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	Lawsonite blueschist in Northern Qilian, NW China: P-T pseudosections and petrologic implications
	Zhang, Lifei ; Wang, Qianjie ; Song, Shuguang
	2009
关键词	Lws-blueschist Pmp-blueschist Ep-blueschist P-T pseudosection Northern Qilian Mountains China CALIFORNIA COAST RANGES NE NEW-CALEDONIA METAMORPHIC EVOLUTION PHASE-RELATIONS PRECAMBRIAN BLUESCHISTS PREHNITE-PUMPELLYITE BEARING METABASITES EPIDOTE-BLUESCHISTS MINERAL EQUILIBRIA OCEANIC SUBDUCTION
英文摘要	The lawsonite-bearing blueschist from the Nine Spring area, Sunan, Northern Qilian Mountains, is a unique well-preserved lawsonite blueschist terrane in China. Based on the dominant Ca-Al hydrosilicate, the lawsonite-bearing blueschists were divided into lawsonite-bearing pumpellyite blueschist, lawsonite blueschist and epidote blueschist with mineral assemblages of Gin (>40%) + Pmp (30%) + Lws (3%) + Chl (10%) + Ab (8%) + Qtz (5%) + Cal (1%), Gln (35-40%) + Lws (35-40%) + Chl (10%) + Ab (10%) + Grt (1-2%) + Zo (<2%) + Qtz (<1%) and Gln (30-35%) + Zo/Czo/Ep (similar to 30%) + Chl (15%) + Ab (15-15%) + Grt (2%) + Qtz (<2%) and Mag (1%), respectively. P-T pseudosections using internally consistent mineral thermodynamic database and Domino/Theriak software yield P-T conditions of 320-350 degrees C, 0.75-0.85 GPa for lawsonite-bearing pumpellyite blueschist, 335-355 degrees C, 0.8-0.95 GPa for lawsonite blueschist and 345-375 degrees C, 0.75-0.85 GPa for epid ote blueschist, respectively. The transition from the lawsonite blueschist facies to epidote blueschist facies is defined by the reaction Lws + Gln = Chl + Czo + Ab + Qtz + H2O. These high-P rocks of the Northern Qilian Mountains have undergone prograde metamorphic P-T path with no retrograde overprinting suggesting a fast subduction and exhumation which is consistent with channel flow model. (C) 2008 Elsevier Ltd. All rights reserved.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000266895800012&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Geosciences, Multidisciplinary; SCI(E); CPCI-S(ISTP); 21
语种	英语
DOI标识	10.1016/j.jseaes.2008.11.007
内容类型	其他
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/155943]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zhang, Lifei,Wang, Qianjie,Song, Shuguang. Lawsonite blueschist in Northern Qilian, NW China: P-T pseudosections and petrologic implications. 2009-01-01.

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