Chovan M., Mikuš T., Prcúch J. & Bača B., 2021: Assemblage of Ag–Pb–Bi±Cu sulfosalts from the Bieber vein, Banská Štiavnica deposit, Slovakia. Acta Geologica Slovaca, 13, 2, 191–198.


Assemblage of Ag–Pb–Bi±Cu sulfosalts from the Bieber vein, Banská Štiavnica deposit, Slovakia

Martin Chovan1, Tomáš Mikuš2, Ján Prcúch3 & Boris Bača3

1Department of Mineralogy, Petrology and Economic Geology, Faculty of Natural Sciences, Comenius University, Ilkovičova 6, 842 15 Bratislava, Slovak Republic; chovanmmm@gmail.com
2Earth Science Institute, Slovak Academy of Sciences, Ďumbierska 1, 974 01 Banská Bystrica, Slovakia
3Slovenská Banská, Ltd., 966 61 Hodruša-Hámre 388, Slovakia

Abstract

An interesting assemblage of Ag-Pb-Bi±Cu-sulfosalts was found at the Bieber vein in Banská Štiavnica. Their occurrence is related to the deepest part of the vein, characterized by a high copper content and the predominance of chalcopyrite over other base metals sulfides. Rare members of lillianite series (ourayite, eskimoite and “schirmerite”) are associated with schapbachite and matildite – galena exsolutions. Berryite, arcubisite and acanthite, polybasite and unnamed phase (Cu3AgPbBi2S6) were also rarely found as inclusions in galena. Bi sulfosalts of the lillianite homologous series (ourayite, eskimoite, “schirmerite”) and schapbachite probably formed at temperatures around 350 °C. When the temperature was reduced below 215 °C, the sulfosalts were unstable and below 144 °C the solid solution exsolved to pure AgBiS2 and PbS.


Key words: Western Carpathians, sulfosalts, lillianite homologous series, eskimoite, ourayite, “schirmerite”, matildite-galena exsolution


Manuscript received: 2021-01-22

Revised version accepted: 2021-11-22


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