| 记录地幔中存在氧元素的自然铁-方铁矿组合 |
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| 关键词:native iron wustite eyeball structure mantle ophiolite Tibet |
| 基金项目:国家“973”项目(编号:2003CB716503); 国家重点基础项目(编号:2001CB711001); 地调项目(编号:200313000058) |
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| The Native Iron and Wustite Assemblage: Records of Oxygen Element from the Mantle |
| A very complicated mantle mineral group including the native iron and wustite assemblage was recently discovered in chromitites from the mantle harzburgite of Luobusa ophiolite, Tibet. It is considered that this group was probably derived from the lower mantle and outer core, and then transported to the upper mantle by mantle plume. The assemblage structure shows that the liquid iron from the outer core dissolved some oxygen. When the liquid iron droplets spurted from the outer core into the mantle, they were decomposed into oxygen and iron in the form of immiscibility. Following decompression and ascent of the droplets, wustite (or NiAs structure) was produced by the chemical reaction between the liquid iron and liquid oxygen. When the oxygen was consumed up by the wustite, some holes remained and showed eyeball structures. The eyeball structures might have recorded the history of oxygen activity in the mantle and the Earth's core. |
| BAI Wen-ji,REN Yu-feng,YANG Jing-sui,FANG Qing-song,YAN Bing-gang,RONG He.2006.The Native Iron and Wustite Assemblage: Records of Oxygen Element from the Mantle[J].Acta Geoscientica Sinica,27(1):43-49. |
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