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西藏蛇绿岩中不寻常的地幔矿物群
引用本文:白文吉,杨经绥,方青松,颜秉刚,史仁灯.西藏蛇绿岩中不寻常的地幔矿物群[J].中国地质,2003,30(2):144-150.
作者姓名:白文吉  杨经绥  方青松  颜秉刚  史仁灯
作者单位:中国地质科学院地质研究所,北京,100037
基金项目:国家自然科学基金项目(49972073)
摘    要:在西藏雅鲁藏布江蛇绿岩的铬铁矿中,首次发现由100余种(亚种)矿物组成的地幔矿物群,其中包括:自然元素,合金,氧化物,硫(砷)化物和硅酸盐。根据实验资料,其中一部分是超高压成因矿物。可能来自地球核-幔边界,是地球外核与下地幔底部硅酸盐之间化学反应的产物,另一部分矿物可能来自下地幔,过渡带和上地幔。西藏地幔矿物群,无论在矿物学和地球动力学上均有重要意义。

关 键 词:西藏  蛇绿岩  铬铁矿  地幔矿物群  地球动力学  矿物学  超高压矿物
文章编号:1000-3567(2003)02-0144-07

Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
BAI Wen-ji,YANG Jing-sui,FANG Qing-song,YAN Bing-gang,SHI Ren-deng.Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China[J].Chinese Geology,2003,30(2):144-150.
Authors:BAI Wen-ji  YANG Jing-sui  FANG Qing-song  YAN Bing-gang  SHI Ren-deng
Institution:Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
Abstract:An unusual mantle mineral group consisting of more than100species(or subsp ecies)minerals was dis-covered in chromite from the Yarlung Zangbo ophiolite belt,Tibet.It includes native element minerals,alloys,oxides(arsenides)and silicates.According to expe rimental data,some of the minerals are ultrahigh-pressure min-erals,possibly formed at the Earth' s core-mantle boundary,and are the produ cts of chemical reactions between liquid iron of the Earth' s outer core and sil icates at the base of the lower mantle ;others might be derived from the lower mantle,transitional zone and upper mantle.The mantle mineral group in Tibet has great significance in mineralogy an d geodynamics.
Keywords:ophiolite of Tibet  mantle mineral group  ultrahigh-pressure(UHP)mineral
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