The Cambrian initiation of intra-oceanic subduction in the southern   Paleo-Asian Ocean: Further evidence from the Barleik subduction-related   metamorphic complex in the West Junggar region, NW China

doi:10.1016/j.jseaes.2016.03.015

CORC > 北京大学 > 地球与空间科学学院

	The Cambrian initiation of intra-oceanic subduction in the southern Paleo-Asian Ocean: Further evidence from the Barleik subduction-related metamorphic complex in the West Junggar region, NW China
	Liu, Bo ; Han, Bao-Fu ; Xu, Zhao ; Ren, Rong ; Zhang, Jin-Rui ; Zhou, Jing ; Su, Li ; Li, Qiu-Li
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2016
关键词	Intra-oceanic subduction Subduction initiation Cambrian Blueschist West Junggar Paleo-Asian Ocean PHANEROZOIC CRUSTAL GROWTH KYRGYZ TIEN-SHAN U-PB TECTONIC EVOLUTION CONTINENTAL-CRUST GEODYNAMIC IMPLICATIONS NORTH XINJIANG MAKBAL COMPLEX OROGENIC BELT GORNY-ALTAI
DOI	10.1016/j.jseaes.2016.03.015
英文摘要	In this study, we present new evidence from the Barleik subduction-related metamorphic complex in the southern West Junggar region, northwestern China, for the Cambrian initiation of intra-oceanic subduction in the southern Paleo-Asian Ocean. The Barleik metamorphic complex is mainly composed of blueschist and amphibolite blocks within an ophiolitic melange and their protoliths are calc-alkaline andesite and alkali and tholeiitic basalts. The calc-alkaline andesite has a zircon U-Pb age of 502 +/- 2 Ma, obtained from magmatic cores of zircon grains, and shares geochemical features similar to the 515-485 Ma intra-oceanic arc magmatic rocks in the West Junggar region. By contrast, the alkali and tholeiitic basalts have trace element features similar to ocean island and enriched mid-ocean ridge basalts, respectively. Rutile and sodic-calcic amphibole from the amphibolite have a U-Pb age of 502 +/- 25 Ma and a Ar-40/Ar-39 age of, similar to 504 Ma, respectively, which are in good agreement within errors with a Ar-40/Ar-39 age of 492 +/- 4 Ma for phengite from the blueschist. These metamorphic ages of similar to 500 Ma are interpreted to represent the timing of Pacific-type subduction-related metamorphism and are also compatible with ages of the oldest supra-subduction zone ophiolites (531-512 Ma) and intra-oceanic arc plutons (515-485 Ma) in the southern West Junggar region. Being one of the oldest subduction-related metamorphic complexes (509-490 Ma) in the southern Central Asian Orogenic Belt, the Barleik metamorphic complex, together with the oldest arc plutons, definitely indicate the initial intra-oceanic subduction in the southern Paleo-Asian Ocean at least in the Early Cambrian. (C) 2016 Elsevier Ltd. All rights reserved.; National Natural Science Foundation of China [41072168, 41472205, 41222023]; SCI(E); ARTICLE; bfhan@pku.edu.cn; 1-21; 123
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/492265]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Liu, Bo,Han, Bao-Fu,Xu, Zhao,et al. The Cambrian initiation of intra-oceanic subduction in the southern Paleo-Asian Ocean: Further evidence from the Barleik subduction-related metamorphic complex in the West Junggar region, NW China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2016.
APA	Liu, Bo.,Han, Bao-Fu.,Xu, Zhao.,Ren, Rong.,Zhang, Jin-Rui.,...&Li, Qiu-Li.(2016).The Cambrian initiation of intra-oceanic subduction in the southern Paleo-Asian Ocean: Further evidence from the Barleik subduction-related metamorphic complex in the West Junggar region, NW China.JOURNAL OF ASIAN EARTH SCIENCES.
MLA	Liu, Bo,et al."The Cambrian initiation of intra-oceanic subduction in the southern Paleo-Asian Ocean: Further evidence from the Barleik subduction-related metamorphic complex in the West Junggar region, NW China".JOURNAL OF ASIAN EARTH SCIENCES (2016).