中国东部上地幔岩石相转变及其意义

樊祺诚; 隋建立

Volume 34 Issue 3

May 2009

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FAN Qi-cheng, SUI Jian-li, 2009. Phase Transition of Upper Mantle Rock in Eastern China and Its Significance. Earth Science, 34(3): 387-391.

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FAN Qi-cheng, SUI Jian-li, 2009. Phase Transition of Upper Mantle Rock in Eastern China and Its Significance. Earth Science, 34(3): 387-391.

FAN Qi-cheng, SUI Jian-li, 2009. Phase Transition of Upper Mantle Rock in Eastern China and Its Significance. Earth Science, 34(3): 387-391.

Citation:

FAN Qi-cheng, SUI Jian-li, 2009. Phase Transition of Upper Mantle Rock in Eastern China and Its Significance. Earth Science, 34(3): 387-391.

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Phase Transition of Upper Mantle Rock in Eastern China and Its Significance

Institute of Geology, China Earthquake Administration, Beijing 100029, China

Received Date: 2009-01-12
Publish Date: 2009-05-25

Abstract

Abstract

The rare samples of garnet bearing peridotites (GBPs), either from alkaline volcanics or from orogenic belt, provide important information of the evolution of subcontinental lithospheric upper mantle. Cenozoic volcanic rocks widely spread in eastern China, and GBPs occur in the volcanic fields of Mingxi, Xilong, Hebi, Nüshan, Hannuoba and Chaoerhe. According to the occurrence of spinel, the mantle xenoliths from above volcanic fields can be divided into two groups as Gt peridotite and Gt/Sp peridotite. Electronic probe data reveal the P-T conditions of these xenoiths as (1) Gt peridotite from depths over 70 km, and (2) Gt/Sp peridotite from 55-70 km. Meanwhile, orogenic garnets from Dabie-Sulu UHP belt also facilitate the understanding of the subcontinental lithospheric upper mantle of eastern China. Variations of garnets in the Gt lherzolite from the UHP belt record the evolution of subduction from Al-rich Gt (70-120 km) to Al-poor Gt (> 120-150 km). Garnets and their metamorphic reactions reveal the mantle compositions and evolution in eastern China.
- garnet bearing peridotites,
- UHP metamorphic GBPs,
- P-T condition,
- high P-T experiment on facies transition,
- rocks layers of upper mantle

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References(34)

References

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