Isotope geochemistry of the Yindongpo gold deposit, Tongbai county, Henan province, China

银洞坡金矿床位于河南肖桐柏地区围山城金银多金属矿带内,矿体定位受新元古界歪头山组地层控制。各成矿阶段热液石英中流体的δ~(18)O_w值为0.0‰～10.8‰,晚期碳酸盐中流体的δ~(18)O_W 值为-5.3‰～-9.7‰,流体的δD值为-65‰～-84‰,显示早阶段成矿流体以来自赋矿地层的变质水为主,晚阶段大气降水不断混入。包裹体的δ~(13)C_(CO)_2值介于-3.7‰～+6.7‰,指示流体的碳主体来自碳酸盐储库。硫化物的δ~(34)S 值介于+1.3‰～+3.1‰,具塔式分布特征,硫主要源自围岩歪头山组。~(206)Pb/~(204)Pb=16.540～17.216,~(207)P...The Yindongpo gold deposit is located in the Weishancheng Au-Ag-dominated poly-metallic ore belt in the Tongbai Mountains, Henan province. The occurrences of ore bodies are controlled by the ore-hosted strata, i.e. the Neoproterozoic Waitoushan Formation. The delta D values of the fluid inclusions within quartz separates from different paragenerations are between -65 parts per thousand and -84 parts per thousand, with corresponding delta O-18(W) values of 0.0 parts per thousand to 10.8 parts per thousand. The delta O-18(W) values of the fluid within late-stage carbonate range from -5.3 parts per thousand to -9.7 parts per thousand. This indicates that the ore-fluid system was of metamorphic from the ore-hosted strata in early-stage and of meteoric in late-stage. The delta C-13(CO2) values of fluid inclusions vary between -3.7 parts per thousand and +6.7 parts per thousand, suggesting that the carbon in fluid was likely derived from metamorphic decabonization of carbonate strata. The delta S-34 values of sulfides are + 1.3 parts per thousand similar to + 3.1 parts per thousand and the sulfur may have derived from the Waitoushan Formation. The sulfides have a uniform Pb isotope composition, with Pb-206/Pb-204 = 16.540 similar to 17.216, Pb-207/Pb-204 = 15.056 similar to 15.612 and Pb-208/Pb-204 = 37.336 similar to 38.861. The to values of ore lead vary from 39.50 to 48.62, indicating that the ore-lead source was highly maturized. The ores have similar lead isotope ratios with the Waitoushan Formation but constrasting lead isotope ratios with the other tectonolithologic units of the Qinling Orogen, which strongly suggests that the ore metals were mainly sourced from the Waitoushan Formation. Therefore, the Yindongpo gold deposit is a typical stratabound orogenic-type gold deposit in terms of both its ore-forming fluid and metal source and its geologic characteristics. The ore-forming process took place during continental collision between the Yangtze Block and North China Block.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000242107500016&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701SCI(E)中文核心期刊要目总览(PKU)中国科技核心期刊(ISTIC)中国科学引文数据库(CSCD)14102551-25602