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Titre :
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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 (2011)
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Auteurs :
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Stylianos Tombros, Auteur ;
Karen St. Seymour, Auteur ;
Anthony E. Williams-Jones, Auteur
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Type de document :
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Article : texte imprimé
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Dans :
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Economic geology (Vol. 105 N° 6, Septembre/Octobre 2010)
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Article en page(s) :
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pp. 1097-1111
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Note générale :
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Economic Geology
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Langues :
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Anglais
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Index. décimale :
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553 (Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais)
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Tags :
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Tellurium Minerals Tinos Island Greece
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Résumé :
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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.
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DEWEY :
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553
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ISSN :
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0361-0128
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En ligne :
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http://econgeol.geoscienceworld.org/content/105/6/1097.abstract
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