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学科主题: Geology; Mining & Mineral Processing
题名: Geology and geochemistry of the adjacent Changkeng gold and Fuwang silver deposits, Guangdong Province, South China
作者: Liang, HY ; Xia, P ; Wang, XZ ; Cheng, JP ; Zhao, ZH ; Liu, CQ
通讯作者: lianghy@gig.ac.cn
关键词: Himalayan ; gold ; silver ; Guangdong ; Changkeng ; Fuwang ; China
刊名: ORE GEOLOGY REVIEWS
发表日期: 2007
卷: 31, 期:40547, 页:304-318
收录类别: sci
部门归属: Chinese Acad Sci, Lab Marginal Sea Geol, Inst Geochem, Guangzhou 510640, Peoples R China; Chinese Acad Sci, S China Sea Inst Oceanog, Guangzhou 510640, Peoples R China; Chinese Acad Sci, Inst Geochem, Guiyang 550002, Peoples R China
项目归属: 海洋地质
摘要: The Changkeng Au and Fuwang Ag deposits represent an economically significant and distinct member of the Au-Ag deposit association in China. The two deposits are immediately adjacent, but the Au and Ag orebodies separated from each other. Ores in the Au deposit, located at the upper stratigraphic section and in the southern parts of the orefield, contain low Ag contents (< 11 ppm); the Ag orebodies, in the lower stratigraphic section, are Au-poor (< 0.2 ppm). Changkeng is hosted in brecciated cherts and jasperoidal quartz and is characterized by disseminated ore minerals. Fuwang, hosted in the Lower Carboniferous Zimenqiao group bioclastic limestone, has vein and veinlet mineralization associated with alteration comprised of quartz, carbonate, sericite, and sulfides. Homogenization temperatures of fluid inclusions from quartz veinlets in the Changkeng and Fuwang deposits are in the range of 210 +/- 80 C and 230 +/- 50 degrees C, respectively. Salinities of fluid inclusions from the two deposits range from 1.6 to 7.3 wt. % and 1.6 to 2.6 wt.% equiv. NaCl, respectively. The 8D(H2)O, delta(OH2O)-O-18, delta C-13(CO2), and He-3/He-4 values of the fluid inclusions from the Changkeng deposit range from -80% to -30%, -7.8% to -3.0%, -16.6% to -17.0% and 0.0100 to 0.0054 Ra, respectively. The delta DH2O, delta(OH2O)-O-18, delta C-13(CO2) and He-3/He-4 values of fluid inclusions from the Fuwang deposit range from -59% to -45%, -0.9% to 4.1%, -6.7% to -0.6% and 0.5930 to 0.8357 Ra, respectively. The delta DH2O, delta(OH2O)-O-18, delta C-13(CO2) and He-3/He-4 values of the fluid inclusions suggest the ore fluids of the Changkeng Au-ore come from the meteoric water and the ore fluids of the Fuwang Ag-ore are derived from mixing of magmatic water and meteoric water. The two deposits also show different Pb-isotopic signatures. The Changkeng deposit has Pb isotope ratios (Pb-206/Pb-204: 18.580 to 19.251, Pb-207/Pb-204: 15.672 to 15.801, Pb-208/Pb-204: 38.700 to 39.104) similar to those (Pb-206/Pb-204: 18.578 to 19.433, Pb-207/Pb-204: 15.640 to 15.775, Pb-208/Pb-204: 38.925 to 39.920) of its host rocks and different from those (Pb-206/Pb-204: 18.820 to 18.891, Pb-207/Pb-204: 15.848 to 15.914, Pb-208/Pb-204: 39.579 to 39.786) of the Fuwang deposit. The different signatures indicate different sources of ore-forming material. Rb-Sr isochron age (68 +/- 6 Ma) and Ar-40-Ar-39 age (64.3 +/- 0.1 Ma) of the ore-related quartz veins from the Ag deposit indicate that the Fuwang deposit formed during the Cenozoic Himalayan tectonomagmatic event. Crosscutting relationships suggests that Au-ore predates Ag-ore. The adjacent Changkeng and Fuwang deposits could, however, represent a single evolved hydrothermal system. The ore fluids initially deposited Au in the brecciated siliceous rocks, and then mixing with the magmatic water resulted in Ag deposition within fracture zones in the limestone. The deposits are alternatively the product of the superposition of two different geological events. Age evidence for the Fuwang deposit, together with the Xiqiaoshan Tertiary volcanic-hosted Ag deposit in the same area, indicates that the Pacific Coasaal Volcanic Belt in the South China Fold Belt has greater potiental for Himalayan precious metal mineralization than previous realized. (c) Elsevier B.V. All rights reserved.
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WOS记录号: WOS:000245847500013
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4492
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Liang, HY; Xia, P; Wang, XZ; Cheng, JP; Zhao, ZH; Liu, CQ.Geology and geochemistry of the adjacent Changkeng gold and Fuwang silver deposits, Guangdong Province, South China,ORE GEOLOGY REVIEWS,2007,31(40547):304-318
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