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2021 Vol. 48, No. 4
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HUANG Guangnan, HUANG Guangwen, WANG Weichao, CHEN Zhengle, YAN Xiang, YU Reng'an, ZHANG Chengyong. 2021. Geology and minerogenetic condition of the Lenghu sandstone-type uranium deposit in the northern margin of Qaidam Basin[J]. Geology in China, 48(4): 1200-1211. doi: 10.12029/gc20210416
Citation: HUANG Guangnan, HUANG Guangwen, WANG Weichao, CHEN Zhengle, YAN Xiang, YU Reng'an, ZHANG Chengyong. 2021. Geology and minerogenetic condition of the Lenghu sandstone-type uranium deposit in the northern margin of Qaidam Basin[J]. Geology in China, 48(4): 1200-1211. doi: 10.12029/gc20210416
shu

Geology and minerogenetic condition of the Lenghu sandstone-type uranium deposit in the northern margin of Qaidam Basin

  • 1.

    No. 105 Exploration Team, Qinghai Bureau of Coal Geological Exploratio, Xining 810007, Qinghai, China

  • 2.

    Key Laboratory of the Northern Qinghai-Tibet Plateau Geological Processes and Mineral Resources, Xining 810012, Qinghai, China

  • 3.

    State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China

  • 4.

    Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

  • 5.

    Tianjin Geological Survey Center of China Geological Survey, Tianjin 300170, China

    • Fund Project: Supported by Key Laboratory of the Northern Qinghai-Tibet Plateau Geological Processes and Mineral Resources (No. 2019-KY-04), the project of China Geological Survey(No. DD20160127), the Natural Science Foundation of Qinghai Provincial Department of Science and Technology (No. 2018-ZJ-779) and Qinghai-Tibet Plateau secondary research (No. 2019QZKK0702)
More Information
  • Author Bio: HUANG Guangnan, male, born in 1989, master, engineer, engaged in survey of uranium geology and Unconventional energy exploration; E-mail: 904223995@qq.com
  • Corresponding author: HUANG Guangwen, male, born in 1991, doctoral candidate, engaged in the exploration and research of uranium geology; E-mail: 807334699@qq.com 
Received Date:  05 June 2020
Revised Date:  01 June 2021
Publish Date:  25 August 2021
    Abstract

  • The Lenghu sandstone-type uranium deposit is the newly discovered industrial deposit in the northern margin of Qaidam basin. Based on the field geological survey, the ore-bearing rocks in the Dameigou Formation in this area were studied by means of polarizing microscope and electron probe analysis to further clarify the characteristics of uranium source, petrology and mineralogy of Lenghu sandstone-hosted uranium deposit. Results show that the ore-bearing rocks in the Dameigou Formation are mainly (silty) sandy mudstone and thin layer coal and fine-grained quartz greywacke, accompanied with a series of epigenetic alteration phenomena. The Lower Proterozoic Dakendaban Group and Hercynian granite in the northeastern part of the study area provide abundant uranium sources for uranium mineralization. The uranium minerals in this deposit are mainly pitchblende and minor adsorption state of uranium. In general, the pitchblende occurs in irregular granular, stellate, "beadlike, linear" and powdery forms at the edge of pyrite, in the crack or on the contact between pyrite and calcite. The adsorbed uranium mainly occurs in the carbon chips and coal lines. The pitchblende deposit is the first exposed and discovered independent uranium mineral in the northern margin of Qaidam basin, which generally fills the blank of no independent uranium mineral exposed in this area. The presence of calcite in ore-bearing layer indicates that the uranium mineralization fluid is rich in CO2, H2O etc. volatile and mineralizer. In addition, many exposed reducing medium (oil and gas, carbon and pyrite, etc.) provides reductant required for REDOX reaction of this type of deposit, which eventually reduces U6+ to U4+ and results in precipitation of pitchblende.

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