Distribution of indium in the Animas - Chocaya - Siete Suyos District

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Martinez, Malena Cazorla
Tarres, Marta
Gemmrich, Laura
Torres, Belen
Artiaga, David
Martinez, Alvaro
Mollinedo, Diva
Caries Melgarejo, Joan
Torro, Lisard
Arce, Osvado
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Society of Geology Applied to Mineral Deposits
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The Ánimas-Chocaya-Siete Suyos district in SW Bolivia hosts a Bolivian-type polymetallic vein mineralization composed mostly of cassiterite, sphalerite, pyrite, galena, stannite, lead sulfosalts, tin sulfosalts and silver sulfosalts. In addition to base (Zn, Sn, Pb) and precious (Ag) metals, important concentrations of In have been described. Systematic EPMA analyses have revealed that the highest concentrations are found in an early generation of sphalerite (up to 9.66 wt% In) and in stannite (up to 4.11 wt% In). Although In-bearing sphalerites are relatively Fe-rich (mostly between 6.0 and 18.1 mol % FeS), the atomic concentrations of these two elements do not yield any correlation. In contrast, In is positively correlated with Cu mostly along a Cu/In = 1 proportion pointing to a (In 3+ + Cu +) -> 2Zn 2+ coupled substitution. A relatively high activity of Cu during the crystallization of In-rich sphalerite is also supported by exsolutions of chalcopyrite and stannite.
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Sphalerite, Indium, Indium, Andes