Fluid mixing as the mechanism of formation of the Dajing Cu-Sn-Ag-Pb-Zn ore deposit,Inner Mongolia |
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| Authors: | Email author" target="_blank">Wei?LiuEmail author Xinjun?Li Jun?Tan |
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| Institution: | 1.Key Laboratory of Mineral Resources, Institute of Geology and Geophysics,Chinese Academy of Sciences,China |
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| 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 δD values of quartz-hosted inclusion water are centered at −100%.– −130%.. The δ34S values of sulfide ore minerals and δ13
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 H2O versus CO2 plot, and plots of CO, N2, CH4, and C2H6. 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 CO2-rich magmatic fluid with meteoric-derived groundwater. The groundwater circulated in Paleozoic sedimentary rocks and absorbed
CO, N2, CH4, C2H6 and radiogenic Ar from organic matter. Cooling effects resulting from mixing have caused the precipitation of ore minerals. |
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