This paper presents gas compositions and H-, O-isotope compositions of sulfide- and quartz-hosted fluid inclusions, and S-, Pb-isotope compositions of sulfide separates collected from the principal Stage 2 ores in Vei...This paper presents gas compositions and H-, O-isotope compositions of sulfide- and quartz-hosted fluid inclusions, and S-, Pb-isotope compositions of sulfide separates collected from the principal Stage 2 ores in Veins 3 and 210 of the Jinwozi lode gold deposit, eastern Tianshan Mountains of China. Fluid inclusions trapped in quartz and sphalerite are dominantly primary. H- and O-isotopic compositions of pyrite-hosted fluid inclusions indicate two major contributions to the ore-forming fluid that include the degassed magma and the meteoric-derived but rock 18O-buffered groundwater. However, H- and O-isotopic compositions of quartz-hosted fluid inclusions essentially suggest the presence of groundwater. Sulfide-hosted fluid inclusions show considerably higher abundances of gaseous species CO2, N2, H2S, etc. Than quartz-hosted ones. The linear trends among inclusion gaseous species reflect the mixing tendency between the gas-rich magmatic fluid and the groundwater. The relative enrichment of gaseous species in sulfide-hosted fluid inclusions, coupled with the banded ore structure indicating alternate precipitation of quartz with sulfide minerals, suggests that the magmatic fluid has been inputted to the ore-forming fluid in pulsation. Sulfur and lead isotope compositions of pyrite and galena separates indicate an essential magma derivation for sulfur but the multiple sources for metallic materials from the mantle to the bulk crust.展开更多
The crust in northern Xinjiang intensely moved about during the Middle Hercynian, which formed a large area of granitoid. In the south of Alataw Mountain, granitic bodies such as Kongwusayi, Wulasitan, Zuluhong, Kazib...The crust in northern Xinjiang intensely moved about during the Middle Hercynian, which formed a large area of granitoid. In the south of Alataw Mountain, granitic bodies such as Kongwusayi, Wulasitan, Zuluhong, Kazibieke and Chaganhundi are distributed along the Bole W-Sn mineralization belt from east to west, of which the Zuluhong, Kazibieke and Chaganhundi granitic bodies in the west sector are directly related to W-Sn mineralizations of quartz vein type, greisen type and chlorite type in this area.展开更多
文摘This paper presents gas compositions and H-, O-isotope compositions of sulfide- and quartz-hosted fluid inclusions, and S-, Pb-isotope compositions of sulfide separates collected from the principal Stage 2 ores in Veins 3 and 210 of the Jinwozi lode gold deposit, eastern Tianshan Mountains of China. Fluid inclusions trapped in quartz and sphalerite are dominantly primary. H- and O-isotopic compositions of pyrite-hosted fluid inclusions indicate two major contributions to the ore-forming fluid that include the degassed magma and the meteoric-derived but rock 18O-buffered groundwater. However, H- and O-isotopic compositions of quartz-hosted fluid inclusions essentially suggest the presence of groundwater. Sulfide-hosted fluid inclusions show considerably higher abundances of gaseous species CO2, N2, H2S, etc. Than quartz-hosted ones. The linear trends among inclusion gaseous species reflect the mixing tendency between the gas-rich magmatic fluid and the groundwater. The relative enrichment of gaseous species in sulfide-hosted fluid inclusions, coupled with the banded ore structure indicating alternate precipitation of quartz with sulfide minerals, suggests that the magmatic fluid has been inputted to the ore-forming fluid in pulsation. Sulfur and lead isotope compositions of pyrite and galena separates indicate an essential magma derivation for sulfur but the multiple sources for metallic materials from the mantle to the bulk crust.
基金Project supported by Youth Science Foundation of the University of Science and Technology of China
文摘The crust in northern Xinjiang intensely moved about during the Middle Hercynian, which formed a large area of granitoid. In the south of Alataw Mountain, granitic bodies such as Kongwusayi, Wulasitan, Zuluhong, Kazibieke and Chaganhundi are distributed along the Bole W-Sn mineralization belt from east to west, of which the Zuluhong, Kazibieke and Chaganhundi granitic bodies in the west sector are directly related to W-Sn mineralizations of quartz vein type, greisen type and chlorite type in this area.
