Genesis of the Guanfang copper deposit in the Yunxian-Jinggu volcanic;arc, western Yunnan: Evidences from fluid inclusions and geochronology

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	Genesis of the Guanfang copper deposit in the Yunxian-Jinggu volcanic;arc, western Yunnan: Evidences from fluid inclusions and geochronology
	Chen Li 2; Wang LiQuan ; Wang BaoDi ; Liu Han
刊名	ACTA PETROLOGICA SINICA
	2013
卷号	29 期号:4 页码:1279-1289
关键词	LA-ICPMS zircon U-Pb dating Fluid inclusions Guanfang copper deposit Yunxian-Jinggu volcanic arc Western Yunnan
ISSN号	1000-0569
英文摘要	The Guanfang copper deposit is located in the north part of Yunxian-Jinggu volcanic arc. Disseminated Cu ores and veirilets are hosted in the Xiaodingxi Formation almond-shaped basalt, basaltic breccia and associated fractures. We first report a precise zircon U-Pb age of 234. 3 +/- 0. 8Ma of the basalt from the Xiaodingxi Formation. This age indicates that the Xiaodingxi Formation is Middle Triassic, different with previously accepted of Late Triassic. Petrography, microthermometry and Laster Raman spectra studies on fluid inclusions in quartz and calcite indicate that at least two mineralizing episodes occurred in the Guanfang Cu deposit: the volcanic-subvolcanic hydrothermal mineralization during Middle Triassic and the groundwater hydrothermal (possibly genozoic) overprinting. In combination with the evolution history of the Yunxian-jinggu volcanic arc, we conclude that the Middle Triassic Xiaodingxi basalt and Manghuai rhyolite formed bimodal volcanic rock assemblage. The Guanfang Cu deposit occurs in the mafic volcanic rocks in rift basin with marine-continent-alternating sedimentary conditions. It has VHMS features in the early mineralization stage. Due to lack "brine pool", the place that hydrothermal ore-forming fluids accumulation, the Guangfang Cu deposit only occurs veinlet, networks and breccia bodies in volcanic path at the deposit bottom but no massive stratiformed ore bodies at the surface. The deposit overprinted by groundwater hydrothermal fluids at the late mineralization stage.
学科主题	矿床地质
WOS关键词	LA-ICP-MS ; NACL-H2O SOLUTIONS ; TRACE-ELEMENTS ; ZIRCON
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000318260300014
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39986]
专题	中国地质调查局成都地质调查中心
作者单位	1.Chengdu Inst Geol & Mineral Resources, Chengdu 610081, Peoples R China. 2.中国地质调查局成都地质调查中心
推荐引用方式 GB/T 7714	Chen Li,Wang LiQuan,Wang BaoDi,et al. Genesis of the Guanfang copper deposit in the Yunxian-Jinggu volcanic;arc, western Yunnan: Evidences from fluid inclusions and geochronology[J]. ACTA PETROLOGICA SINICA,2013,29(4):1279-1289.
APA	Chen Li,Wang LiQuan,Wang BaoDi,&Liu Han.(2013).Genesis of the Guanfang copper deposit in the Yunxian-Jinggu volcanic;arc, western Yunnan: Evidences from fluid inclusions and geochronology.ACTA PETROLOGICA SINICA,29(4),1279-1289.
MLA	Chen Li,et al."Genesis of the Guanfang copper deposit in the Yunxian-Jinggu volcanic;arc, western Yunnan: Evidences from fluid inclusions and geochronology".ACTA PETROLOGICA SINICA 29.4(2013):1279-1289.