First record and timing of UHP metamorphism from zircon in the Xitieshan terrane: Implications for the evolution of the entire North Qaidam metamorphic belt

doi:10.2138/am.2012.4048

	First record and timing of UHP metamorphism from zircon in the Xitieshan terrane: Implications for the evolution of the entire North Qaidam metamorphic belt
	Liu, Xiaochi 1; Wu, Yuanbao 1,2; Gao, Shan 1; Liu, Qian 1; Wang, Hao 1; Qin, Zhengwei 1; Li, Qiuli 2; Li, Xian-hua 2; Gong, Hujun 3
刊名	AMERICAN MINERALOGIST
	2012-07-01
卷号	97 期号:7 页码:1083-1093
关键词	The Xitieshan terrane coesite zircon U-Pb age UHP metamorphism the North Qaidam metamorphic belt
ISSN号	0003-004X
DOI	10.2138/am.2012.4048
文献子类	Article
英文摘要	The Xitieshan terrane is one of four metamorphic terranes in the North Qaidam metamorphic belt, which is an early Paleozoic high-pressure to ultrahigh-pressure (HP-UHP) metamorphic belt in NW China. However, conclusive evidence and precise timing of UHP metamorphism in the Xitieshan terrane have not been well documented. In this study, we report an integrated study of zircon grains from an amphibolite in the Xitieshan terrane in terms of mineral inclusions, trace elements, and U-Pb age systematics. The first record of coesite is reported as an inclusion in a metamorphic zircon, which provides unambiguous evidence for the UHP metamorphism of the Xitieshan terrane. The metamorphic zircon domains have weak or no zoning, very low Th/U ratios, insignificant Eu anomalies, and flat HREE patterns. Zircon grains contain inclusions of garnet, omphacite and rutile, in addition to the coesite inclusion. These inclusions indicate that the metamorphic zircon grains formed under UHP metamorphic conditions. The metamorphic zircon grains were dated by the SIMS and LA-ICPMS methods and yield weighted mean ages of 432 +/- 14 and 441 +/- 9 Ma, respectively. Combined with previous results, the HP-UHP metamorphism of the Xitieshan terrane may have lasted 460-440 Ma with the peak UHP metamorphism at 441 +/- 9 Ma. A compilation of the reported geochronological data reveals that all four terranes of the North Qaidam metamorphic belt might have experienced coeval UHP metamorphism during the early Paleozoic (420-450 Ma), and thus may have suffered a coherent subduction, UHP metamorphism, and exhumation cycle.
WOS关键词	U-PB AGE ; ULTRAHIGH-PRESSURE METAMORPHISM ; TRACE-ELEMENT GEOCHEMISTRY ; WESTERN DABIE MOUNTAINS ; COESITE-BEARING ZIRCONS ; NW CHINA ; TIBETAN PLATEAU ; CONTINENTAL COLLISION ; GARNET-PERIDOTITE ; HP/UHP TERRANE
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	MINERALOGICAL SOC AMER
WOS记录号	WOS:000306150600007
资助机构	Chinese "973" Project(2009CB825006) ; Chinese "973" Project(2009CB825006) ; National Natural Science Foundation of China(41173017 ; National Natural Science Foundation of China(41173017 ; Ministry of Education of China(IRT0441 ; Ministry of Education of China(IRT0441 ; SinoProbe Project from Chinese Geological Survey Bureau(05-04 ; SinoProbe Project from Chinese Geological Survey Bureau(05-04 ; Special Fund for Basic Scientific Research of Central Colleges, China University of Geosciences (Wuhan) ; Special Fund for Basic Scientific Research of Central Colleges, China University of Geosciences (Wuhan) ; 90714010 ; 90714010 ; B07039 ; B07039 ; 1212011120162) ; 1212011120162) ; 40772042) ; 40772042) ; NCET-06-0659) ; NCET-06-0659) ; Chinese "973" Project(2009CB825006) ; Chinese "973" Project(2009CB825006) ; National Natural Science Foundation of China(41173017 ; National Natural Science Foundation of China(41173017 ; Ministry of Education of China(IRT0441 ; Ministry of Education of China(IRT0441 ; SinoProbe Project from Chinese Geological Survey Bureau(05-04 ; SinoProbe Project from Chinese Geological Survey Bureau(05-04 ; Special Fund for Basic Scientific Research of Central Colleges, China University of Geosciences (Wuhan) ; Special Fund for Basic Scientific Research of Central Colleges, China University of Geosciences (Wuhan) ; 90714010 ; 90714010 ; B07039 ; B07039 ; 1212011120162) ; 1212011120162) ; 40772042) ; 40772042) ; NCET-06-0659) ; NCET-06-0659) ; Chinese "973" Project(2009CB825006) ; Chinese "973" Project(2009CB825006) ; National Natural Science Foundation of China(41173017 ; National Natural Science Foundation of China(41173017 ; Ministry of Education of China(IRT0441 ; Ministry of Education of China(IRT0441 ; SinoProbe Project from Chinese Geological Survey Bureau(05-04 ; SinoProbe Project from Chinese Geological Survey Bureau(05-04 ; Special Fund for Basic Scientific Research of Central Colleges, China University of Geosciences (Wuhan) ; Special Fund for Basic Scientific Research of Central Colleges, China University of Geosciences (Wuhan) ; 90714010 ; 90714010 ; B07039 ; B07039 ; 1212011120162) ; 1212011120162) ; 40772042) ; 40772042) ; NCET-06-0659) ; NCET-06-0659) ; Chinese "973" Project(2009CB825006) ; Chinese "973" Project(2009CB825006) ; National Natural Science Foundation of China(41173017 ; National Natural Science Foundation of China(41173017 ; Ministry of Education of China(IRT0441 ; Ministry of Education of China(IRT0441 ; SinoProbe Project from Chinese Geological Survey Bureau(05-04 ; SinoProbe Project from Chinese Geological Survey Bureau(05-04 ; Special Fund for Basic Scientific Research of Central Colleges, China University of Geosciences (Wuhan) ; Special Fund for Basic Scientific Research of Central Colleges, China University of Geosciences (Wuhan) ; 90714010 ; 90714010 ; B07039 ; B07039 ; 1212011120162) ; 1212011120162) ; 40772042) ; 40772042) ; NCET-06-0659) ; NCET-06-0659)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/84200]
专题	中国科学院地质与地球物理研究所
通讯作者	Liu, Xiaochi
作者单位	1.China Univ Geosci, Fac Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 3.NW Univ Xian, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
推荐引用方式 GB/T 7714	Liu, Xiaochi,Wu, Yuanbao,Gao, Shan,et al. First record and timing of UHP metamorphism from zircon in the Xitieshan terrane: Implications for the evolution of the entire North Qaidam metamorphic belt[J]. AMERICAN MINERALOGIST,2012,97(7):1083-1093.
APA	Liu, Xiaochi.,Wu, Yuanbao.,Gao, Shan.,Liu, Qian.,Wang, Hao.,...&Gong, Hujun.(2012).First record and timing of UHP metamorphism from zircon in the Xitieshan terrane: Implications for the evolution of the entire North Qaidam metamorphic belt.AMERICAN MINERALOGIST,97(7),1083-1093.
MLA	Liu, Xiaochi,et al."First record and timing of UHP metamorphism from zircon in the Xitieshan terrane: Implications for the evolution of the entire North Qaidam metamorphic belt".AMERICAN MINERALOGIST 97.7(2012):1083-1093.