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Geoscience ›› 2022, Vol. 36 ›› Issue (02): 672-681.DOI: 10.19657/j.geoscience.1000-8527.2022.02.28

• Ore Deposits • Previous Articles     Next Articles

Geochemical Characteristics and SHRIMP Zircon U-Pb Geochronology of Quartz Schist from the Dawudian Graphite Deposit in Urad Middle Banner, Inner Mongolia

YANG Peiqi1,2(), LIU Jingdang1,3, LIU Shumei3, YANG Fei2, YANG Xiaowei2   

  1. 1. School of Mining, Liaoning Technical University,Fuxin,Liaoning 123000,China
    2. No.104 Exploration Team of Non-ferrous Geology of Liaoning Co.Ltd.,Yinkou,Liaoning 115007,China
    3. Chemical Geological Exploration Institute of Liaoning Co.Ltd.,Jinzhou,Liaoning 121007,China
  • Received:2021-03-11 Revised:2021-10-28 Online:2022-04-10 Published:2022-06-01

Abstract:

Dawudian graphite deposit of Urad Middle Banner in Inner Mongolia occurs in black rock series of Jianshan Formation of Mesoproterozoic Bayan Obo Group. Ore-bearing rocks consist of andalusite-sericite-chloritequartz-schist and sericite-chlorite-quartz-schist. This paper carried out SHRIMP U-Pb dating analysis for graphite, suggesting that sedimentary ages of the graphite ore deposit is less than (1,792.09±17.12) Ma. Petrological and geochemical study of ore-bearing rocks shows that the ore-bearing rocks are characterized by enrichment of LILE, indicating a stable reduced sedimentary environment. Ore-bearing formation also presents sedimentary characteristic of littoral neritic environment. It can be concluded in this study that the graphite deposit belongs to metamorphic amorphous graphite ore deposit resulting from thermal contact of intrusive rocks to sedimentary rock series.

Key words: graphite deposit, quartz schist, geochemistry, zircon SHRIMP U-Pb geochronology, Dawudian, Inner Mongolia

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