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	Lawsonite-bearing chloritoid-glaucophane schist from SW Tianshan, China: Phase equilibria and P-T path
	Du, Jinxue ; Zhang, Lifei ; Lu, Zeng ; Chu, Xu
	2011
关键词	Lawsonite Chloritoid-glaucophane schist P-T pseudosection SW Tianshan China HIGH-PRESSURE METAMORPHISM NORTH QILIAN OROGEN WESTERN TIANSHAN NW CHINA TECTONIC IMPLICATIONS MINERAL EQUILIBRIA ECLOGITIC ROCKS THERMODYNAMIC DATA MIXING PROPERTIES SUBDUCTION ZONES
英文摘要	Lawsonite-bearing chloritoid-glaucophane schist has been discovered firstly in the high to ultra-high pressure (HP-UHP) metamorphic belt in Southwestern Tianshan, China. It is characterized by the mineral assemblage of lawsonite + chloritoid + glaucophane + phengite + paragonite + epidote/allanite + chlorite + quartz + dolomite/calcite + rutile + tourmaline. Lawsonite and chloritoid exclusively occur as micro-inclusions in the cores and mantles of porphyroblastic glaucophane. The glaucophane is coarse-grained (about 1-20 mm long), and forms euhedral to subhedral crystals with distinct growth zonation. The X(gln) [=Fe(2+)/ (Fe(2+) + Mg)] increases outwards from 0.40 to 0.63, indicating growth under decreasing temperature and pressure. Phase equilibrium modeling in the system of NCKFMASHO (Na(2)O-CaO-K(2)O-FeO-MgO-Al(2)O(3)-SiO(2)-H(2)O-O) by THERMOCALC 3.30 reveals that glaucophane was formed during retrograde metamorphism. Based on the compositional zonation of glaucophane and its mineral inclusions, the peak P-T conditions were 23.2-25.3 kbar and 499-519 degrees C, 17-20 kbar and 430-530 degrees C for the first retrograde stage (A) and 15-17 kbar and 470-530 degrees C for the second retrograde stage (B). The obtained retrograde P-T path indicates a rapid uplift involving an early isothermal decompressional stage similar to that of Alpine-type blueschists. (C) 2011 Elsevier Ltd. All rights reserved.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000294984200010&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.2011.04.003
内容类型	其他
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/155773]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Du, Jinxue,Zhang, Lifei,Lu, Zeng,et al. Lawsonite-bearing chloritoid-glaucophane schist from SW Tianshan, China: Phase equilibria and P-T path. 2011-01-01.

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