Post-collisional magmatism: Consequences of UHPM terrane exhumation and   orogen collapse, N. Qaidam UHPM belt, NW China

doi:10.1016/j.lithos.2014.10.006

CORC > 北京大学 > 地球与空间科学学院

	Post-collisional magmatism: Consequences of UHPM terrane exhumation and orogen collapse, N. Qaidam UHPM belt, NW China
	Wang, Mengjue ; Song, Shuguang ; Niu, Yaoling ; Su, Li
刊名	lithos
	2014
关键词	Post-collisional magmatism UHPM terrane Exhumation and extensional collapse Mantle upwelling North Qaidam SUBDUCTED CONTINENTAL-CRUST U-PB ZIRCON NORTHERN TIBETAN PLATEAU ULTRAHIGH-PRESSURE TERRANE ND ISOTOPIC EVIDENCE LACHLAN FOLD BELT WESTERN CHINA METAMORPHIC ROCKS CALC-ALKALINE DABIE OROGEN
DOI	10.1016/j.lithos.2014.10.006
英文摘要	Exhumation of subducted slabs and extensional collapse of orogens are the main tectonic processes in ancient and modern continental collisional zones. Magmatism during these two processes may play important roles in understanding reworking and growth of the continental crust We report here that a series of plutonic magmas, including intrusions of two-mica granite, tonalite, granodiorite, biotite monzogranite, porphyritic biotite granite and diorite, as well as contemporaneous mafic dykes, have been recognized in Dulan edogite-bearing terrane, the North Qaidam ultra-high pressure metamorphic (UHPM) belt The magmatism represented by these plutons is temporally similar to 20-30 million years (Mys) younger than the UHPM age, lasting for similar to 40 Mys and derived from different sources with different mechanisms. The magmatism was initiated by exhumation of UHPM terranes during which strongly-peraluminous two-mica granite and metaluminous tonalite were produced respectively by decompression melting of the exhumed UHPM upper and lower continental crust, respectively. The genesis of mafic magmatic enclave (MME)-hosting granodiorite with a clear hybrid signature and coeval biotite monzogranite reflected the upwelling of asthenospheric mantle by extension of lithosphere during the orogen collapse. It was induced by detachment of the subducted lithospheric mantle, which then brought heat and mantle material into continental crust and triggered the partial melting of the exhumed UHPM continental crust, and gave rise to mixing of crustal and mantle melts. Porphyritic biotite granite reflects a late melting event of continental crust Diorite marked by high magnesium content represents mantle melts with slight crustal contamination, which implies that the orogen has been unrooted and collapsed completely. The post-collisional magmatism of the North Qaidam belt provides an improved understanding for the late thermal and tectonic evolution of a UHPM continental collision zone. (C) 2014 Elsevier B.V. All rights reserved.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000347507600012&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Geochemistry & Geophysics; Mineralogy; SCI(E); 8; ARTICLE; sgsong@pku.edu.m; 181-198; 210
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/155369]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Wang, Mengjue,Song, Shuguang,Niu, Yaoling,et al. Post-collisional magmatism: Consequences of UHPM terrane exhumation and orogen collapse, N. Qaidam UHPM belt, NW China[J]. lithos,2014.
APA	Wang, Mengjue,Song, Shuguang,Niu, Yaoling,&Su, Li.(2014).Post-collisional magmatism: Consequences of UHPM terrane exhumation and orogen collapse, N. Qaidam UHPM belt, NW China.lithos.
MLA	Wang, Mengjue,et al."Post-collisional magmatism: Consequences of UHPM terrane exhumation and orogen collapse, N. Qaidam UHPM belt, NW China".lithos (2014).