西藏罗布莎豆荚状铬铁矿中发现超高压矿物柯石英

杨经绥; 白文吉; 方青松; 颜秉刚; 戎合; 陈松永

Volume 29 Issue 6

Jun. 2004

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Article Navigation > Earth Science > 2004 > 29(6): 651-660

YANG Jing-sui, BAI Wen-ji, FANG Qing-song, YAN Bing-gang, RONG He, CHEN Song-yong, 2004. Coesite Discovered from the Podiform Chromitite in the Luobusha Ophiolite, Tibet. Earth Science, 29(6): 651-660.

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YANG Jing-sui, BAI Wen-ji, FANG Qing-song, YAN Bing-gang, RONG He, CHEN Song-yong, 2004. Coesite Discovered from the Podiform Chromitite in the Luobusha Ophiolite, Tibet. Earth Science, 29(6): 651-660.

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Coesite Discovered from the Podiform Chromitite in the Luobusha Ophiolite, Tibet

Received Date: 2004-09-07
Publish Date: 2004-11-25

Abstract

Abstract

Coesite and kyanite are new discovery from the podiform chromitite in the Luobusha ophiolite, which is located (about) 200 km southeast of Lhasa, Tibet, and marks the locus of collision between the Indian and Eurasian plates. Coesite-kyanite crystals are acicular and individuals are about (20-40) μm× (4-6) μm in size, forming a 30-50 μm wide rim (around) a 0.7 mm×0.5 mm TiFe alloy. Besides the coesite-kyanite rim, the TiFe alloy core is surrounded by a TiSi outer zone of about 10 μm width, and a native Ti inner zone of about 20-70 μm width. Ti-Mg-K-Na-Ca oxide crystals and Si-(rutile) occur as interstitial materials within the framework formed by coesite and kyanite. Within the TiFe alloy core are some small grains of native Ti and relatively low-Ti TiFe alloy, constituting a myrmekitic texture. The amount of Si, Al and O shows a decreasing trend from rim to core, which suggests that a chemical reaction occurred at the rim of the TiFe alloy. During this reaction new minerals formed with a symplektic texture. The regular variation from native Ti through TiSi to coesite-kyanite and oxide aggregates suggests that the series of minerals were formed by a reaction between native Ti and some silicates, under high pressure and temperature. This reaction probably occurred during the upwelling of a plume which carried TiFe alloy and other minerals from the deep mantle, suggesting that the Luobusha coesite formed during a decrease in pressure, which is in contrast with the coesite formed by increasing pressure in a convergent margin.
- coesite,
- TiFe alloy,
- podiform chromitite,
- Luobusha ophiolite,
- Tibet plateau

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References(65)

References

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Coesite Discovered from the Podiform Chromitite in the Luobusha Ophiolite, Tibet

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