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High fH2-fS2 Conditions Associated with Sphalerite in latala Epithermal Base and Precious Metal Deposit, Central Iran: Implications for the Composition and Genesis Conditions of Sphalerite

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Journal of Earth Science 2020年第3期31卷 523-535页

作者： Fariba Padyar Mohammad Rahgoshay Alexander Tarantola Marie-Camille Caumon Seyed Mohammad Pourmoafi Faculty of Earth Sciences Shahid Beheshti University-EvinTehranIran Department of Exploration Geological Survey of IranTehranIran GeoResources Lab、Faculty of Sciences and Technologies University of LorraineCNRSVandoeuvre the Nancy F-54506France

This paper presents the properties of fluid inclusions found in sphalerite from latala epithermal base and precious metal deposit(Central Iran),which is hosted in Cenozoic volcanicsedimentary *** latala Deposit represents an example of vein type,base metal deposits in the Miduk porphyry copper deposits(PCDs)in southern Urumieh-Dokhtar magmatic belt(UDMB).Mineralization in latala epithermal base and precious metal vein type formed in 3 stages and sphalerite-quartz veins occur in stages 2 and *** 2 quartz-sphalerite veins are associated with chalcopyrite and zoned sphalerite,along with quartz+hematite,and Stage 3 quartz-sphalerite veins contain galena+sphalerite+chalcopyrite and quartz with overgrowth of *** in Stage 3 occurs as replacement bodies and contains Fe-poor sphalerite without zoning in the outer parts of the *** paper focuses on fluid inclusions in veins bearing sphalerite and *** fluid inclusion homogenization temperatures and salinity in sphalerite(some with typical zoning)range from 144 to 285℃and from 0.2 wt.%to 7.6 wt.%NaCl *** and fluid inclusions of the latala base and precious metal deposit formed from relatively low-T and low-salinity *** spectroscopy analyses indicate a high percentage of CO2 in the gas phase of fluid inclusions in Fe-poor sphalerites,as expected with melting temperature for CO2 of-56.6℃,and significant amounts of *** of reduced carbon species(methane and lighter hydrocarbons)was confirmed in the petrographic study using UV light and Raman *** amounts of H2 in fluid inclusions of Fe-poor sphalerite can be the result of different intensities of alteration and diffusion *** common occurrences of CO2 in fluid inclusions have originated from magma degassing and dissolution of ***δ^34S values for sulfide minerals in galena of sphalerite bearing veins vary between-9.8‰and-1.0‰,and theδ^34S values calculated for H2 S are between

关键词： Iran Miduk porphyry latala sphalerite fluid inclusions Raman spectroscopy δ^34S

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