Adakites from continental collision zones: Melting of thickened lower crust beneath southern Tibet

	Adakites from continental collision zones: Melting of thickened lower crust beneath southern Tibet
	Chung, SL ; Liu, DY ; Ji, JQ ; Chu, MF ; Lee, HY ; Wen, DJ ; Lo, CH ; Lee, TY ; Qian, Q ; Zhang, Q
刊名	GEOLOGY
	2003-11-01
卷号	31 期号:11 页码:1021-1024
关键词	adakite Tibet continental collision lower-crustal melting
ISSN号	0091-7613
文献子类	Article
英文摘要	Adakites are geochemically distinct intermediate to felsic lavas found exclusively in subduction zones. Here we report the first example of such magmas from southern Tibet in an active continental collision environment. The Tibetan adakites were emplaced from ca. 26 to 10 Ma, and their overall geochemical characteristics suggest an origin by melting of eclogites and/or garnet amphibolites in the lower part ( similar to50 km) of thickened Tibetan crust. This lower-crustal melting required a significantly elevated geotherm, which we attribute to removal of the tectonically thickened lithospheric mantle in late Oligocene time. The identification of collisiontype adakites from southern Tibet lends new constraints to not only the Himalayan-Tibetan orogenesis-how and when the Indian lithosphere started underthrusting Asia can be depicted-but also the growth of the early continental crust on Earth that consists dominantly of the tonal ite-trondhjemite-granodiorite suites marked by adalkitic geochemical affinities.
WOS关键词	PLATEAU ; DELAMINATION ; UPLIFT ; EVOLUTION ; MAGMAS ; AMPHIBOLITE ; LITHOSPHERE ; CONSTRAINTS ; SUBDUCTION ; VOLCANISM
WOS研究方向	Geology
语种	英语
出版者	GEOLOGICAL SOC AMERICA, INC
WOS记录号	WOS:000186411100024
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/78277]
专题	中国科学院地质与地球物理研究所
通讯作者	Chung, SL
作者单位	1.Natl Taiwan Univ, Dept Geosci, Taipei, Taiwan 2.Chinese Acad Geol Sci, Inst Geol, Beijing, Peoples R China 3.Peking Univ, Sch Earth & Space Sci, Beijing, Peoples R China 4.Natl Taiwan Univ, Dept Geosci, Taipei, Taiwan 5.Natl Taiwan Normal Univ, Dept Earth Sci, Taipei, Taiwan 6.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Chung, SL,Liu, DY,Ji, JQ,et al. Adakites from continental collision zones: Melting of thickened lower crust beneath southern Tibet[J]. GEOLOGY,2003,31(11):1021-1024.
APA	Chung, SL.,Liu, DY.,Ji, JQ.,Chu, MF.,Lee, HY.,...&Zhang, Q.(2003).Adakites from continental collision zones: Melting of thickened lower crust beneath southern Tibet.GEOLOGY,31(11),1021-1024.
MLA	Chung, SL,et al."Adakites from continental collision zones: Melting of thickened lower crust beneath southern Tibet".GEOLOGY 31.11(2003):1021-1024.