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Geoscience ›› 2020, Vol. 34 ›› Issue (02): 244-253.DOI: 10.19657/j.geoscience.1000-8527.2020.02.03

• Ore Deposits • Previous Articles     Next Articles

Geological,Geochemical Characteristics and Genesis of the Pegmatite Type Uranium Deposit in Hongshiquan, Gansu Province

WANG Wei1(), WANG Shengyun2, LIU Tao1, LI Tianshi1, CHEN Yunjie1, MA Li1, ZHAO Ruyi1, SONG Zhentao3   

  1. 1. No. 203 Research Institute of Nuclear Industry, Xianyang, Shaanxi 712000, China
    2. Beijing Research Institute of Uranium Geology, Beijing 100029, China
    3. Airborne Survey and Remote Sensing Center of Nuclear Industry, Shijiazhuang,Hebei 050002,China
  • Received:2019-05-18 Revised:2019-10-24 Online:2020-05-25 Published:2020-05-25

Abstract:

Hongshiquan uranium deposit is in the western part of Longshoushan Mountain uranium metallogenic belt in Gansu Province. It is the most typical pegmatite type uranium deposit discovered in China. It has the characteristics of rock mass type mineralization. Uranium mineralization is strictly developed in the interior of pegmatite body and in contact-contaminated zone. A systematic study of the pegmatite of the main ore-bearing rock shows that uranium exists in the form of crystalline uranium ore, pitchblende and uranium black in the Hongshiquan deposit. Initial uranium mineralization was formed in the late stage of Zhongtiaoian (1,735±67) Ma, and part of ore underwent hydrothermal superimposition during Hercynian (356±46) Ma. Crystalline uranium deposits were mainly formed in the early magmatic metallogenic stage, and pitchblende was formed in the late hydrothermal superimposed transformation stage. A “four-in-one” alteration association similar to the Jiling sodium metasomatic uranium deposit was developed, the hydrothermal transformation process is a process of K removal and Na addition.

Key words: pegmatite-type uranium deposit, uranium form, U-Pb age of crystalline uranium deposit, hydrothermal superimposition and transformation, Hongshiquan in Gansu Province

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