Melt components derived from a subducted slab in late orogenic;ore-bearing porphyries in the Gangdese copper belt, southern Tibetan;plateau

doi:10.1016/j.lithos.2004.01.003

	Melt components derived from a subducted slab in late orogenic;ore-bearing porphyries in the Gangdese copper belt, southern Tibetan;plateau
	Qu, XM 3; Hou, ZQ ; Li, YG
刊名	LITHOS
	2004
卷号	74 期号:3-4 页码:131-148
关键词	southern Tibetan plateau gangdese magma arc gangdese copper belt ore-bearing porphyries S and Pb isotopic tracing ore-forming dynamic environment
ISSN号	0024-4937
DOI	10.1016/j.lithos.2004.01.003
英文摘要	A porphyry-type Cu (Mo, An) polymetallic ore belt extends in an E-W direction for >400 km along the Gangdese magma arc in the southern Tibetan plateau. Extensive field investigations and systematic geochemical study, combined with S and Pb isotopic tracing, indicate that Cu polymetallic mineralization of the copper belt is genetically related to late orogenic granitic porphyries formed in a late Himalayan crustal extension stage (18-14 Ma). Geochemistry of the porphyries shows the essential characteristics of adakite and suggests a dominant role of subduction-related components in their genesis. The genesis of these ore-bearing porphyries is mainly related to melt components derived from subducted slabs and has little relationship with fluids released from them. Pb isotopes show a clear linear array in the plumbotectonics model and are manifested by a progressive variation from orogenic Pb in the east segment of the copper belt to mantle Pb in the west segment, fort-ning a mixing line of Indian Oceanic MORB and Indian Oceanic sediments. This suggests that the porphyry magma dominantly originated from partial melting of subducted oceanic crust and was mixed with a minor melts of sediments and mantle wedge components. (C) 2004 Elsevier B.V. All rights reserved.
学科主题	矿床地质
WOS关键词	EAST-WEST EXTENSION ; SHOSHONITIC VOLCANISM ; ISOTOPIC CONSTRAINTS ; TRACE-ELEMENT ; ARC MAGMAS ; COLLISION ; COMPLEX ; ISLAND ; PETROGENESIS ; EVOLUTION
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000221944900002
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/37705]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China. 2.Chengdu Univ Technol, Sichuan 610059, Peoples R China. 3.中国地质科学院矿产资源研究所
推荐引用方式 GB/T 7714	Qu, XM,Hou, ZQ,Li, YG. Melt components derived from a subducted slab in late orogenic;ore-bearing porphyries in the Gangdese copper belt, southern Tibetan;plateau[J]. LITHOS,2004,74(3-4):131-148.
APA	Qu, XM,Hou, ZQ,&Li, YG.(2004).Melt components derived from a subducted slab in late orogenic;ore-bearing porphyries in the Gangdese copper belt, southern Tibetan;plateau.LITHOS,74(3-4),131-148.
MLA	Qu, XM,et al."Melt components derived from a subducted slab in late orogenic;ore-bearing porphyries in the Gangdese copper belt, southern Tibetan;plateau".LITHOS 74.3-4(2004):131-148.