N_2-Ar-He systematics and source of ore-forming fluid in Changkeng Au-Ag deposit, central Guangdong, China

查看全文 作　　者：孙晓明;孙凯;陈炳辉;陈敬德;David [1]I.Norman

机构地区：[1]Department of Earth & Environmental Sciences, New Mexico Institute of Mining and Technology (NMT), Socorro, NM87801

出　　处：《Science China Earth Sciences》索引1999年第42卷第5期,共8页

基　　金：Project supported by the National Natural Science Foundation of China (Grant No. 49502029);the Natural Science Foundation of Zhongshan University; Research Foundation of National Key Laboratory of Metallogenesis in Nanjing University (Grant No. 039 摘　　要：Changkeng Au-Ag deposit is a newly-discovered new type precious metal deposit. N₂-Ar-He systematics studies and ³He/⁴He and δD-δ¹⁸O composition analyses show that the ore-forming fluid of the deposit is composed mainly of formation water (sedimentary brine) but not of meteoric water, which was thought to be source of the ore-forming fluid by most previous researchers. The content of mantle-derived magmatic water in the ore-forming fluid is quite low, usually lower than 10%. According to the source of the ore-forming fluid, the Changkeng Au-Ag deposit should belong to sedimentary brine transformed deposits. From the Late Jurassic to the Early Cretaceous Period, with deposition and accumulation of thick sediments in Sanzhou Basin, the formation water in the sedimentary layers was expelled from the basin because of overburden pressure and increasing temperature. The expelled fluid moved laterally along sedimentary layers to the margin of the basin, and finally moved upward along a gently-dipping 关键词：ORE-FORMING fluid N2-Ar-He SYSTEMATICS 3He/4He and δD-δ18O composition formation water (sedimentary brine) CHANGKENG AU-AG deposit.

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N_2-Ar-He systematics and source of ore-forming fluid in Changkeng Au-Ag deposit, central Guangdong, China

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