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。
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.
出处
《中国地质》
CAS
CSCD
2003年第2期144-150,共7页
Geology in China
基金
国家自然科学基金项目(49972073)
