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Los granitos Río Rodeo y Quimivil: dos etapas del magmatismo paleozoico del norte de Sierras Pampeanas.

Authors: Lazarte, J. E.; Fernandez-Turiel, J. L.; Guidi, Federica; Medina, M.E.;

Los granitos Río Rodeo y Quimivil: dos etapas del magmatismo paleozoico del norte de Sierras Pampeanas.

Abstract

[ES] Tres tipos de granitoides surgen en el norte de la Sierra de Zapata, al sur de Cordón de los Colorados y al suroeste de la Sierra de Belén, provincia de Catamarca, en el noroeste de las Sierras Pampeanas. El granito de Belén es un granito biotítico de grano grueso del Paleozoico inferior con facies deformadas y no deformadas. El granito de Río Rodeo es un granito de dos micas peraluminoso de grano medio a grueso que tuvo un posible origen anatéctico por fusión parcial y cristalización fraccionada del granito de Belén. El tercer plutón, el Granito de Quimivil, tiene cuatro facies principales de sieno- y monzogranitos mayormente biotíticos, de geoquímica peraluminosa y con una tendencia peralcalina. Una fase volátil jugó un papel importante al influir y retrasar la cristalización de feldespatos ricos en álcalis. Hay enriquecimiento de Rb, U, Th y Tierras Raras, y el granito de Quimivil fue responsable de la mineralización que contiene Sn y W. El Granito de Río Rodeo tiene características de sin- a tardi-colisión y el granito de Quimivil tiene características de post-colisión; ambos emplazados bajo 3 kbar y 700 °C. Edades Ordovícico-Silúrico y Carbonífero se infieren para estos granitos.

[EN] Three types of granitoids crop out in the north of Sierra de Zapata, south of Cordón de los Colorados and south-west of Sierra de Belén, Catamarca province, north-western Sierras Pampeanas. The Belén Granite is a Lower Palaeozoic coarse-grained biotitic granite with both deformed and undeformed facies. The Río Rodeo Granite is a medium to coarse-grained peraluminous two-mica granite that had a possible anatectic origin by partial melting and fractional crystallization of the Belén Granite. The third pluton, the Quimivil Granite, has four major facies of mainly biotitic syeno- and monzogranites, of peraluminous geochemistry and with a peralkaline trend. A volatile phase played an important role in influencing and delaying the crystallisation of alkali-rich feldspars. There is Rb, U, Th, and REE enrichment, and the Quimivil Granite was responsible for Sn- and W-bearing mineralization. The Río Rodeo Granite has syn- to late-collision features and the Quimivil Granite has post-collision features; both emplaced under 3 kbar and 700 °C. Ordovician-Silurian and Carboniferous ages are inferred for the respective bodies.

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Keywords

Pampean Ranges, fractional crystallisation, mineralización de Sn-W, magmatism, granito, Cristalización fraccionada, magmatismo, Sn-W mineralization, Sierras Pampeanas, granite

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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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