Discovery and implication of P2(1)/n crystal structure on a nano-scale in single jadeite crystals

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	Discovery and implication of P2(1)/n crystal structure on a nano-scale in single jadeite crystals
	X. L. Wu; Y. J. Han; D. W. Meng; D. X. Li
	2002
发表期刊	Earth and Planetary Science Letters
ISSN	0012-821X
卷号	197 期号:3-4 页码:165-169
摘要	We present the results of high-resolution transmission electron microscope (HRTEM) studies on jadeite crystals of jadeite quartzite from the Dabie ultra-high-pressure (UHP) metamorphic terrane, China. Although jadeite is known to have only C2/c crystal structure, [100], [110], [112] [010] diffraction patterns and HRTEM images reveal C2/c and P2(1)/n structures in 500 nm microdomains of single jadeite crystals, that we recognized in all the above four orientations. The cell parameters of C2/c crystal structure correspond to those of jadeite, whereas the cell parameters of P2(1)/n structure are equivalent to those of omphacite. The presence of the P2(1)/n structure shows that jadeite partially changed into omphacite on a nano-scale during retrograde metamorphism and that this reaction failed to reach equilibrium. It suggests uplift of the host rock during exhumation accompanied by complex non-equilibrium retrogressive process in the jadeite, with significant implications for the derivation of P-T paths and tectonic interpretation of the Dabie UHP metamorphic terrane. (C) 2002 Elsevier Science B.V. All rights reserved.
部门归属	china univ geosci, testing ctr, wuhan 430074, peoples r china. china univ geosci, fac earth sci, wuhan 430074, peoples r china. acad sinica, inst met res, atom imaging solids lab, shenyang 110015, peoples r china.;wu, xl (reprint author), china univ geosci, testing ctr, wuhan 430074, peoples r china
关键词	Jadeite Omphacite Equilibrium Transmission Electron Microscope Dabie Mountains Sodic Pyroxenes Central China Dabie-shan Petrology Shuanghe Coesite Diamond Rocks
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WOS记录号	WOS:000175551700003
引用统计	被引频次：16[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/36462
专题	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. Discovery and implication of P2(1)/n crystal structure on a nano-scale in single jadeite crystals[J]. Earth and Planetary Science Letters,2002,197(3-4):165-169.
APA	X. L. Wu,Y. J. Han,D. W. Meng,&D. X. Li.(2002).Discovery and implication of P2(1)/n crystal structure on a nano-scale in single jadeite crystals.Earth and Planetary Science Letters,197(3-4),165-169.
MLA	X. L. Wu,et al."Discovery and implication of P2(1)/n crystal structure on a nano-scale in single jadeite crystals".Earth and Planetary Science Letters 197.3-4(2002):165-169.