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Cordieritite and Leucogranite Formation during Emplacement of Highly Peraluminous Magma: the El Pilon Granite Complex (Sierras Pampeanas, Argentina) |
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| Authors: | RAPELA C W; BALDO E G; PANKHURST R J; SAAVEDRA J |
| Institution: | 1CENTRO DE INVESTIGACIONES GEOLÓGICAS, UNIVERSIDAD NACIONAL DE LA PLATA, CALLE 1 NO. 644, 1900 LA PLATA, ARGENTINA 2UNIVERSIDAD NACIONAL DE CÓRDOBA, VELEZ SARSFIELD 299, CÓRDOBA, ARGENTINA 3BRITISH ANTARCTIC SURVEY, c/o NERC ISOTOPE GEOSCIENCES LABORATORY, KINGSLEY DUNHAM CENTRE, KEYWORTH, NOTTINGHAM NG12 5GG, UK 4INSTITUTO DE AGROBIOLOGÍA Y RECURSOS NATURALES, CSIC, CORDEL DE MERINAS 40–52, 38071 SALAMANCA, SPAIN |
| Abstract: | Cordieritites and highly peraluminous granites within the ElPilón granite complex, Sierras Pampeanas, Argentina,were emplaced during a medium-P, high-T metamorphic event duringthe initial decompression of a Cambrian orogen along the southwesternmargin of Gondwana. Very fresh orbicular and massive cordierititebodies with up to 90% cordieritite are genetically associatedwith a cordierite monzogranite pluton and a larger body of porphyriticgranodiorite. The petrogenesis of this association has beenstudied using petrographical, mineralogical, thermobarometric,geochemical, geochronological and isotope methods. The graniticmagmas were formed by anatexis of mid-crustal metamorphic rocksformed earlier in the Pampean orogeny. The cordieritites appearat the top of feeder conduits that connected the source regionlocated at |
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