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Modern Mining ›› 2020, Vol. 36 ›› Issue (12): 24-.

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Geochronology,Geochemistry of the Shenjing Syenitegranite in Mazongshan Area,#br# Beishan Moutain,and Its Geological Significance

GUO Feng 1,2,3 WANG Hongjie 1,2,3 LIU Jia 1,2,3 WANG Weihong 1,2,3   

  1. Institute of Multipurpose Utilization of Mineral Resource,Chinese Academy of Geological Sciences;
    2.National Research Center of Multipurpose Utilization of Nonmetallic Mineral Resource;3.Key Laboratory for
    Polymetallic Ores′ Evaluation and Utilization,Ministry of Natural Resources of the People′s Republic of China;
    4.Northwest China Center for Geosience Innovation
  • Online:2020-12-25 Published:2021-09-28

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Abstract: In order to explore formation age,petrogenesis and tectonic background of Beihan Moutain,the zircon UPb geochronology and geochemistry of the Shenjing syenogranite in the Mazongshan area were studied.The zircon UPb age of syenitegranite is (417.8±6.6) Ma (MSWD=6.8),which was formed in the Late SilurianEarly Devonian.The rock has a characteristics of siliconrich,potassiumrich,weakly peraluminous,the chondritenormalized REE partition curve incline to the right with Eu anomalies of a low degree,enriched in Rb,K,U,and depleted in Nb,P,Ti,the origin of source rock is crust,the tectonic environmental is syn collision and volcanic arc.Combined with the regional tectonic background,the Shenjing syenitegranite is the product of the tectonic environment transition from island arc to syn collision in Late TriassicEarly Devonian.

Key words: syenitegranite,zircon geochronology,geochemistry