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TitreIndium associated with sphalerite in the Pomeroy Deposit, New Brunswick
AuteurGoeddeke, C R; Samson, I M; Chapman, J
SourceNew Brunswick Exploration, Mining and Petroleum conference program and abstracts volume; 2014 p. 50
LiensOnline - En ligne
Séries alt.Secteur des sciences de la Terre, Contribution externe 20130534
Éditeurtment of Mines and Energy New Brunswick
RéunionNew Brunswick Exploration, Mining and Petroleum Conference 2014; Fredericton; CA; Novembre 2-4, 2014
Mediaen ligne; numérique
Lat/Long OENS-67.0000 -66.5000 45.5000 45.2500
Sujetsindium; sphalérite; minéralisation; gîtes minéralogiques; géologie économique
ProgrammeInitiative géoscientifique ciblée (IGC-4)
Résumé(disponible en anglais seulement)
Indium is an important metal for technologies such as touch screens, superconductors and solar panels. Indium has largely been recovered as a byproduct of the processing of zinc ores, and to a lesser extent, from ores of lead and tin, making indium important in adding value to ores of these metals. Indium principally occurs as a trace component in sphalerite, although indium minerals such as roquesite (CuInS2) and sakuraiite ((Cu,Fe,Zn)3(In,Sn)S4) have been described from a variety of deposits (Schwatz-Schampera and Herzig, 2002). A solid solution has been proposed between both roquesite and sphalerite (Cook et al., 2009) and sakuraiite and sphalerite (Murao et al., 2008). It has been proposed that indium can either be incorporated into sphalerite during initial precipitation or through secondary alteration during interaction with copper-rich, high temperature (200-400°C) fluids, the latter being associated with the development of chalcopyrite disease. The Pomeroy occurrence in southwestern New Brunswick is located about 10 km west-southwest of the indium-rich Mount Pleasant deposit, in which indium is mainly associated with sphalerite, although roquesite has been reported (Sinclair et al., 2006). Pomeroy is associated with the Pleasant Ridge granite and contains sulphide-rich intersections (characterized by arsenopyrite, cassiterite, chalcopyrite, galena, hematite, magnetite, pyrite, and sphalerite) containing up to ~ 15% Zn and 1% Sn. At Pomeroy, an indium-rich phase that is interpreted as sakuraiite has been observed as exsolution lamellae in sphalerite that exhibits chalcopyrite disease. The sakuraiite(?) lamellae are restricted to the centres of sphalerite crystals, suggesting that the initial stages of sphalerite crystallization incorporated significant indium and copper, which were subsequently exsolved as sakuraiite(?). The outer parts of the sphalerite crystals incorporated less copper and indium, presumably reflecting a decrease in the copper and indium concentrations in the fluid as a result of changes at source, or locally due to the incorporation of these elements into early-formed sphalerite. Regardless, these observations demonstrate that late addition of indium (and copper) to sphalerite is not a viable model for this assemblage at Pomeroy.