| 西藏蛇绿岩的超高压矿物：FeO、Fe、FeSi、Si和SiO2组合及其地球动力学意义 |
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| 关键词:Tibet ophiolite ultra-high pressure mineral FeO, Fe, FeSi, Si and SiO2 assemblage |
| 基金项目:国家自然科学基金项目(49972073) |
| 作者 | 单位 | | 白文吉 | 中国地质科学院地质研究所,北京,100037 | | 杨经绥 | 中国地质科学院地质研究所,北京,100037 | | 方青松 | 中国地质科学院地质研究所,北京,100037 | | 颜秉刚 | 中国地质科学院地质研究所,北京,100037 | | 张仲明 | 中国地质科学院地质研究所,北京,100037 |
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| 摘要: |
| Ultra-High Pressure Minerals: FeO, Fe, FeSi, Si and SiO2 Assemblage from Ophiolite in Tibet and Its Earth Dynamic Significance |
| The Luobusa ophiolite and its chromite deposits outcrop in the eastern section of the Yarlung Zangbo River ophiolitic zone. About 60～70 types of associated minerals including FeO,Fe, FeSi, Si and SiO 2 have been found from the podiform chromitite in Tibet. Based on high pressure and high temperature experimental data, this mineral assemblage was formed in D″ layer between the outer core and the lower mantle, being a product of chemical reaction between liquid iron of the outer core and magnesian silicate pe rovskite (MgSiO 3) of the lower mantle. The existence of these high pressure minerals implies that the deep mantle activity of ophiolite might have affected the Earth's outer core, and that the chemical reaction between the outer core and the lower mantle might have happened. The ultra high minerals were formed in D″ layer and brought up to the upper mantle by mantle plume generated from D″ layer. |
| BAI Wen-ji,YANG Jing-rui,FANG Qing-song,YAN Bing-gang,ZHANG Zhong-ming.2002.Ultra-High Pressure Minerals: FeO, Fe, FeSi, Si and SiO2 Assemblage from Ophiolite in Tibet and Its Earth Dynamic Significance[J].Acta Geoscientica Sinica,23(5):395-402. |
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