Fluid Inclusion Evidences for the P-T Conditions of Quartz Veins Formation in the Black Shale-Hosted Gold Deposits, Bodaybo Ore Region, Russia  

作　　者：Natalia N.Ankusheva Ekaterina E.Palenova Svetlana N.Shanina 

机构地区：[1]Institute of Mineralogy,South-Urals Federal Research Center of Mineralogy and Geoecology,Urals Branch,Russian Academy of Sciences,Miass 456317,Russia [2]Geological Department,South-Urals State University,Miass 456300,Russia [3]Institute of Geology of the Komi Science Center,Urals Branch,Russian Academy of Sciences,Syktyvkar 167982,Russia

出　　处：《Journal of Earth Science》2020年第3期514-522,共9页地球科学学刊（英文版）

基　　金：the State Contract of the Institute of Mineralogy,South-Urals Federal Research Center of Mineralogy and Geoecology,Urals Branch,Russian Academy of Sciences(Project for 2019-2021);the Basic Research Foundation of Russia(No.16-05-00580).

摘　　要：The P-T conditions of auriferous and barren quartz veins from Kopylovsky,Kavkaz and Krasnoye gold deposits in Proterozoic black shales of Bodaybo ore region are presented the first time in this study.Fluid inclusions trapped in auriferous quartz are aqueous Na±K-Mg chloride with salinity of 6 wt.%-8.8 wt.%NaCleqv.Homogenization temperatures vary from 260 to 350℃,and calculated trapping pressures are 1.2-1.6 kbar.The fluids trapped in barren quartz have more complicated compositions with Na,K,Mg and Fe chlorides,salinity up to 13 wt.%NaCleqv,and homogenization temperatures ranging between 140 and 280℃.The volatiles in fluids are dominated by H2O,followed by CO2 with minor amounts of CH4 and N2.We suppose that auriferous and barren quartz veins have been formed due to the basic metamorphogenic fluid as evidenced by the close slat and gas fluid composition.

关 键 词：Bodaybo black shales gold deposits gold-bearing quartz barren veins fluid inclusions P-T conditions 

分 类 号：P618.51[天文地球—矿床学]