Isotopes and Geochronology of the Meixian-type Pb-Zn-(Ag) Deposits, Central Fuji

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Isotopes and Geochronology of the Meixian-type Pb-Zn-(Ag) Deposits, Central Fujian Rift, South China: Implications for Geological Events

Central Fujian Rift is another new and important volcanogenic massive sulfide Pb-Znpolymetallic metailogenetic belt. In order to find out the material genesis and mineralization period ofMeixian-type Pb-Zn-Ag deposits, S and Pb isotope analysis and isotope geochronology of ores and wallrocks for five major deposits are discussed. It is concluded that the composition of sulfur isotope fromsulfide ore vary slightly in different deposits and the mean value is close to zero with the δ34S rangingfrom -3.5‰ to +5.6‰ averaging at +2.0‰, which indicates that the sulfur might originate from magmaor possibly erupted directly from volcano or was leached from ore-hosted volcanic rock. The lead fromores in most deposits displays radioactive genesis character (206Pb/204Pb>18.140, 207Tb/204Pb>15.584,208Pb/204Pb>38.569) and lead isotope values of ores are higher than those of wall rocks, which indicatesthat the lead was likely leached from the ore-hosted volcanic rocks. Based on isotope data, twosignificant Pb-Zn metallogenesis are delineated, which are Mid- and Late-Proterozoic sedimentaryexhalative metallogenesis (The single zircon U-Pb, Sm-Nd isochronal and Ar-Ar dating ages of ore-hosted wall rocks are calculated to be among 933-1788 Ma.) and Yanshanian magmatic hydrothermalsuperimposed and alternated metallogenesis (intrusive SHRIMP zircon U-Pb and Rb-Sr isochronalages between 127-154 Ma).水利论文#Uk0Op"e\

作 者: FENG Chengyou ZHANG Dequan LI Daxin SHE Hongquan DONG Yingjun  
作者单位:Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037 
刊 名:地质学报(英文版)  SCI
英文刊名:ACTA GEOLOGICA SINICA 
年,卷(期):2008 82(4) 
分类号:P5 
关键词:Meixian-type deposit   sulfur and lead isotopes   mineralogetic epoch   metallizing genesis   Central Fujian Rift  
机标关键词:isotope geochronologyvolcanic rockssulfur isotopesingle zirconlead isotopePb isotopemean value 
基金项目:The Geological Survey Program,China Geological Survey 
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