Discovery of eclogite at northern margin of Qaidam Basin, NW China

Eclogite was first discovered at the northern margin of the Qaidam Basin in this study. It occurs as pods in the gneiss sequence of Middle to Upper Proterozoic age and is mainly composed of garnet, omphacite, phengite and rutile. The garnets contain 44%–62% of almandine, 15%–33% of grossular and 12%...

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Published in:Chinese science bulletin 1998-10, Vol.43 (20), p.1755-1760
Main Authors: Yang, Jingsui, Xu, Zhiqin, Li, Haibing, Wu, Cailai, Cui, Junwen, Zhang, Jianxin, Chen, Wen
Format: Article
Language:English
Subjects:
Eclogite
Garnets
Gneiss
high_pressure
Magnesium aluminum silicates
Metamorphism
Plateau
Qaidam
Qinghai_Xizang
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creator Yang, Jingsui
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description Eclogite was first discovered at the northern margin of the Qaidam Basin in this study. It occurs as pods in the gneiss sequence of Middle to Upper Proterozoic age and is mainly composed of garnet, omphacite, phengite and rutile. The garnets contain 44%–62% of almandine, 15%–33% of grossular and 12%–30% of pyrope molecules, and the omphacites contain 40%–46% of jadeite. Applying garnet-clinopyroxene thermometry and jadeite geobarometry, the peak conditions of eclogite facies metamorphism occurred at about (722±123)°C and at the pressure of up to c. 22 × 108 Pa.
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subjects Eclogite
Garnets
Gneiss
high_pressure
Magnesium aluminum silicates
Metamorphism
Plateau
Qaidam
Qinghai_Xizang
title Discovery of eclogite at northern margin of Qaidam Basin, NW China
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