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黄金科学技术 ›› 2017, Vol. 25 ›› Issue (6): 1-8.doi: 10.11872/j.issn.1005-2518.2017.06.001

• 矿产勘查与资源评价 •    下一篇

四川甲基卡锂矿区花岗岩体中黑云母的地球化学特征及其地质意义

侯江龙1,李建康1*,王登红1*,陈振宇1,代鸿章1,刘丽君1,2   

  1. 1.中国地质科学院矿产资源研究所,国土资源部成矿作用与资源评价重点实验室,北京   100037;
    2.中国地质大学(北京)地球科学与资源学院,北京   100083
  • 收稿日期:2017-07-11 修回日期:2017-08-23 出版日期:2017-12-30 发布日期:2018-05-18
  • 通讯作者: 李建康(1976-),男,河北保定人,研究员,从事矿床学研究工作。Li9968@126.com
  • 作者简介:侯江龙(1988-),男,河北邢台人,博士研究生,从事矿床学及构造成矿学研究工作。houjianglong1988@126.com
  • 基金资助:

    中国地质调查局项目“华南重点矿集区稀有稀散和稀土矿产调查”(编号:DD20160056)、“川西甲基卡大型锂矿资源基地综合调查评价”(编号:DD20160055)和“中国矿产地质与成矿规律综合集成和服务(矿产地质志)”(编号:DD20160346)联合资助

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

摘要:

四川康定甲基卡锂矿是一座超大型锂矿,也是我国硬岩型锂矿资源最丰富的地区之一。运用电子探针(EMPA)对甲基卡二云母花岗岩中黑云母的化学成分进行分析,进而对二云母花岗岩体形成的氧逸度、温度和压力等物理化学条件进行重点研究。电子探针分析结果表明,甲基卡二云母花岗岩中黑云母为高铁黑云母,具体类型为铁叶云母,所测云母w(Fe2+)/w(Fe2++Mg)比值变化范围较小,表明其未受后期改造,为原生黑云母,可用来估算岩体成岩物理化学条件。根据黑云母地球化学成分计算结果可知,黑云母是在较低氧逸度条件下形成的,其结晶温度为471~541 ℃,压力为432.21~564.86 MPa。黑云母地球化学分析还表明,甲基卡二云母花岗岩属于过铝质花岗岩(包括碰撞型和S型花岗岩),其形成主要与壳源岩浆有关。

关键词: 黑云母, 电子探针(EMPA), 铁叶云母, 氧逸度, 物化条件, 过铝质花岗岩, 二云母花岗岩, 甲基卡

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

中图分类号: 

  • P618.71

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