Metagabbros of the Gangdese arc root, south Tibet: Implications for the growth of continental crust

doi:10.1016/j.gca.2014.01.045

	Metagabbros of the Gangdese arc root, south Tibet: Implications for the growth of continental crust
	Zhang, Zeming 3; Dong, Xin ; Xiang, Hua ; He, Zhenyu ; Liou, J. G.
刊名	GEOCHIMICA ET COSMOCHIMICA ACTA
	2014
卷号	143 页码:268-284
ISSN号	0016-7037
DOI	10.1016/j.gca.2014.01.045
英文摘要	The Gangdese batholith of the southern Tibet is regarded as a principal component of the pre-Himalayan collision, Andean-type continental margin. However, the Gangdese arc root remains poorly understood because most of previous studies concentrated on granitoids from the middle and upper crust of the arc. In this paper, we report new petrochemical and geochronological characteristics of metagabbros occurred as a part of the Late Cretaceous Lilong batholith in the eastern Gangdese arc. The gabbros with protolith ages of similar to 82-95 Ma, underwent slightly late (68-77 Ma) granulite-facies metamorphism and nearly coeval anatexis, typical of lower arc crusts. The metagabbros and diorites of the Lilong batholith show geochemical features of juvenile crust in continental magmatic arcs, and an original magmatic differentiation trend, with gabbros formed as the cumulates, whereas diorites as the crystalline products of evolved magmas. The Lilong batholith forms an arc crustal section with a possible thickness of 20-30 km, and may have an overall andesitic composition, providing a support for the "andesite model" of continental crust growth. (C) 2014 Elsevier Ltd. All rights reserved.
学科主题	变质岩岩石学
WOS关键词	ZIRCON U-PB ; GRANULITE-FACIES METAMORPHISM ; EASTERN HIMALAYAN SYNTAXIS ; SOUTHEASTERN LHASA TERRANE ; NAMCHE-BARWA SYNTAXIS ; NEW-ZEALAND ; ISLAND-ARC ; KOHISTAN ARC ; NORTHERN PAKISTAN ; GARNET GRANULITE
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000344072500016
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40486]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China 2.Liou, J. G.] Stanford Univ, Dept Geol & Environm Sci, Stanford, CA 94305 USA 3.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Zhang, Zeming,Dong, Xin,Xiang, Hua,et al. Metagabbros of the Gangdese arc root, south Tibet: Implications for the growth of continental crust[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2014,143:268-284.
APA	Zhang, Zeming,Dong, Xin,Xiang, Hua,He, Zhenyu,&Liou, J. G..(2014).Metagabbros of the Gangdese arc root, south Tibet: Implications for the growth of continental crust.GEOCHIMICA ET COSMOCHIMICA ACTA,143,268-284.
MLA	Zhang, Zeming,et al."Metagabbros of the Gangdese arc root, south Tibet: Implications for the growth of continental crust".GEOCHIMICA ET COSMOCHIMICA ACTA 143(2014):268-284.