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

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

China: Implications for Geological Events

FENG Chengyou; ZHANG Dequan; LI Daxin; SHE Hongquan; DONG Yingjun

【期刊名称】《《地质学报（英文版）》》 【年(卷),期】2008(082)004

【摘要】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