Petrographic and SHRIMP studies of zircons from the Caledonian Xiongdian Eclogite, northwestern Dabie Mountains

	Petrographic and SHRIMP studies of zircons from the Caledonian Xiongdian Eclogite, northwestern Dabie Mountains
	Jian, P ; Liu, DY ; Yang, WR ; Williams, IS
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2000
卷号	74 期号:4 页码:766-773
关键词	Dabie Mountains Caledonian eclogite SHRIMP analysis
ISSN号	1000-9515
文献子类	Article
英文摘要	The Xiongdian eclogite occurring in the Sujiahe tectonic melange zone at Luoshan County, Henan Province, in the western Dabie Mountains, is typical high-pressure (HP)-ultrahigh-pressure (UHP) and medium temperature eclogite. The occurrence, internal texture and surface characteristics of zircons in eclogite were studied rather systematically petrographically combined with the cathodoluminescence (CL) and scanning electron microscope (SEM) methods. Zircons are mainly hosted in garnet and other metamorphic minerals with sharp boundaries, have a multifaceted morphology and are homogeneous or exhibit a metamorphic growth texture in the interior, thus indicating that they are the product of metamorphism. SHRIMP analyses give zircon Pb-206/U-238 ages of 335 to 424 Ma and show a certain degree of radiogenic Pb loss; therefore it may be inferred that the age of 424+/-5 Ma represents the minimum age of a HP-UHP metamorphic age. From the above analyses coupled with previous Sm-Nd, Ar-40-Ar-39, U-Pb and Pb-207/Pb-206 age data, it is suggested that the peak metamorphic age of the Xiongdian eclogite should be between 424 and 480 Ma. This study further validate the view of the existence of a Caledonian HP-UHP metamorphic event in the western Dabie Mountains.
WOS关键词	METAMORPHISM
WOS研究方向	Geology
语种	英语
出版者	GEOLOGICAL SOC CHINA
WOS记录号	WOS:000166691900004
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/75991]
专题	中国科学院地质与地球物理研究所
通讯作者	Jian, P
作者单位	1.Chinese Acad Sci, Inst Geol, Beijing 100037, Peoples R China 2.China Univ Geosci, Wuhan 430074, Peoples R China 3.Australian Natl Univ, Canberra, ACT 2601, Australia
推荐引用方式 GB/T 7714	Jian, P,Liu, DY,Yang, WR,et al. Petrographic and SHRIMP studies of zircons from the Caledonian Xiongdian Eclogite, northwestern Dabie Mountains[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2000,74(4):766-773.
APA	Jian, P,Liu, DY,Yang, WR,&Williams, IS.(2000).Petrographic and SHRIMP studies of zircons from the Caledonian Xiongdian Eclogite, northwestern Dabie Mountains.ACTA GEOLOGICA SINICA-ENGLISH EDITION,74(4),766-773.
MLA	Jian, P,et al."Petrographic and SHRIMP studies of zircons from the Caledonian Xiongdian Eclogite, northwestern Dabie Mountains".ACTA GEOLOGICA SINICA-ENGLISH EDITION 74.4(2000):766-773.