| 地幔内超高压矿物的爆炸 |
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| 关键词:mantle ultrahigh pressure mineral ophiolite Tibet |
| 基金项目:中国自然科学基金委员会资助项目的部分成果，项目号:49972073 |
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| Explosion of Ultrahigh Pressure Minerals in the Mantle |
| The microexplosion structure (cobweb structure) of ultrahigh pressure minerals was found for the first time in podiform chromitites within the mantle peridotite facies of Luobusa ophiolite along the Yarlung Zangbo suture zone. The explosion structures of high-energy silicate inclusions are commonly seen in thin sections. In explosion structure, chrome-spinel fragments are irregularly scattered in silicate minerals. With sharp edges and highly varied sizes, they are very unevenly distributed, showing distinct extention micro-brecciated structure. In addition, there are many tensional microfractures around the explosion silicate inclusions. It is inferred that, before explosion, the primary mantle minerals were hydrous magnesium silicate or magnesium-aluminium silicates. When such high-energy phase rose and passed the "water line" as a result of the action of mantle plume, explosion took place, accompanied by the release of water. The upward migration of large-sized high energy hydrous minerals may lead to deep-focus earthequakes. |
| BAI Wen-ji,YANG Jing-rui,FANG Qing-song,YAN Bing-gang,ZHANG Zhong-ming.2001.Explosion of Ultrahigh Pressure Minerals in the Mantle[J].Acta Geoscientica Sinica,22(5):385-390. |
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