Re-Os dating of pyrite from the Tuolugou stratabound Co(Au) deposit, eastern Kunlun Orogenic Belt, northwestern China

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	Re-Os dating of pyrite from the Tuolugou stratabound Co(Au) deposit, eastern Kunlun Orogenic Belt, northwestern China
	Feng, CY (Feng, Chengyou); Qu, WJ (Qu, Wenjun); Zhang, DQ (Zhang, Dequan); Dang, XY (Dang, Xingyan); Du, AD (Du, Andao); Li, DX (Li, Daxin); She, HQ (She, Hongquan)
刊名	ORE GEOLOGY REVIEWS
	2009
卷号	36 期号:1-3 页码:213-220
关键词	Re-Os isotopic dating Tuolugou deposit Eastern Kunlun Orogenic Belt China
ISSN号	0169-1368
英文摘要	The Tuolugou cobalt-(gold) deposit, in the northeastern margin of the Qinghai-Tibetan plateau and central part of the eastern Kunlun orogenic belt, is the most recently discovered, large, cobalt-(gold) discovery in Qinghai Province, NW China. Exploration to date has identified a cobalt resource of greater than 20,000 t Co, with significant potential for expansion. Mineralization is largely confined to an E-W-striking volcano-sedimentary sequence consisting of four lithological units that underwent extensive greenschist-facies metamorphism and deformation. All orebodies occur in stratiform or lenticular bodies within quartz-albitite and sericite-quartz schists, and are concordant with lithological contacts. The ores contain various amounts of pyrite, the dominant ore mineral, and display massive (>80% pyrite), banded (30 to 50% pyrite), and disseminated (<30% pyrite) textures. The Tuolugou deposit shares striking similarities with other stratabound Cu-Co and Co-Cu-Au deposits in the world (e.g., Blackbird district, U.S.A.; Werner Lake deposit, Canada; Modum district, Norway). Re-Os dating shows that pyrite from different ore types has very low Re and Os concentrations in the range of 0.122-8.988 ppb and 0.003-0.054 ppb, respectively. Isotope data on seven pyrite samples yield an isochron age of 429+/-29 Ma (2 sigma) with an initial (187)OS/(188)Os ratio of 0+/-2 (mean square weighted deviates = 7.9) on the (187)Re/(188)Os-(187)Os/(188)Os plot, which are close to the age of the host strata, suggesting that primary cobalt mineralization in the Tuolugou deposit may have formed from syngenetic-exhalative processes. In addition, our results not only provide new evidence for plate rifting and mineralization taking place during the Early Silurian in the eastern Kunlun orogenic belt, but also suggest that the age of the regionally widespread Nachitai Group is early Paleozoic. (C) 2008 Published by Elsevier B.V.
学科主题	矿床地质
WOS关键词	ISOTOPE SYSTEMATICS ; GOLD MINERALIZATION ; MOLYBDENITE ; AU ; SULFIDE ; CANADA ; AGES ; ORES ; GEOCHRONOLOGY ; PROVINCE
WOS研究方向	Geology ; Mining & Mineral Processing
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000271411200012
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38877]
专题	中国地质调查局
作者单位	Qinghai Geol Survey, Xining 810012, Qinghai, Peoples R China
推荐引用方式 GB/T 7714	Feng, CY ,Qu, WJ ,Zhang, DQ ,et al. Re-Os dating of pyrite from the Tuolugou stratabound Co(Au) deposit, eastern Kunlun Orogenic Belt, northwestern China[J]. ORE GEOLOGY REVIEWS,2009,36(1-3):213-220.
APA	Feng, CY .,Qu, WJ .,Zhang, DQ .,Dang, XY .,Du, AD .,...&She, HQ .(2009).Re-Os dating of pyrite from the Tuolugou stratabound Co(Au) deposit, eastern Kunlun Orogenic Belt, northwestern China.ORE GEOLOGY REVIEWS,36(1-3),213-220.
MLA	Feng, CY ,et al."Re-Os dating of pyrite from the Tuolugou stratabound Co(Au) deposit, eastern Kunlun Orogenic Belt, northwestern China".ORE GEOLOGY REVIEWS 36.1-3(2009):213-220.