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CN-121978306-A - Identification method of sandstone primary color and secondary color in basin red variegated uranium-containing construction

CN121978306ACN 121978306 ACN121978306 ACN 121978306ACN-121978306-A

Abstract

The invention belongs to the field of sandstone-type uranium ores capable of being immersed in the ground, and particularly relates to a method for identifying primary color and secondary color of sandstone in basin red variegated uranium-containing construction, which comprises the following steps of analyzing macroscopic and microscopic geological features of sandstone with different colors; the method comprises the following steps of analyzing the spatial distribution rules of sandstone with different colors, analyzing the geochemical characteristics of the sandstone with different colors, quantitatively reconstructing and analyzing ancient climates and ancient environments, analyzing the deposition phase color control rules, and identifying the original color and the secondary color of the sandstone by multi-dimensional comprehensive collaborative analysis. The method can effectively and accurately identify the primary color and secondary color of sandstone in red variegated construction, accurately divide geochemistry zonation and draw the front line position of an oxidation zone in red variegated construction, improve the ore finding effect and probability of uranium ores, and prevent the omission of sandstone-type uranium ores possibly existing in ancient depressions or fracture development positions in the center of a basin.

Inventors

  • DING BO
  • HE FENG
  • LIU HONGXU
  • ZHANG ZILONG

Assignees

  • 核工业北京地质研究院

Dates

Publication Date
20260505
Application Date
20260119

Claims (10)

  1. 1. A method for identifying a primary color and a secondary color of sandstone in a basin red variegated uranium-containing construction, comprising: Analyzing macroscopic and microscopic geological features of sandstone with different colors; step two, analyzing the spatial distribution rules of sandstone with different colors; step three, analyzing geochemical characteristics of sandstone with different colors; Step four, quantitative reconstruction analysis of ancient climate-ancient environment; Fifthly, analyzing a deposition phase control color rule; and step six, multi-dimensional comprehensive collaborative analysis is performed to identify the original color and the secondary color of sandstone.
  2. 2. The method for identifying the primary color and the secondary color of sandstone in the uranium-bearing basin red construction according to claim 1, wherein the first step comprises finding out macroscopic and microscopic features of sandstone with different colors through fine observation of drill cores and petrographic analysis of typical samples to cooperatively identify the primary color and the secondary color of sandstone.
  3. 3. The method for identifying primary and secondary colors of sandstone in uranium-bearing basin red construction according to claim 2, wherein the primary and secondary color discrimination indicators in the first step include whether the sandstone color is related to granularity and cementation degree, and the sandstone color uniformity and color change boundary definition, the occurrence state of a coloring agent, the distribution characteristics of a reducing substance, and a special structure.
  4. 4. The method for identifying primary colors and secondary colors of sandstone in basin red and variegated uranium-containing construction according to claim 2, wherein the second step comprises the steps of drawing spatial spreading characteristics of sections and planes of sandstone with different colors on the basis of fine observation of drill cores in the first step, finding out the spreading rules of sandstone with different colors on the sections and planes, and determining whether the spreading rules are related to development positions such as sedimentary facies spreading, palace, fracture and the like.
  5. 5. The method for identifying primary and secondary colors of sandstone in a basin red and variegated uranium containing construction according to claim 4, wherein the third step comprises performing X-ray diffraction and main trace element tests by taking sandstone samples of different colors in a borehole, and analyzing characteristics of the types and contents of sandstone fragments of different colors and characteristics of the types and contents of the colorants.
  6. 6. The method for identifying the primary color and the secondary color of sandstone in the uranium-bearing basin red construction according to claim 5, wherein the sandstone chips in the third step comprise quartz and potash feldspar, the colorant comprises hematite, goethite, manganese oxide, chlorite and organic matters, the quartz chips are multi-gray, the potash feldspar chips are multi-colored red, the hematite is multi-colored red-brown, the goethite is multi-colored yellow, the manganese oxide is multi-colored purple-gray black, the chlorite is multi-colored green and the organic matters are multi-colored black.
  7. 7. The method for identifying the primary color and the secondary color of sandstone in the uranium-bearing basin red construction according to claim 5, wherein the fourth step includes the steps of performing a main trace element test on the collected fine sediment sample and comprehensively analyzing the characteristics of the archaic climate and the archaic environment of the red construction.
  8. 8. The method for identifying primary and secondary colors of sandstone in a basin red and variegated uranium-containing construction according to claim 7, wherein the primary trace element discrimination indicators in the fourth step include Sr/Ba, V/Cr, ni/Co, V/(V+Ni) and Sr/Cu ratios.
  9. 9. The method for identifying the primary and secondary colors of sandstone in a basin red and variegated uranium-containing construction according to claim 7, wherein the fifth step comprises analyzing the composition structure, granularity, roundness and maturity of sediments in the red and variegated construction according to the basis of field drilling core observation and rock-ore identification in the first step, combining the combination relation change and gyratory development characteristics of the sediments in the vertical direction, preliminarily finding out the development characteristics of the sediments in the red and variegated construction, determining the development characteristics on a sedimentary phase plane by drawing characteristic graphs such as a sand isopach graph, a sand/mud ratio graph and the like, and judging the primary colors of the sediments according to different sedimentary corresponding transportation dynamic characteristics, sand sedimentation environments and vegetation conditions.
  10. 10. The method for identifying the primary color and the secondary color of the sandstone in the red-doped uranium-bearing construction of the basin according to claim 9 is characterized by comprising the steps of comprehensively identifying the primary color and the secondary color of the sandstone in the red-doped uranium-bearing construction according to the macroscopic and microscopic characteristics of the sandstone in the red-doped uranium-bearing construction, the spatial distribution rule of sandstone with different colors, the geochemical characteristics of sandstone with different colors, the ancient climate-ancient environment characteristics, the sedimentary facies characteristics and other multidimensional discrimination, wherein if the primary color of the sandstone in the red-doped uranium-bearing construction is red, the subsequent mineral exploration needs to pay attention to the fracture development part, and if the primary color of the sandstone in the red-doped uranium-bearing construction is gray green, the subsequent mineral exploration needs to pay attention to the basin edge position and the ancient depression part in the center of the basin, finding the position of the gray green sand formed by controlling uranium mineralization, and combining with the accurate drawing of a frontal line before an oxidation zone to finish the uranium ore exploration.

Description

Identification method of sandstone primary color and secondary color in basin red variegated uranium-containing construction Technical Field The invention belongs to the field of sandstone-type uranium ores capable of being immersed, and particularly relates to a method for identifying primary color and secondary color of sandstone in basin red variegated uranium-containing construction. Background In the 90 s of the 20 th century, a large batch of large, medium and very large sandstone-type uranium deposits were found in a plurality of basins such as Yili, erdos, tuha, songliao and Bayibi, and six large sandstone-type uranium bases were established. In recent years, along with the transition of the prospecting thought, important progress is made in uranium ore prospecting in red mottled construction formed in semiarid-arid climate background, such as thick and rich uranium ore bodies in northern and southwest chalky red mottled construction of a Erdos basin, the uranium ore bodies in red mottled construction of the West limbus of a Qidamu basin, industrial mineralization clues in red mottled construction of a Shawan group of the vehicle row of the Sungrouge basin, and the like, and the potential of sandstone-type uranium ore resources in red mottled construction is shown to be huge. The existing investigation results show that uranium is integrally produced near the interface of oxidized sandstone and reduced sandstone in the red variegated construction, and is controlled by an oxidation front, and a secondary oxidation zone identification and geochemistry zonal division mark in the red variegated construction are indicated to be extremely critical to uranium ore investigation deployment, wherein sandstone color cause identification is a key core. However, sandstones with different colors such as red, yellow, green, gray and the like are commonly seen in red variegated construction, and can be caused by the oxidative modification of the original gray-green sandstone or the later-stage reductive fluid modification of the original red sandstone. The two conditions have different ore forming modes, ore finding directions and ore finding positions, which clearly increases the difficulty and uncertainty of uranium ore finding in red variegated construction. Therefore, the accurate identification of the primary color and the secondary color of sandstone in red variegated construction is particularly important to divide geochemistry zonal and accurately determine the front position of an oxidation zone and the subsequent direction of prospecting. At present, the research on sandstone color causes in red and variegated construction mainly has the technical limitations that ① single-index discrimination methods mainly depend on single geochemical indexes or macroscopic geologic features to judge, lack systematicness, for example, redox environment is judged only through Fe 3+/Fe2+ ratio, control action of sedimentary phase and paleoclimate is ignored, ② microcosmic-macroscopic disjoint, microcosmic lithology observation and macroscopic spreading feature lack organic combination to cause contradiction of judging results, ③ paleoclimate-paleoclimate reconstruction is insufficient, effective indexes are not needed for controlling paleoclimate formed by colors and paleohydrological condition reconstruction, especially discrimination of a temperature-humidity-drought transition climate zone are lacked, ④ practicability is insufficient, the existing methods stay in a theoretical research stage, and standardized flow capable of guiding exploration practice cannot be formed. Therefore, with the geological problem to be solved in the sandstone uranium deposit exploration process as an entry point, development of a sandstone primary color and secondary color identification method with strong comprehensiveness, high accuracy and good operability is urgently needed to overcome the defects of the prior art. Disclosure of Invention The invention aims to provide a method for identifying primary and secondary colors of sandstone in red and variegated uranium-containing construction of a basin, which integrates the comprehensive identification methods of multidimensional discrimination indexes such as macroscopic and microscopic characteristics, space distribution rules, geochemical characteristics, ancient climate-ancient environment characteristics, sedimentary facies characteristics and the like, can effectively and accurately identify the primary and secondary colors of sandstone in red and variegated construction, correctly divide the geochemical zoning and the front-front line position of an oxidation zone in red and variegated construction, improve the ore finding effect and probability of uranium ores, and prevent the omission of sandstone-type uranium ores possibly existing in ancient depressions or fracture development positions in the center of the basin. The technical scheme for realizing the purpose of the invention co