The study results of He and Ar isotopes from fluid inclusions in pyrites formed during mineralization stage of Jinding superlarge Pb-Zn deposit in west Yunnan, China are reported. The data show that the 40Ar/ 36Ar and...The study results of He and Ar isotopes from fluid inclusions in pyrites formed during mineralization stage of Jinding superlarge Pb-Zn deposit in west Yunnan, China are reported. The data show that the 40Ar/ 36Ar and 3He/ 4He ratios of fluid inclusions are respectively in the range of 301.7\385.7 and 0.03\0.06Ra, suggesting the ore-forming fluid is a kind of air saturated meteoric groundwater. On the basis of research on coupled relationships among He, Ar, S and Pb isotopes, the evolution history of ore-forming fluid of the deposit can be summarized as （i） air saturated meteogenic groundwater infiltrated down and was heated→ （ii） leached S, C and radiogenic He, Ar from the basinal strata → （iii） leached Pb and Zn from mantle-derived igneous rocks located in the bottom of the basin→ （iv） ore-forming fluid ascended and formed the deposit. Due to this process, the isotope signatures of crustal radiogenic He, atmospheric Ar （with partial radiogenic 40Ar）, crustal S and mantle-derived Pb remained in the ore-forming fluid.展开更多
文摘The study results of He and Ar isotopes from fluid inclusions in pyrites formed during mineralization stage of Jinding superlarge Pb-Zn deposit in west Yunnan, China are reported. The data show that the 40Ar/ 36Ar and 3He/ 4He ratios of fluid inclusions are respectively in the range of 301.7\385.7 and 0.03\0.06Ra, suggesting the ore-forming fluid is a kind of air saturated meteoric groundwater. On the basis of research on coupled relationships among He, Ar, S and Pb isotopes, the evolution history of ore-forming fluid of the deposit can be summarized as （i） air saturated meteogenic groundwater infiltrated down and was heated→ （ii） leached S, C and radiogenic He, Ar from the basinal strata → （iii） leached Pb and Zn from mantle-derived igneous rocks located in the bottom of the basin→ （iv） ore-forming fluid ascended and formed the deposit. Due to this process, the isotope signatures of crustal radiogenic He, atmospheric Ar （with partial radiogenic 40Ar）, crustal S and mantle-derived Pb remained in the ore-forming fluid.
