Mayum: an orogenic gold deposit in Tibet, China

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	Mayum: an orogenic gold deposit in Tibet, China
	Jiang, SH (Jiang, Sihong); Nie, FJ (Nie, Fengjun); Hu, P (Hu, Peng); Lai, XR (Lai, Xinrong); Liu, YF (Liu, Yifei)
刊名	ORE GEOLOGY REVIEWS
	2009
卷号	36 期号:1-3 页码:160-173
关键词	Orogenic deposit (40)Ar/(39)Ar age dating Sulfur and lead isotopes Fluid inclusions Mayum gold deposit Tibet
ISSN号	0169-1368
英文摘要	Located in western Tibet, China, the Mayum orogenic gold deposit was discovered in 2002 with estimated resources of >80 tonnes gold. The gold mineralization is hosted by Neoproterozoic-Cambrian schists, and is controlled by nearly parallel E-W trending bedding-concordant fracture zones. The Au orebodies are composed of auriferous quartz veins and altered rocks, with the Au grades ranging from 2.23 g/t to 69.56 g/t, and containing <3 vol.% sulfides. The delta(34)S values of 18 separates of sulfides from auriferous quartz veins show a large variation from -0.2 to + 16.8 parts per thousand. The lead isotope compositions of sulfides from the gold ore are characterized by highly radiogenic values and very wide ranges of ratios 18.324 to 20.819 for (206)Pb/(204)Pb, 15.679 to 15.856 for (207)Pb/(204)Pb, and 38.401 to 41.204 for (208)Pb/(204)Pb. These data indicate that lead and sulfur in the quartz veins have multiple sources, and were derived from the different wall rocks as the fluid flowed through them. Fluid inclusions indicate that the ore fluid was CO(2)-rich, with salinities mainly between 1 and 6 wt.% NaCl equiv, and homogenization temperatures predominantly ranging from 260 to 280 degrees C. The delta(18)O values for quartz from auriferous veins range from 13.7 to 16.3 parts per thousand, and the calculated delta(18)O(H2O) values in equilibrium with quartz vary from 5.54 to 9.48 parts per thousand. It suggests that the ore fluid may be derived from deep, metamorphic deep-crustal gold-transporting fluids, although a contribution from magmatic source cannot be ruled out. (40)Ar/(39)Ar age dating on the sericite from the alteration associated with the auriferous quartz veins in the Mayum gold deposit gives a plateau-like age of 59.34+/-0.62 Ma, later than the onset of the Indo-Asian collision. It is believed the gold mineralization was related to the Indo-Asian collision, and was formed during the early stage of orogenesis. (C) 2009 Elsevier B.V. All rights reserved.
学科主题	矿床地质
WOS关键词	WESTERN-AUSTRALIA ; HEBEI PROVINCE ; YILGARN BLOCK ; MINERALIZATION ; EVOLUTION ; CORDILLERA ; SYSTEMS ; FLUIDS ; BELTS ; GEOCHRONOLOGY
WOS研究方向	Geology ; Mining & Mineral Processing
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000271411200009
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38870]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Jiang, SH ,Nie, FJ ,Hu, P ,et al. Mayum: an orogenic gold deposit in Tibet, China[J]. ORE GEOLOGY REVIEWS,2009,36(1-3):160-173.
APA	Jiang, SH ,Nie, FJ ,Hu, P ,Lai, XR ,&Liu, YF .(2009).Mayum: an orogenic gold deposit in Tibet, China.ORE GEOLOGY REVIEWS,36(1-3),160-173.
MLA	Jiang, SH ,et al."Mayum: an orogenic gold deposit in Tibet, China".ORE GEOLOGY REVIEWS 36.1-3(2009):160-173.