Fluid-mediated metal transport in subduction zones and its link to arc-related giant ore deposits: Constraints from a sulfide-bearing HP vein in lawsonite eclogite (Tianshan, China)

doi:10.1016/j.gca.2013.06.023

	Fluid-mediated metal transport in subduction zones and its link to arc-related giant ore deposits: Constraints from a sulfide-bearing HP vein in lawsonite eclogite (Tianshan, China)
	Li, Ji-Lei 1,2; Gao, Jun 2; John, Timm 3; Klemd, Reiner 1; Su, Wen 2
刊名	GEOCHIMICA ET COSMOCHIMICA ACTA
	2013-11-01
卷号	120 页码:326-362
ISSN号	0016-7037
DOI	10.1016/j.gca.2013.06.023
文献子类	Article
英文摘要	High-pressure (HP) veins in eclogites provide insight into element mobility during fluid-rock interaction in subduction zones. Here, we present a petrological-geochemical study of a sulfide-bearing HP vein and its massive lawsonite eclogite host rock from the Chinese Tianshan (ultra-) high-pressure/low-temperature metamorphic belt. The omphacite-dominated vein is enveloped by a garnet-poor, sulfide-bearing eclogite-facies reaction selvage. Lawsonite, garnet, omphacite, glaucophane and other HP minerals occur as inclusions in pyrite porphyroblasts of the selvage rock, indicating that the selvage formed prograde under eclogite-facies conditions. Relicts of wall-rock garnet (Grt_I) cores in recrystallized selvage garnet (Grt_II) close to the wall rock and the Ca distribution in Grt_II, which images the overgrown selvage matrix, indicate that the selvage formed due to dissolution-precipitation processes as a consequence of fluid-rock interaction of the wall rock eclogite with the vein-forming fluid. The peak metamorphic P-T conditions of the wall-rock eclogite are estimated at ca. 590 degrees C and 23 kbar. Mass-balance calculations indicate that the reaction selvage experienced: (1) a depletion of the large-ion lithophile elements (K-Rb-Ba) of up to 100% relative to their concentrations in the wall-rock eclogite; (2) a moderate depletion of the HREE and some transition metal elements including Fe, Cu, Ni, Zn, Co, Cr, and Mn (10-40%); (3) a significant enrichment of CaO (up to 50-80%), Sr (up to similar to 200%), Pb (up to similar to 170%) and S (up to similar to 210%); (4) a slight to moderate enrichment of the LREE (10-20%) and MREE (0-40%); whereas (5) the HFSE show no significant variations.
WOS关键词	ALMANDINE DIFFUSION COUPLES ; TRACE-ELEMENT MOBILIZATION ; OCEAN ISLAND BASALTS ; ASIAN OROGENIC BELT ; HIGH-PRESSURE VEINS ; P-T PATH ; NW-CHINA ; WESTERN TIANSHAN ; SOUTH TIANSHAN ; ROCK INTERACTION
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000324809000020
资助机构	National Natural Science Foundation of China(41025008 ; National Natural Science Foundation of China(41025008 ; State Key Project for Basic Research of China(2007CB411302) ; State Key Project for Basic Research of China(2007CB411302) ; Deutsche Forschungsgemeinschaft(KL 692/17-2, 3 ; Deutsche Forschungsgemeinschaft(KL 692/17-2, 3 ; DAAD ; DAAD ; 41172066) ; 41172066) ; 23-1) ; 23-1) ; National Natural Science Foundation of China(41025008 ; National Natural Science Foundation of China(41025008 ; State Key Project for Basic Research of China(2007CB411302) ; State Key Project for Basic Research of China(2007CB411302) ; Deutsche Forschungsgemeinschaft(KL 692/17-2, 3 ; Deutsche Forschungsgemeinschaft(KL 692/17-2, 3 ; DAAD ; DAAD ; 41172066) ; 41172066) ; 23-1) ; 23-1) ; National Natural Science Foundation of China(41025008 ; National Natural Science Foundation of China(41025008 ; State Key Project for Basic Research of China(2007CB411302) ; State Key Project for Basic Research of China(2007CB411302) ; Deutsche Forschungsgemeinschaft(KL 692/17-2, 3 ; Deutsche Forschungsgemeinschaft(KL 692/17-2, 3 ; DAAD ; DAAD ; 41172066) ; 41172066) ; 23-1) ; 23-1) ; National Natural Science Foundation of China(41025008 ; National Natural Science Foundation of China(41025008 ; State Key Project for Basic Research of China(2007CB411302) ; State Key Project for Basic Research of China(2007CB411302) ; Deutsche Forschungsgemeinschaft(KL 692/17-2, 3 ; Deutsche Forschungsgemeinschaft(KL 692/17-2, 3 ; DAAD ; DAAD ; 41172066) ; 41172066) ; 23-1) ; 23-1)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/87140]
专题	中国科学院地质与地球物理研究所
通讯作者	Gao, Jun
作者单位	1.Univ Erlangen Nurnberg, GeoZentrum Nordbayern, D-91054 Erlangen, Germany 2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 3.Univ Munster, Inst Mineral, D-48149 Munster, Germany
推荐引用方式 GB/T 7714	Li, Ji-Lei,Gao, Jun,John, Timm,et al. Fluid-mediated metal transport in subduction zones and its link to arc-related giant ore deposits: Constraints from a sulfide-bearing HP vein in lawsonite eclogite (Tianshan, China)[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2013,120:326-362.
APA	Li, Ji-Lei,Gao, Jun,John, Timm,Klemd, Reiner,&Su, Wen.(2013).Fluid-mediated metal transport in subduction zones and its link to arc-related giant ore deposits: Constraints from a sulfide-bearing HP vein in lawsonite eclogite (Tianshan, China).GEOCHIMICA ET COSMOCHIMICA ACTA,120,326-362.
MLA	Li, Ji-Lei,et al."Fluid-mediated metal transport in subduction zones and its link to arc-related giant ore deposits: Constraints from a sulfide-bearing HP vein in lawsonite eclogite (Tianshan, China)".GEOCHIMICA ET COSMOCHIMICA ACTA 120(2013):326-362.