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  

作　　者：Fariba Padyar Mohammad Rahgoshay Alexander Tarantola Marie-Camille Caumon Seyed Mohammad Pourmoafi 

机构地区：[1]Faculty of Earth Sciences,Shahid Beheshti University-Evin,Tehran,Iran [2]Department of Exploration,Geological Survey of Iran,Tehran,Iran [3]GeoResources Lab、Faculty of Sciences and Technologies,University of Lorraine,CNRS,Vandoeuvre the Nancy F-54506,France

出　　处：《Journal of Earth Science》2020年第3期523-535,共13页地球科学学刊（英文版）

基　　金：supported by the Ministry of Science, Research and Technology of Iran and TRIGGER Program。

摘　　要：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 host-rocks.The 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 3.Stage 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 calcite.Mineralization in Stage 3 occurs as replacement bodies and contains Fe-poor sphalerite without zoning in the outer parts of the deposit.This paper focuses on fluid inclusions in veins bearing sphalerite and quartz.The 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 eq.Sphalerite and fluid inclusions of the Latala base and precious metal deposit formed from relatively low-T and low-salinity solutions.Raman 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 H2.Lack of reduced carbon species(methane and lighter hydrocarbons)was confirmed in the petrographic study using UV light and Raman spectroscopy.High amounts of H2 in fluid inclusions of Fe-poor sphalerite can be the result of different intensities of alteration and diffusion processes.The common occurrences of CO2 in fluid inclusions have originated from magma degassing and dissolution of carbonates.Theδ^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-7.1‰and+0.6‰.These values corresp

关 键 词：Iran Miduk porphyry Latala SPHALERITE fluid inclusions Raman spectroscopy δ^34S 

分 类 号：P611[天文地球—矿床学] P618.5[天文地球—地质学]