Abstract
Dajing Cu-Sn-Ag-Pb-Zn ore deposit, in the Inner Mongolia Autonomous Region of China, is a fissure-filling hydrothermal ore deposit. The δ D values of quartz-hosted inclusion water are centered at −100‰ — −130‰. The δ 34 S values of sulfide ore minerals and δ 13 C values of carbonate gangue minerals vary from −0.3‰ to 2.6‰ and from −2.9‰ to −7.0‰, respectively. Integrated isotopic data point to two major contributions to the mineralizing fluid that include a dominant meteoric-derived groundwater, and sulfur and carbon species from hypogene magma. Linear trends are exhibited on the gaseous H 2 O versus CO 2 plot, and plots of CO, N 2 , CH 4 , and C 2 H 6 . It is shown by quantitative simulation that magma degassing cannot explain the linear trends. Hence, these linear trends are interpreted in terms of mixing of CO 2 -rich magmatic fluid with meteoric-derived groundwater. The groundwater circulated in Paleozoic sedimentary rocks and absorbed CO, N 2 , CH 4 , C 2 H 6 and radiogenic Ar from organic matter. Cooling effects resulting from mixing have caused the precipitation of ore minerals.
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