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Gold Science and Technology ›› 2017, Vol. 25 ›› Issue (6): 1-8.doi: 10.11872/j.issn.1005-2518.2017.06.001

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Geochemical Characteristics and Geological Significance of Biotite in Granite Bodies of Jiajika Lithium Mine,Sichuan Province

HOU Jianglong1,LI Jiankang1,WANG Denghong1,CHEN Zhenyu1,DAI Hongzhang1,LIU Lijun 1,2   

  1. 1.MLR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing   100037,China;
    2.School of Earth Science and Resources,China University of Geosciences(Beijing),Beijing   100083,China
  • Received:2017-07-11 Revised:2017-08-23 Online:2017-12-30 Published:2018-05-18

Abstract:

Jiajika lithium deposit is a superlarge deposit in Kangding County of Sichuan Province,and it is one of the most abundant area of lithium mineral resources in China.The chemical composition of biotite in two-mica granite were analyzed by electron microprobe,and the physical and chemical conditions(such as temperature,pressure,oxygen fugacity) of two-mica granite bodies were mainly studied.The results of electron microprobe analysis show that the biotites in Jiajika two-mica granite belong to oxybiotite,and its specific type is siderophyllite.The range of w(Fe2 +)/w(Fe2 ++Mg) ratio of biotite is small,indicating that the biotite is primary bio- tite,and it is not altered by later stage reconstruction,and it can be used to estimate its physical and chemical conditions of rock formation.According to the calculation of geochemical composition of biotite,the biotite was formed under the condition of low oxygen fugacity,the crystallization temperature of biotite is between  471~541 ℃,the pressure is between 432.21~564.86 MPa.The geochemical analysis of biotite also shows that Jiajika two-mica granite belongs to aluminum granite(including collision type and S-type granite),and its formation is mainly related to crustal magma.

Key words: biotite, electron microprobe, siderophyllite, oxygen fugacity, physical and chemical conditions, aluminum granite, two-mica granite, Jiajika

CLC Number: 

  • P618.71

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