Geology, Geochemistry and Minerogenesis of the Shijuligou Zinc-Copper Deposit in Gansu, China

CORC > 中国地质调查局 > 中国地质调查局

	Geology, Geochemistry and Minerogenesis of the Shijuligou Zinc-Copper Deposit in Gansu, China
	Li, WY (Li Wenyuan); Deng, J (Deng Jun); Gao, YB (Gao Yongbao); Guo, ZP (Guo Zhouping); Zhang, ZW (Zhang Zhaowei); Song, ZB (Song Zhongbao)
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2009
卷号	83 期号:6 页码:1052-1063
关键词	northern Qilian Mountains massive sulfide deposit Cyprus-type deposit Shijuligou zinc-copper deposit ophiolite
ISSN号	1000-9515
英文摘要	The Shijuligou deposit was separated by an arcuate ductile shear zone cross the center of the deposit region, resulting in the difference between the southern and northern ore bodies. The lead (Pb) isotopic data of ores of the Shijuligou copper deposit have averages of 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb in 17.634, 15.444, and 37.312, respectively. It has been shown that ore-forming metals originated from intrusive and extrusive rocks in the upper part of ophiolites. The sulfur isotopic data of pyrite and chalcopyrite in the northern part change from +7.61 parts per thousand to +8.09 parts per thousand and +4.95 parts per thousand to +8.88 parts per thousand in the southern part. Isotopes of delta 18O in the Shijuligou copper deposit are between +11.1 parts per thousand and +18.6 parts per thousand, with the calculated delta 18O(H2)O at +0.65 parts per thousand. It is suggested that the mineralized fluid is a mixture of magma fluid, meteorological water, and seawater through circulating and leaching metals from the volcanic rocks. The zircon uranium-lead (U-Pb) dating of gabbro is 457.9 +/- 1.2 Ma, and the lower crossing age of the discordant and concordia curves of pyroxene spilite of zircon is 454 +/- 15 Ma. It is indicated that the Shijuligou deposit formed in a new ocean crust (ophiolite) of the back-arc basin in the late Ordovician. Mineralization should occur in the intermittence period after strong volcanic activity, and the age should be the late Ordovician. Moreover, the mineralization of ophiolite-hosted massive sulfide deposits in the ancient orogenic belt of the late Ordovician in the northern Qilian Mountains was controlled by the primary fault/fracture, with the forming of a metallogenic hydrothermal system by a mixture of volcanic magma fluid and seawater, which circularly leached the metallogenic metals from the volcanic rocks, resulting in their accumulation. The ore bodies were transformed with morphology and metallogenic elements. Jasperoid is an important sign for prospecting such deposits. There were many island arcs in the continent of China. This study provides evidence for understanding and exploration of ophiolite-hosted massive sulfide deposits in western China, especially in the area of northern Qilian Mountains.
学科主题	构造地质学
WOS关键词	MASSIVE SULFIDE DEPOSITS ; MODERN SEA-FLOOR ; HYDROTHERMAL SYSTEM ; OPHIOLITE ; BASIN ; MODELS ; ZIRCON ; PB
WOS研究方向	Geology
语种	英语
出版者	WILEY-BLACKWELL PUBLISHING, INC
WOS记录号	WOS:000272629700003
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38808]
专题	中国地质调查局
作者单位	China Univ Geosci, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Li, WY ,Deng, J ,Gao, YB ,et al. Geology, Geochemistry and Minerogenesis of the Shijuligou Zinc-Copper Deposit in Gansu, China[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2009,83(6):1052-1063.
APA	Li, WY ,Deng, J ,Gao, YB ,Guo, ZP ,Zhang, ZW ,&Song, ZB .(2009).Geology, Geochemistry and Minerogenesis of the Shijuligou Zinc-Copper Deposit in Gansu, China.ACTA GEOLOGICA SINICA-ENGLISH EDITION,83(6),1052-1063.
MLA	Li, WY ,et al."Geology, Geochemistry and Minerogenesis of the Shijuligou Zinc-Copper Deposit in Gansu, China".ACTA GEOLOGICA SINICA-ENGLISH EDITION 83.6(2009):1052-1063.