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Controls on tellurium in base, precious, and telluride minerals in the panormos Bay Ag-Au-Te deposits, Tinos Island, Cyclades, Greece / Stylianos Tombros in Economic geology, Vol. 105 N° 6 (Septembre/Octobre 2010) 

Public ISBD [article]  in Economic geology > Vol. 105 N° 6 (Septembre/Octobre 2010) . - pp. 1097-1111 Titre : Controls on tellurium in base, precious, and telluride minerals in the panormos Bay Ag-Au-Te deposits, Tinos Island, Cyclades, Greece Type de document : texte imprimé Auteurs : Stylianos Tombros, Auteur ; Karen St. Seymour, Auteur ; Anthony E. Williams-Jones, Auteur Année de publication : 2011 Article en page(s) : pp. 1097-1111 Note générale : Economic Geology Langues : Anglais (eng) Mots-clés : Tellurium  Minerals  Tinos  Island  Greece Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : Tellurium-bearing base metal assemblages dominate the eight stages of mineralization in quartz ± calcite ± adularia ± illite epithermal Au-Ag-Te veins at Panormos Bay, Tinos Island, Cyclades. Tellurium-bearing sulfides and sulfosalts both preceded and followed the main, telluride-forming event (stage V). The complex stage V telluride assemblage was characterized by a sequence of early Ag-, middle Cu-, and late Au-bearing tellurides. There is textural evidence for epitaxial growth of the tellurides. Phase separation of carbon dioxide would have caused H2Te(g) to partition into a gaseous phase and resulted in pH neutralization. Due to rapid up-vapor transport, tellurium-bearing vapors probably supersaturated, condensed as droplets, and were resorbed into the ore-forming solution. These mechanisms enhanced local Te enrichment in the mineralizing liquid, above equilibrium, of ∑Te as H2Te(g) (i.e., log fH2Te(g) values of −0.5 to −1.5), and resulted in epitaxial growth of stage V tellurides. Epitaxy in the Panormos Bay case can be simulated by the Stranski-Krastanov crystal growth model. For supersaturation ratios with S values of 1 and 4, we predict an overall increase of the nucleation rate of tellurium and subsequent telluride precipitation. DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/content/105/6/1097.abstract [article] Controls on tellurium in base, precious, and telluride minerals in the panormos Bay Ag-Au-Te deposits, Tinos Island, Cyclades, Greece [texte imprimé] / Stylianos Tombros, Auteur ; Karen St. Seymour, Auteur ; Anthony E. Williams-Jones, Auteur . - 2011 . - pp. 1097-1111. Economic Geology Langues : Anglais (eng) in Economic geology > Vol. 105 N° 6 (Septembre/Octobre 2010) . - pp. 1097-1111 Mots-clés : Tellurium  Minerals  Tinos  Island  Greece Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : Tellurium-bearing base metal assemblages dominate the eight stages of mineralization in quartz ± calcite ± adularia ± illite epithermal Au-Ag-Te veins at Panormos Bay, Tinos Island, Cyclades. Tellurium-bearing sulfides and sulfosalts both preceded and followed the main, telluride-forming event (stage V). The complex stage V telluride assemblage was characterized by a sequence of early Ag-, middle Cu-, and late Au-bearing tellurides. There is textural evidence for epitaxial growth of the tellurides. Phase separation of carbon dioxide would have caused H2Te(g) to partition into a gaseous phase and resulted in pH neutralization. Due to rapid up-vapor transport, tellurium-bearing vapors probably supersaturated, condensed as droplets, and were resorbed into the ore-forming solution. These mechanisms enhanced local Te enrichment in the mineralizing liquid, above equilibrium, of ∑Te as H2Te(g) (i.e., log fH2Te(g) values of −0.5 to −1.5), and resulted in epitaxial growth of stage V tellurides. Epitaxy in the Panormos Bay case can be simulated by the Stranski-Krastanov crystal growth model. For supersaturation ratios with S values of 1 and 4, we predict an overall increase of the nucleation rate of tellurium and subsequent telluride precipitation. DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/content/105/6/1097.abstract