Distribution of In and other rare metals in cassiterite and associated minerals in Sn ± W ore deposits of the western Variscan Belt

Abstract : We present data available on rare metal and indium distributions in cassiterite and associated minerals from thirteen Sn ± W granite-related ore deposits in the western Variscan Belt (Massif Central and Armorican Massif, France; Galicia, Spain; and SW England). Cassiterite and associated minerals including sulfides and titanium oxides were analysed using an electron probe micro-analyzer (EPMA). Significant indium contents were only measured in cassiterite from hydrothermal vein-type mineralizations associated with peraluminous granites of Montbelleux, Abbaretz (French Armorican Massif) and Marcofán (Galicia); they correlate with the highest Nb, Ta and Fe substitutions. Two coupled substitutions are proposed: (1) 2 (Sn4+, Ti4+)↔(Fe3+, In3+) + (Nb5+, Ta5+) and (2) Fe2+ + (Nb, Ta)5+↔In3++(Ti, Sn)4+ depending on Fe valence state. Sulfides (stannite, chalcopyrite, pyrite, arsenopyrite and sphalerite) and rutile associated with cassiterite contain significant amounts of indium, even when cassiterite is indium-free, suggesting preferential partitioning into the sulfides.
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Catherine Lerouge, Eric Gloaguen, Guillaume Wille, Laurent Bailly. Distribution of In and other rare metals in cassiterite and associated minerals in Sn ± W ore deposits of the western Variscan Belt. European Journal of Mineralogy, E Schweizerbart Science Publishers, 2017, 29 (4), pp.739 - 753. ⟨10.1127/ejm/2017/0029-2673⟩. ⟨insu-01555328v2⟩

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