Pb isotope obtained in the step (4), combining the ages of various magma rocks exposed at the mining area and the periphery of the basin and the range and flow direction characteristics of the ancient river channel, analyzing and providing a source magma epoch range and geographical distribution characteristics for the sandstone containing the ore target layer;
step (6), finding out the age range of the clastic zircon with the highest U content and particle number according to the relation graph of the U-Pb isotope age and the U element content of the clastic zircon obtained in the step (4), and determining a uranium source in a pre-enrichment stage in the deposition process of a mineral-containing target layer by combining the rock age range and the geographical distribution characteristics of the source obtained in the step (5);
and (7) finding out the relationship between the tectonic activity and the mineralization of the diagenetic region containing the target layer of the ore, analyzing the U-rich diagenetic region and the geographical distribution characteristic of the uranium source provided for the mineralization stage according to the diagenetic region and the geographical distribution characteristic of the source obtained in the step (5) and the age range of the clastic zircon obtained in the step (6), and judging the uranium source of the mineralization stage.
In the step (1), a sandstone sample of a mineral-containing target layer is collected in a working area;
and (3) sorting the clastic zircon by using an electromagnetic separation method or a heavy liquid sorting method in the step (2).
And (4) performing analysis test on the U-Pb isotope and the U element of the single-particle zircon by adopting a laser ablation system in the step (3).
And (4) calculating the age of the U-Pb isotope of the zircon and the content of the U element by using ISOPLOT/Ex software, and constructing a U-Pb isotope age histogram of the zircon and a relationship diagram of the age of the U-Pb isotope of the zircon and the content of the U element.
And (5) according to the age histogram of the U-Pb isotope of the clastic zircon, comparing and combining the age of exposed rock mass around the mining area, the range of an ancient river channel and the flow direction characteristic, and determining the age range and the geographical distribution characteristic of the magma rock providing a source for the target layer containing the ore.
And (5) determining the uranium source in the pre-enrichment stage in the deposition process of the ore-containing target layer by utilizing a relation graph of the U-Pb isotope age and the U element content of the clastic zircon and comparing the relation between the U-Pb age and the U content of the zircon according to the analysis result in the step (6).
And (7) determining the uranium source in the mineralization stage by finding out the relationship between the tectonic activity and the mineralization of the area after diagenetic of the objective layer containing the ore and according to the analysis results of the steps (5) and (6).
The invention has the beneficial technical effects that: the evaluation method for judging the uranium source of the gulf valley sandstone type uranium ore is based on the indexes of the content of the zircon U-Pb isotope and the zircon U element in the detritus zircon of the ore-containing target layer in a research area, combines the age of rock bodies around the ore area and the characteristics of the ancient river channel, and investigates the relationship between the magma-structure activity and the mineralization occurring from the sedimentary diagenesis of the ore-containing target layer to the mineralization stage, so that the uranium source in the sedimentary diagenesis and mineralization process of the ore-containing target layer is judged, and the evaluation of the uranium source of the gulf valley sandstone type uranium ore is more reliable and effective.
Drawings
FIG. 1 is a flow chart of a method for judging a uranium source of an ancient valley sandstone-type uranium ore provided by the invention;
FIG. 2 is a representative clastic zircon Cathodoluminescence (CL) image provided by the present invention;
FIG. 3 is a graphical representation of the relationship between age and Th/U ratio for clastic zircon in the Sehan group in the Bilink basin Dehada plot, according to the present invention;
FIG. 4 is a graph showing the consistent age of CZK3 clastic zirconium U-Pb in a Sihan rock sample from the region of the two basins of the present invention;
FIG. 5 is a graph showing the U-Pb concordance of the clastic zircon of the TseHan group sample FZK63-79 in the Bianbei Di Hada Tug region provided by the present invention;
FIG. 6 is a U-Pb age histogram of clastic zircon in the Sehan group in the Bilink basin Dehada plot according to the present invention;
wherein, figure (6a) is the U-Pb age histogram of CZK3 clastic zirconium of Sihan rock sample in the region of Bianpani Di Hada Tug provided by the invention; FIG. 6b is a U-Pb age histogram of FZK63-79 clastic zircon in the Sehan group of Dian-Pan Di-Hada plot according to the present invention;
FIG. 7 is a graph showing the relationship between the age and the U content of U-Pb isotope of clastic zircon in the Hadamard region of Seaham.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The evaluation method for judging the uranium source of the sandstone-type uranium ore in the valley of the ancient river is explained in detail by taking the Hadada region of the two-connected basin as an example.
As shown in fig. 1, the evaluation method for judging the uranium source of the sandstone-type uranium ore in the valley provided by the invention specifically includes the following steps:
step (1), collecting a sandstone sample of a mineral-containing target layer;
in this embodiment, the upper sandstone sample of the ore-bearing target stratum sihan group in the two-pot-connected land hadamard region is collected.
The FZK63-79 sample for the clastic zircon chronology study is taken from a Hada area FZK63-79 drilling 372m and is yellow medium-fine sandstone, and the sample CZK3 is taken from a Hada area CZK328 drilling 281.5m and is yellow medium sandstone. Two samples were taken from the lower part of the upper section of the seohan group and both contained varying degrees of mineralization.
Step (2), selecting the clastic zircon in the sandstone sample containing the ore target layer collected in the step (1) and manufacturing the clastic zircon into a target;
the method comprises the steps of sorting zircon by using methods such as electromagnetic separation, heavy liquid sorting and the like, and selecting fresh zircon crystals with relative self-shape and less impurities under a microscope to manufacture sample targets. After the sample target was ground and polished until most of the center part of the zircon grain was exposed, zircon on which zircon U-Pb isotope analysis was to be performed was selected for photographing by transmitted light, reflected light, and cathodoluminescence (CL image in fig. 2).
Step (3), carrying out content tests of U-Pb isotopes and U elements on the single-particle clastic zircon manufactured into the target in the step (2);
the instrument used for testing the content of U-Pb isotope and U element of the single-particle clastic zircon is a laser ablation system consisting of reduction and ThermoCAPRQ ICP-MS, and the instrument can test the content of the U-Pb isotope and the U element of the single-particle clastic zircon within the range of 33 mu m. In the laser ablation process, helium is used as carrier gas, and argon is used as compensation gas to adjust the sensitivity. The U, Th, Pb contents of zircon were calculated by using a standard silica glass NIST SRM 612 as external standard. The selection of sample and blank signal, the drift correction of instrument sensitivity, element content and U-Th-Pb isotope ratio are completed by software ICPMSDataCal.
Step (4), processing the U-Pb isotope and U element content test data of the zircon obtained in the step (3) to obtain the U-Pb isotope age of the zircon (figure 4; figure 5), and constructing a U-Pb isotope age histogram (figure 6) of the zircon and a U-Pb isotope and U element content graph (figure 7);
in this example, 177 measuring points were analyzed for 177 broken zircon grains in FZK63-79 and CZK3 of the sandstone sample containing the mineral target layer collected in the step (1), and the analysis result and the zircon cathodoluminescence image are shown in fig. 2. From the CL image (fig. 2), most of the zircon mainly has a self-shape-semi-self-shape structure, a long columnar crystal form, and a distinct ring belt structure. Parts of the zircon margin also undergo changes to varying degrees. The zircon microelement composition showed that 168 zircon had a Th/U value greater than 0.4, 8 zircon had a Th/U ratio between 0.1 and 0.4, and 1 zircon had a Th/U ratio less than 0.1 (sample CZK3) (FIG. 3). The characteristics show that most of zircon in the third sandstone of the Sehan group is mainly magma zircon, and the lower Th/U ratio of the other 9 zircon may not be completely related to later-stage transformation effect or metamorphic recrystallization effect.
All data points of the analysis result fall within206Pb/238U-207Pb/235Near the harmonic line on the U-harmonic graph (fig. 4; fig. 5), the degrees of cooperativity are all greater than 90%,206Pb/238the age of U ranges from 122 + -1 Ma to 1975 + -21 Ma, which represents the age of zircon formation.
Determining a magma age range and a geographical distribution characteristic of a source for the sandstone containing the ore target layer according to the clastic zircon U-Pb isotope age histogram (figure 6) obtained in the step (4) by combining the ages of various magmas exposed at the mining area and around the basin and the range and flow direction characteristics of the ancient river channel;
the U-Pb age histogram of the clastic zircon shows (fig. 6 (6a) and (6b)) that the age of the clastic zircon in the top sandstone of the kan group in hada region is mainly midJurasy-early chalky (170 Ma-120 Ma) and early second-third (290 Ma-220 Ma), and then late rocky charcoal, late muddy basin, late second-early muddy basin, middle and late aotao, fringen and middle and ancient. A large number of geological research shows that there are a large number of early chalks, middle-late dwarfism, late carbonism, late mudpan, late shivering-early mudpan, middle-late aotao, the hanwu age and middle-ancient and ancient invasion rocks, volcanic rocks and metamorphic rocks in the development of the bubali-berk elevation and the sunite elevation of the dicy basin. The age distribution of these rocks was similar to that of clastic zircon in the upper part of the Saohan group of the study area, suggesting that the rocks may be potential sources of debris in the upper part of the Saohan group of the Hadamard plot. However, studies have shown that the ancient flow directions of the Qihahguengchu and the Sihangabishi ancient valley in the middle of the two basins are both southwest to northeast. Thus, the upper source of the seohan group in the hadamard region should be provided upstream of the guhegu in the ziharraging diagram, i.e., the sunite mound in its south. Research has shown that the diagenetic age of the magma in the sunitin eminence is dominated by the ancient and the middle generations. Therefore, combining basin geological features, ancient river channel features and the results of the U-Pb age of the clastic zircon, it is clear that the first two-fold-late three-fold and middle Jurassic-early chalky magma on the sunite elevation provides the main source of the first part of the Sichun group in Hada.
Step (6), finding out the age range of the clastic zircon with the highest U element content and the highest particle number according to the relation graph (figure 7) of the clastic zircon U-Pb isotope age and the U element content obtained in the step (4), and simultaneously determining the uranium source in the pre-enrichment stage in the deposition process of the ore-containing target layer by combining the magma age range and the geographical distribution characteristics of the source obtained in the step (5);
as can be seen from FIG. 7, the U content of clastic zircon in different generations in the Sehan group was significantly different. Wherein the content of 145-130 Ma clastic zircon U is 210 multiplied by 10-6～2052×10-6Mean of 697X 10-6(ii) a The U content of 270-255 Ma clastic zircon is 101 multiplied by 10-6～2001×10-6Average of 559X 10-6While the U content of zircon of other ages is relatively low and is mainly distributed at 500X 10-6The average value is about 300X 10-6. Therefore, in the upper source region of the Sehan group, the uranium content of the 145-130 Ma and 270-255 Ma granites is relatively highest, which indicates that the 145-130 Ma and 270-255 Ma granites on the suniting bump are pre-enriched in the deposition process of the ore-bearing target layerThe integration stage provides a large amount of mineralised material.
Step (7), finding out the relation between the tectonic activity and the mineralization of the diagenetic region containing the target layer of the ore, and judging the uranium source in the diagenetic action process according to the diagenetic region and the geographical distribution characteristics of the magma of the source obtained in the step (5) and the age range of the clastic zircon obtained in the step (6);
research shows that the upper deposition age of the Sehan group is the early chalky late period, and the mineral-forming ages of Hada diagram, Sehan Gaobi and Bayangla ore deposits sandstone-type uranium deposits of the twin basin field are ancient times. This indicates that the ore-forming effect of the sandstone-type uranium ores in the upper section of the Sihan group in the two-basin underground area occurs at least 40Ma after the ore body of the ore-containing target layer is deposited into the rocks. Research on diagenesis in the ages shows that late chalkiness and ancient times of magmatic activities are rarely reported from the south of great Khingan to the Guangzhou area of Alexan, and the result shows that the Hada map area is in the calm period of the magmatic activities gradually after early chalkiness. In addition, recent studies have shown that a significant lift-denudation event has occurred between 100Ma and 50Ma in the south segment of great khingan in the dicrotic basin and east. The above evidence indicates that there is little apparent activity of the formation in the zone from the completion of the upper deposition phase of the seohn group to the onset of mineralization. However, the tectonic swelling event that occurs with 100 Ma-50 Ma results in the U-rich granite providing a debris deposit for the upper part of the Sehan group, the target layer containing minerals, may continue to undergo degradation during the late chalks to the ancient times, thereby providing a significant amount of mineral forming material such as uranium for the mineralization. Therefore, by combining the geological characteristics of the region, the source region characteristics and the age of the clastic zircon, 145-130 Ma and 270-255 Ma granites on the Sunit bumps provide a large amount of mineralizing substances for the mineralizing process after the mineralizing of the mineralizing target layer is carried out, and the mineralizing substances are uranium sources in the mineralizing stage.
The present invention has been described in detail with reference to the drawings and examples, and is applicable to uranium deposit mining areas of the sandstone type in ancient valley in our country, and is not limited to the above practical cases, and other supplementary methods can be proposed within the knowledge of those skilled in the art without departing from the spirit of the present invention. The method has important reference significance for judging the uranium source of the sandstone-type uranium deposit in the ancient river valley. The prior art can be adopted in the content which is not described in detail in the invention.
Claims (8)
1. An evaluation method for judging a uranium source of an ancient river valley sandstone type uranium ore is characterized by comprising the following steps of: the method comprises the following steps:
step (1), taking a sandstone sample containing a mineral target layer;
step (2), selecting broken zircon in sandstone containing an ore target layer and making the broken zircon into a zircon target;
step (3), analyzing the contents of U-Pb isotopes and U elements in the single-particle clastic zircon;
step (4), processing the content test data of the U-Pb isotope and the U element of the zircon;
step (5), according to the age analysis result of the zircon U-Pb isotope, the age of various magma rocks exposed around the mining area and the basin, the range of the ancient river channel and the flow direction characteristics are combined, and the age range and the geographical distribution characteristics of the source magma rocks are analyzed and provided for the mineral-containing target layer;
and (6) finding out the age range of the clastic zircon with the highest U content and particle number by comparing the relationship between the U element content of the clastic zircon and the age of the U-Pb isotope, and determining the uranium source in the pre-enrichment stage in the deposition process of the ore-containing target layer by combining the analysis result of the step (5).
And (7) finding out the relationship between the tectonic activity and the mineralization of the diagenetic region containing the target layer containing the ore by combining the existing geological data, analyzing the epoch range and the geographical distribution characteristics of the U-rich magma providing uranium sources for the mineralization stage according to the analysis results of the steps (5) and (6), and judging the uranium sources of the mineralization stage.
2. The evaluation method for judging the uranium source of the sandstone-type uranium ore in the ancient river valley according to claim 1, wherein the evaluation method comprises the following steps: and (2) in the step (1), a sandstone sample of a mineral-containing target layer is collected in a working area.
3. The evaluation method for judging the uranium source of the sandstone-type uranium ore in the ancient river valley according to claim 1, wherein the evaluation method comprises the following steps: and (3) sorting the broken zircon by using methods such as electromagnetic separation, heavy liquid sorting and the like in the step (2), wherein the sorted zircon requires that the crystal form of a girdle is intact, and then the zircon target is manufactured.
4. The evaluation method for judging the uranium source of the sandstone-type uranium ore in the ancient river valley according to claim 1, wherein the evaluation method comprises the following steps: and (4) carrying out analysis test on the U-Pb isotope and the U element of the single-particle zircon in the step (3).
5. The evaluation method for judging the uranium source of the sandstone-type uranium ore in the ancient river valley according to claim 1, wherein the evaluation method comprises the following steps: and (4) calculating the age of the U-Pb isotope of the zircon and the content of the U element by using ISOPLOT/Ex, and making an age histogram according to the test result according to the age interval.
6. The evaluation method for judging the uranium source of the sandstone-type uranium ore in the ancient river valley according to claim 1, wherein the evaluation method comprises the following steps: and (5) according to the analysis result of the U-Pb isotope age of the clastic zircon, comparing and combining the age of exposed rock mass around the mining area, the range of an ancient river channel and the flow direction characteristic, and determining the time range and the geographical distribution characteristic of the magma rock providing a source for the target layer containing the ore.
7. The evaluation method for judging the uranium source of the sandstone-type uranium ore in the ancient river valley according to claim 1, wherein the evaluation method comprises the following steps: and (5) determining the uranium source in the pre-enrichment stage in the deposition process of the ore-containing target layer by using the U content and U-Pb age data of the clastic zircon and comparing the relationship between the U-Pb age and the U content of the zircon according to the analysis result of the step (6).
8. The evaluation method for judging the uranium source of the sandstone-type uranium ore in the ancient river valley according to claim 1, wherein the evaluation method comprises the following steps: and (7) determining the uranium source in the mineralization stage by finding out the relationship between the tectonic activity and the mineralization of the area after diagenetic of the objective layer containing the ore and according to the analysis results of the steps (5) and (6).
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| CN111694069A (en) * | 2020-06-09 | 2020-09-22 | 核工业北京地质研究院 | Rapid selection method for early exploration of sandstone-type uranium ores |
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| CN114354734A (en) * | 2021-12-28 | 2022-04-15 | 核工业北京地质研究院 | Method for distinguishing sandstone-type uranium deposit orelayer deposition structure environment |
| CN114910976A (en) * | 2022-04-18 | 2022-08-16 | 中国科学院西北生态环境资源研究院 | Geological evaluation method for helium resource potential in low-exploration-degree area |
| CN114910976B (en) * | 2022-04-18 | 2023-08-15 | 中国科学院西北生态环境资源研究院 | Geological evaluation method for helium resource potential in low exploration degree area |
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