Rare earth element geochemistry of the Woxi W-Sb-Au deposit, Hunan Province, South China

doi:10.1016/j.oregeorev.2005.01.003

	Rare earth element geochemistry of the Woxi W-Sb-Au deposit, Hunan Province, South China
	Gu, Xuexiang ; Schulz, Oskar ; Vavtar, Franz ; Liu, Jianming ; Zheng, Minghua ; Fu, Shaohong
刊名	ORE GEOLOGY REVIEWS
	2007-04-01
卷号	31 期号:1-4 页码:319-336
关键词	rare earth element geochemistry stratiform W-Sb-Au deposit sedimentary exhalation ore genesis Woxi South China
ISSN号	0169-1368
DOI	10.1016/j.oregeorev.2005.01.003
文献子类	Review
英文摘要	The Woxi W-Sb-Au deposit in Hunan, South China, is hosted by Proterozoic metasedimentary rocks, a turbiditic sequence of slightly metamorphosed (greenschist facies), gray-green and purplish red graywacke, siltstone, sandy slate, and slate. The mineralization occurs predominantly (> 70%) as stratabound/stratiform ore layers and subordinately as stringer stockworks. The former consists of rhythmically interbedded, banded to finely laminated stibnite, scheelite, quartz, pyrite and silty clays, whereas the latter occurs immediately beneath the stratabound ore layers and is characterized by numerous quartz+pyrite+gold+scheelite stringer veins or veinlets that are typically either subparallel or subvertical to the overlying stratabound ore layers. The deposit has been the subject of continued debate in regard to its genesis. Rare earth element geochemistry is used here to support a sedimentary exhalative (sedex) origin for the Woxi deposit. The REE signatures of the metasedimentary rocks and associated ores from the Woxi W-Sb-Au deposit remained unchanged during post-depositional processes and were mainly controlled by their provenance. The original ore-forming hydrothermal fluids, as demonstrated by fluid inclusions in quartz from the banded ores, are characterized by variable total REE concentrations (3.5 to 136 ppm), marked LREE enrichment (La-N/Yb-N=28-248, Sigma LREE/Sigma HREE=16 to 34) and no significant Eu-anomalies (Eu/Eu=0.83 to 1.18). They were most probably derived from evolved seawater that circulated in the clastic sediment pile and subsequently erupted on the seafloor. The bulk banded ores are enriched in HREE (La-N/Yb-N=4.6-11.4, Sigma LREE/Sigma HREE=3 to 14) and slightly depleted in Eu (Eu/Eu=0.63 to 1.14) relative to their parent fluids. This is interpreted as indicating the influence of seawater rather than a crystallographic control on REE content of the ores. Within a single ore layer, the degree of HREE enrichment tends to increase upward while the total REE concentrations decrease, reflecting greater influence and dilution of seawater. There is a broad similarity in chondrite-normalized REE patterns and the amount of REE fractionation of the banded ores in this study and exhalites from other sedex-type polymetallic ore deposits, suggesting a similar genesis for these deposits. This conclusion is in agreement with geologic evidence supporting a syngenetic (sedex) model for the Woxi deposit. (c) 2006 Elsevier B.V. All rights reserved.
WOS关键词	EAST PACIFIC RISE ; MID-ATLANTIC RIDGE ; PLASMA-MASS SPECTROMETRY ; HYDROTHERMAL FLUIDS ; AQUEOUS GEOCHEMISTRY ; SULFIDE DEPOSIT ; CRUSTAL EVOLUTION ; BRITISH-COLUMBIA ; BROKEN-HILL ; METASEDIMENTARY ROCKS
WOS研究方向	Geology ; Mineralogy ; Mining & Mineral Processing
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000245847500014
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/68448]
专题	中国科学院地质与地球物理研究所
通讯作者	Gu, Xuexiang
作者单位	1.China Univ Geosci, Coll Earth Sci & Resources, Beijing 100083, Peoples R China 2.Chinese Acad Sci, Inst Geochem, Guiyang 550002, Peoples R China 3.Univ Innsbruck, Inst Mineral & Petrog, A-6020 Innsbruck, Austria 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100101, Peoples R China 5.Chengdu Univ Technol, Coll Earth Sci, Chengdu 610059, Peoples R China
推荐引用方式 GB/T 7714	Gu, Xuexiang,Schulz, Oskar,Vavtar, Franz,et al. Rare earth element geochemistry of the Woxi W-Sb-Au deposit, Hunan Province, South China[J]. ORE GEOLOGY REVIEWS,2007,31(1-4):319-336.
APA	Gu, Xuexiang,Schulz, Oskar,Vavtar, Franz,Liu, Jianming,Zheng, Minghua,&Fu, Shaohong.(2007).Rare earth element geochemistry of the Woxi W-Sb-Au deposit, Hunan Province, South China.ORE GEOLOGY REVIEWS,31(1-4),319-336.
MLA	Gu, Xuexiang,et al."Rare earth element geochemistry of the Woxi W-Sb-Au deposit, Hunan Province, South China".ORE GEOLOGY REVIEWS 31.1-4(2007):319-336.