Isotopic characteristics and key factors favoring the formation of Fuwan super-large silver deposit in Guangdong Province
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- 作者：Liang Huaying (1)
Yu Hengxiang (2)
Xia Ping (1)
Wang Xiuzhang (1)
Cheng Jingping (1) - 刊名：Chinese Journal of Geochemistry
- 出版年：2004
- 出版时间：October 2004
- 年：2004
- 卷：23
- 期：4
- 页码：293-300
- 全文大小：648KB
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Yu Hengxiang (2)
Xia Ping (1)
Wang Xiuzhang (1)
Cheng Jingping (1)
1. Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry & South China Sea Institute of Oceanology, Chinese Academy of Sciences, 510640, Wushan, Guangzhou, China
2. Guilin Institute of Technology, 541004, Guilin, China - ISSN：1993-0364
文摘
Rb?Sr isochron age of fluid inclusions in quartz from the Fuwan super-large silver deposit is 68±6 Ma, the silver deposit is characterized by high μ values (10.67-0.95), which are much higher than those of the ore-hosted Paleozoic strata and are close to those of ores hosted in the Proterozoic metamorphic basement in western Guangdong Province. Based on the Pb isotopic characteristics, coupled with much high background silver contents (200-000 ng/g) in the Proterozoic basement and relatively low silver contents in the Paleozoic strata in the region of the Sanshui Basin, it is concluded that the ore-forming material of the super-large silver deposit came mainly from the old basement. The super-large silver deposit related genetically to the intense volcanic activities during the Upper Cretaceous to Eogene. The formation of the Fuwan super-large silver deposit is controlled by the following favorable geological conditions: (1) The intersection of deep faults and contemporaneous faults at the margin of the Sanshui Basin led to the formation of an excellent structure as passageway for ore fluids; (2) The special ore-hosted rock association forms a ore gathering-trap structure that favors the precipitation of ore; (3) The silver-rich old basement, multi-stage mineralization and multi-episode volcanic activities which constitute a geothermal convection system.