TEM and HRTEM study of microstructures in omphacite from UHP eclogites at Shima, Dabie Mountains, China

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	TEM and HRTEM study of microstructures in omphacite from UHP eclogites at Shima, Dabie Mountains, China
	X. L. Wu ; Y. J. Han ; D. W. Meng ; W. R. Yang ; D. X. Li
刊名	Acta Geologica Sinica-English Edition
	2000
卷号	74 期号:2 页码:154-162
关键词	UHP eclogite omphacite TEM and HRTEM Dabie mountains high-temperature deformation naturally deformed omphacites diopside single-crystal dislocation glide transformation consequences mechanisms rocks shan
ISSN号	1000-9515
中文摘要	Transmission electron microscope (TEM) and high resolution transmission electron microscope (HRTEM) analyses have been performed on omphacite from ultra-high pressure (UHP) eclogites at the locality of Shima, Dabie Mountains, China. TEM reveals that the microstructures consist dominantly of dislocation substructures, including free dislocations, loops, tiltwalls, dislocation tangles and subboundaries. They were produced by high-temperature ductile deformation, of which the main mechanism was dislocation creep. Antiphase domain (APD) boundaries are common planar defects; an age of 470 +/- 6 Ma for UHP eclogite formation has been obtained from the equiaxial size of APDs in ordered omphacites from Shima, coincident with ages given by single-zircon U-Pb dating (471 +/- 2 Ma). HRTEM reveals C2/c and P2/n space groups in different parts of one single omphacite crystal, and no exsolution is observed in the studied samples, which is attributed to rapid cooling. It is suggested that the UHP eclogites underwent a long period of annealing at high temperatures, followed by relatively rapid cooling. These data provide valuable information for the formation and exhumation mechanism of UHP eclogites in the Dabie high-pressure (HP) and UHP metamorphic belt.
原文出处	://WOS:000088935900008
公开日期	2012-04-14
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/37209]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	X. L. Wu,Y. J. Han,D. W. Meng,et al. TEM and HRTEM study of microstructures in omphacite from UHP eclogites at Shima, Dabie Mountains, China[J]. Acta Geologica Sinica-English Edition,2000,74(2):154-162.
APA	X. L. Wu,Y. J. Han,D. W. Meng,W. R. Yang,&D. X. Li.(2000).TEM and HRTEM study of microstructures in omphacite from UHP eclogites at Shima, Dabie Mountains, China.Acta Geologica Sinica-English Edition,74(2),154-162.
MLA	X. L. Wu,et al."TEM and HRTEM study of microstructures in omphacite from UHP eclogites at Shima, Dabie Mountains, China".Acta Geologica Sinica-English Edition 74.2(2000):154-162.