2024 Vol. 51, No. 3
Article Contents

AN Guobao, LIU Haibo, FENG Yonglai, XIN Cunlin, CAI Yuqi, HU Juying. 2024. Petrological characteristics and origin of the sandstone−type uranium deposits in the northern Sichuan Basin[J]. Geology in China, 51(3): 881-897. doi: 10.12029/gc20200813001
Citation: AN Guobao, LIU Haibo, FENG Yonglai, XIN Cunlin, CAI Yuqi, HU Juying. 2024. Petrological characteristics and origin of the sandstone−type uranium deposits in the northern Sichuan Basin[J]. Geology in China, 51(3): 881-897. doi: 10.12029/gc20200813001

Petrological characteristics and origin of the sandstone−type uranium deposits in the northern Sichuan Basin

    Fund Project: Supported by the Sichuan Provincial Department of Finance Provincial Public Institution Government Purchase Service Pilot Project in 2017 “Prospect Investigation of Uranium and Graphite Deposits in Northeast Sichuan” (No. (2017)12).
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  • Author Bio: AN Guobao, male, born in 1966, professor–level senior engineer, mainly engaged in mineral exploration; E-mail: 925260954@qq.com
  • Corresponding author: LIU Haibo, male, born in 1994, master candidate, mainly engaged in mineral exploration and geological environment; E-mail: hbliu.nwnu@foxmail.com
  • This paper is the result of mineral exploration engineering.

    Objective

    Uranium resources are China's important strategic resources and energy minerals. The thorough understanding of geological characteristics and metallogenic models of sandstone–type uranium deposits in the northern Sichuan Basin is to the benefit of exploration and development.

    Methods

    The petrological characteristics of sandstone–type uranium deposits are studied through field investigation, rock and mineral identification and geochemical analysis, and the mineralization process is analyzed.

    Results

    The ore–bearing rocks are mainly the calcareous cementation medium–fine–grained sandstone and conglomerate of the Lower Cretaceous Cangxi Formation. Uranium exists in the form of authigenic uranium minerals. Uranium minerals are mainly coffinite, which are in xenomorphic, euhedral and hypautomorphic granular.

    Conclusions

    The metamorphic acidic volcanic rocks and granites of the Tiechuanshan Formation in Micangshan provided the initial uranium source for the formation of sandstone–type uranium deposits in the basin. Uranium migrates in the form of carbonic acid containing uranyl ions in the aqueous solution. The reductive environment of swamps and stagnant water rich in organic matter and pyrite destroys the carbonic acid containing uranyl ions, causing uranium to precipitate and accumulate in the primary diagenesis stage and secondary epigenesis stage.

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