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Defect microstructures in garnet, omphacite and symplectite from UHP eclogites, eastern Dabieshan, China: a TEM and FTIR study

Published online by Cambridge University Press:  05 July 2018

Xiuling Wu ,
Dawei Meng ,
Xiaoyu Fan ,
Xin Meng ,
Jianping Zheng  and
Roger Mason
Xiuling Wu
Affiliation:
Faculty of Materials Science and Chemical Engineering, China University of Geosciences, Wuhan 430074, China
Dawei Meng*
Affiliation:
Faculty of Materials Science and Chemical Engineering, China University of Geosciences, Wuhan 430074, China
Xiaoyu Fan
Affiliation:
Faculty of Materials Science and Chemical Engineering, China University of Geosciences, Wuhan 430074, China College of Materials Science and Chemical Engineering, Zhejiang University, Hangzhou 310027, China
Xin Meng
Affiliation:
Imperial College London, Sherfield Building, London SW7 2AZ, United Kingdom
Jianping Zheng
Affiliation:
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
Roger Mason
Affiliation:
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
*
*E-mail: dwmeng@cug.edu.cn
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Abstract

Garnets, omphacite and the minerals of a clinopyroxene/amphibole/plagioclase symplectite in UHP eclogites from Yingshan, Dabieshan have been investigated by TEM and Micro-FTIR. TEM reveals that the predominant microstructures in eclogites and symplectite-forming minerals are chain multiplicity faults (CMFs), dislocation substructures, clusters of water molecules up to ∼50 nm in diameter and recrystallized grains ∼1.75 μm in diameter. This indicates dynamic recrystallization of omphacite, probably during an eclogite-facies metamorphic episode. The deformation structures in symplectite-forming minerals were produced by plastic deformation related to an amphibolite-facies retrograde metamorphic event. CMFs described in the present work demonstrate the existence of an infrequent ½<011> (010) slip system for P2/n omphacite from an UHP eclogite sample from Dabieshan. The frequent occurrence of CMFs in omphacite suggests that they indicate an important deformation mechanism in omphacite and shows that this slip system plays a significant role in the deformation and recovery of eclogite. The hydrous components of deformed minerals may cause plastic deformation of the rocks by dislocation movement and accelerate retrograde metamorphism. Micro-FTIR results show that all the garnets and omphacites contain structural water occurring as hydroxyl groups (OH) or water (H2O). The structural water contents in omphacite range from 110—710 ppm and in garnet from 0—180 ppm. Water released during decompression might supply an early-stage retrograde metamorphic fluid.

Keywords

UHP eclogitegarnet and omphacitesymplectitecluster of water moleculesCMFsTEM and FTIRDabieshan
Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 5 , October 2008 , pp. 1057 - 1069
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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