铬尖晶石和石榴石的相变: 大陆科学钻探CCSD-PP3孔超镁铁岩超高压变质作用的证据

陈世忠; 杨经绥; 许志琴; 李天福; 陈方远

Volume 31 Issue 4

Jul. 2006

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Article Navigation > Earth Science > 2006 > 31(4): 475-487

CHEN Shi-zhong, YANG Jing-sui, XU Zhi-qin, LI Tian-fu, CHEN Fang-yuan, 2006. Transformation of Chromium Spinel and Garnet: Evidence of CCSD-PP3 Ultramafic Rocks Processed UHP Metamorphism. Earth Science, 31(4): 475-487.

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Transformation of Chromium Spinel and Garnet: Evidence of CCSD-PP3 Ultramafic Rocks Processed UHP Metamorphism

1.
Key Laboratory for Continental Dynamics of MLR, Institute ofGeology, Chinese Academy ofGeological Sciences, Beijing 100037, China
2.
Nanjing Institute of Geology and Mineral Resources, China Geological Survey, Nanjing 210016, China

Received Date: 2006-06-02
Publish Date: 2006-07-25

Abstract

Abstract

The ultramafic rocks in the CCSD-PP3 (China Continental Scientific Drilling) drill-hole consist of dunite and garnet peridotite with a gradual margin between them. The main minerals in the rocks are olivine,chromium spinel,diopside,endiopside,and/or garnet,orthopyroxene,amphibole and phlogopite. Chromium spinels in PP3 ultramafic rocks can be divided into 4 groups with a varied composition,Cr^# (molar 100Cr/(Cr+Mg)) from 51 to 89,which consists of four evolution stages of the ultramafic rocks. The 4 stages are partial melting,eclogite facies,amphibole facies and greenschist facies. When the Cr^# of chrome spinels increases,the Mg^# (molar 100Mg/(Mg+Fe 2+)) of chromium spinels decreases,but oxygen fugacity rises. Compositions of the chromium spinels reflect that the rocks originating from the shallow mantle have subducted to a depth of over 100 km and have then been exhumed to the surface. During the subsequent greenschist-facies and amphibole- facies metamorphism,the chromium spinels lost some Cr,Mg and Al,but gained relatively more Fe.
- garnet peridotite,
- chromium spinel,
- UHP,
- CCSD-PP3,
- Sulu

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References(34)

References

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