SHRIMP zircon U-Pb age and Nd isotopic study on the Nyainqentanglha;Group in Tibet

doi:10.1360/04yd0183

	SHRIMP zircon U-Pb age and Nd isotopic study on the Nyainqentanglha;Group in Tibet
	Hu, DG 3; Wu, ZH ; Jiang, W ; Shi, YR ; Ye, PS ; Liu, QS
刊名	SCIENCE IN CHINA SERIES D-EARTH SCIENCES
	2005
卷号	48 期号:9 页码:1377-1386
关键词	Nyainqentanglha Group SHRIMP dating Nd isotope neoproterozoic Tibet
ISSN号	1006-9313
DOI	10.1360/04yd0183
英文摘要	The Nyainq (e) over cap ntanglha Group is traditionally viewed as the oldest metamorphic basement in the Lhasa block, but its formation age and tectonic setting remain debate. Zircons extracted from the metamorphic sequence of volcanics and intrusions of the Nyainq (e) over cap ntanglha Group, 10 km west of Nam Cc in northern Lhasa block, have been investigated by cathodoluminescence (CL), backscattered (BSE) and dated by ion microprobe (SHRIMP). We conclude that the U-Pb age of 787 +/- 9 Ma of zircons from the trondhjemite imposes a constraint on maximum protolith age, and minimum formation age of the Nyainqdntanglha Group is constrained by U-Pb age of 748 8 Ma of zircons from the granite. The formation age of the Nyainq (e) over cap ntanglha Group is consistent with sedimentary age of Greater Himalayan rocks, showing that they developed coevally in an arc-basin tectonic setting of Neoproterozoic active continental margin along the northern margin of the India shield. The inherited zircons from the tholetiite and granite give older Pb-207/Pb-206 ages from 947 to 1766 Ma. The positive epsilon(Nd)(t) value indicates that the mafic rocks were derived from the depleted mantle, but contaminated by the older continental crustal material. Integrated Nd model age and U-Pb age data provide excellent evidence for the existence of Mesoproterozoic basement in the Lhasa block during Neoproterozoic time.
学科主题	地质年代学
WOS关键词	ULTRAHIGH-PRESSURE METAMORPHISM ; LHASA BLOCK ; WESTERN ALPS ; GEOCHRONOLOGY ; GEOCHEMISTRY ; EVOLUTION ; PLATEAU ; TERRAIN ; ROCKS ; BELT
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000233073800006
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38098]
专题	中国地质科学院
作者单位	1.Chinese Acad Geol Sci, Isnt Geomech, Beijing 100081, Peoples R China. 2.Chinese Acad Geol Sci, Inst Geol, Beijing SHRIMP Ctr, Beijing 100037, Peoples R China. 3.中国地质科学院地质力学研究所
推荐引用方式 GB/T 7714	Hu, DG,Wu, ZH,Jiang, W,et al. SHRIMP zircon U-Pb age and Nd isotopic study on the Nyainqentanglha;Group in Tibet[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2005,48(9):1377-1386.
APA	Hu, DG,Wu, ZH,Jiang, W,Shi, YR,Ye, PS,&Liu, QS.(2005).SHRIMP zircon U-Pb age and Nd isotopic study on the Nyainqentanglha;Group in Tibet.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,48(9),1377-1386.
MLA	Hu, DG,et al."SHRIMP zircon U-Pb age and Nd isotopic study on the Nyainqentanglha;Group in Tibet".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 48.9(2005):1377-1386.