鄂尔多斯盆地北部铀矿床铀矿物赋存状态及富集机理

谢惠丽; 焦养泉; 刘章月; 李西得; 易超; 荣辉; 万璐璐

doi:10.3799/dqkx.2019.164

Volume 45 Issue 5

May 2020

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Article Navigation > Earth Science > 2020 > 45(5): 1531-1543

Xie Huili, Jiao Yangquan, Liu Zhangyue, Li Xide, Yi Chao, Rong Hui, Wan Lulu, 2020. Occurrence and Enrichment Mechanism of Uranium Ore Minerals from Sandstone-Type Uranium Deposit, Northern Ordos Basin. Earth Science, 45(5): 1531-1543. doi: 10.3799/dqkx.2019.164

Citation:

Xie Huili, Jiao Yangquan, Liu Zhangyue, Li Xide, Yi Chao, Rong Hui, Wan Lulu, 2020. Occurrence and Enrichment Mechanism of Uranium Ore Minerals from Sandstone-Type Uranium Deposit, Northern Ordos Basin. Earth Science, 45(5): 1531-1543. doi: 10.3799/dqkx.2019.164

Citation:

Xie Huili, Jiao Yangquan, Liu Zhangyue, Li Xide, Yi Chao, Rong Hui, Wan Lulu, 2020. Occurrence and Enrichment Mechanism of Uranium Ore Minerals from Sandstone-Type Uranium Deposit, Northern Ordos Basin. Earth Science, 45(5): 1531-1543. doi: 10.3799/dqkx.2019.164

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Occurrence and Enrichment Mechanism of Uranium Ore Minerals from Sandstone-Type Uranium Deposit, Northern Ordos Basin

doi: 10.3799/dqkx.2019.164

1.
Beijing Research Institute of Uranium Geology, Beijing 100029, China
2.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China
3.
Research Institute No.203, CNNC, Xianyang 712000, China

Received Date: 2019-07-08
Publish Date: 2020-05-15

Abstract

Abstract

To gain new insights into metallogenic processes and especially into uranium ore minerals enrichment mechanism, occurrence of uranium ore minerals in uranium deposits of northern Ordos basin, has been analyzed using various analytical techniques including α track radiograph, scanning electron microscope (SEM) and electron microprobe (EMP). It is found that the uranium ore minerals mainly consist of coffinite, a small amount of pitchblende and uranium-bearing titanium mineral in the study area. Primary uranium ore minerals / detrital uranium minerals occur within the lithic fragment, adsorbed on anatase during the sedimentary / diagenetic stage, becoming the pre-enrichment uranium for the uranium reservoir. During the metallogenic stage, uranium ore minerals occur dominantly in the intergranular pores, associated with pyrite and carbonaceous fragments, related to quartz grains and calcite cementation closely, and a small part of which are adsorbed on montmorillonite film coating clastic particles. Besides, pitchblende - hematite - pyrite mineral assemblages, clausthalite (PbSe) and ferroselite (FeSe₂) co-existing with uranium ore minerals with high concentration of REEs, are recognized. Comprehensive analyses indicate that pitchblende is formed at the transitional interface between oxidizing acid fluid and reducing alkaline fluid, favoring the oxidizing acid side during the early metallogenic stage, and coffinite is mainly formed in the reducing alkaline conditions during the late metallogenic stage. The supply of dual uranium sources, abundant reductant, coupling of multi-source fluids, and partial superimposed transformation by hydrothermal fluid have resulted in the formation of large and rich uranium deposits in northern Ordos basin.
- modes of occurrence,
- uranium ore minerals,
- enrichment mechanism,
- uranium deposit,
- Ordos basin,
- deposit geology

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References(70)

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Occurrence and Enrichment Mechanism of Uranium Ore Minerals from Sandstone-Type Uranium Deposit, Northern Ordos Basin

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