Greisen deposits associated to carboniferous post-orogenic granites with mineralization potencial. Sierra de Fiambaĺ, Catamarca, Argentina
The Fiambaĺ range is located in the central - south part of the province of Catamarca, Western Sierras Pampeanas, Argentina. It is largely conformed by Precambrian metamorphic rocks, a Cambrian granitic intrusive, Ordovician basic and ultrabasic rocks and epizonalCarboniferous granites (Los Ratones,...
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| Autores principales: | , , , |
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| Formato: | JOUR |
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_03660176_v119_n4_p509_Fogliata |
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| Sumario: | The Fiambaĺ range is located in the central - south part of the province of Catamarca, Western Sierras Pampeanas, Argentina. It is largely conformed by Precambrian metamorphic rocks, a Cambrian granitic intrusive, Ordovician basic and ultrabasic rocks and epizonalCarboniferous granites (Los Ratones, El Salto and Ayacucho Granites). The Carboniferous granites are subalkaline, weakly peraluminous,high silica (except for the porphyritic fades of Los Ratones granite) and moderately enriched in K. Contents of trace lements and REE indicate that El Salto and Ayacucho granites and the granular fades of Los Ratones granite have characteristics of evolved and differentiated granite associated with hydrothermal systems. The variations of trace elements, particularly Sn, W, U, Rb, Ba, Zr and Sr suggest that they correspond to granites with mineralization potential. Genetically linked to these granites there are Sn, W, U and minor base metals greisen deposits. The hydrothermal process that yield to these deposits involved two main alteration stages, beginning with alkali meta somatism follow by greissenization. According to the isotopic ages the hydrothermal processes postdate about 1 Ma the magmatic activity. The analyses of the granites and the associated greisen deposits confirm that the post - orogenic carboniferous magmatism is the major metallogenetic control of the ore deposits from the studied area. This metallogenetic control could be a useful! tool in prospecting similar deposits in the rest of the Western Sierras Pampeanas. |
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