Coesite eclogite facies metamorphic tectonite: Evidence for ultrahigh pressure deformation

	Coesite eclogite facies metamorphic tectonite: Evidence for ultrahigh pressure deformation
	Zhao, ZY; Fang, AM; Yu, LJ
刊名	CHINESE SCIENCE BULLETIN
	2002-08-01
卷号	47 期号:16 页码:1388-1392
关键词	metamorphic tectonite ultrahigh pressure metamorphic rocks coesite eclogite
ISSN号	1001-6538
文献子类	Article
英文摘要	An ultrahigh pressure ductile shear melange crops out on the beach of Yangkou Bay near Qingdao City. The melange is composed of weakly deformed blocks in a highly ductilly flow mylonites. Ultrahigh pressure metamorphic (URPM) tectonite includes strongly deformed eclogite and mylonitized eclogite. Coesite occurs in the tectonite as both interstitial mineral and inclusions in garnet and omphacite, indicating that the deformation took place in the stability field of coesite (800-850degreesC, >30 GPa) in the upper mantle. Coesite is rounded or short prismatic grains with undulatory extinction, and often fractured, suggesting brittle deformation. Garnet is also characterized by brittle fractures and sometimes necked and slightly elongated. Omphacite is elongated, with long axis preferred orientation. Undulatory extinction, subgrains and dynamically recrystallized grains suggest plastic flow of omphacite. Ultrahigh pressure metamorphic tectonite was probably formed in the ductile shear zone during the early stage of exhumation of the ultrahigh pressure metamorphic rocks. Its kinematic indicators point to the transport direction of the UHPM slab during the early stage of exhumation.
WOS关键词	DORA-MAIRA MASSIF ; EASTERN CHINA ; NORTHEASTERN JIANGSU ; WESTERN ALPS ; DABIE-SHAN ; TERRANE ; ROCKS ; EXHUMATION ; RHEOLOGY ; PROVINCE
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000177548600014
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/77945]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhao, ZY
作者单位	Chinese Acad Sci, Inst Geol & Geophys, LTE Lab, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Zhao, ZY,Fang, AM,Yu, LJ. Coesite eclogite facies metamorphic tectonite: Evidence for ultrahigh pressure deformation[J]. CHINESE SCIENCE BULLETIN,2002,47(16):1388-1392.
APA	Zhao, ZY,Fang, AM,&Yu, LJ.(2002).Coesite eclogite facies metamorphic tectonite: Evidence for ultrahigh pressure deformation.CHINESE SCIENCE BULLETIN,47(16),1388-1392.
MLA	Zhao, ZY,et al."Coesite eclogite facies metamorphic tectonite: Evidence for ultrahigh pressure deformation".CHINESE SCIENCE BULLETIN 47.16(2002):1388-1392.