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• W2077114323 abstract "Epizonal igneous and metamorphic rocks in northwestern Argentina are exposed in the Sierra de Paiman. The metamorphic rocks are quartzites, phyllites, and slates with soft-body impressions and fossil traces that suggest a late Precambrian-Cambrian age. The igneous rocks were intruded during two major magmatic events according to KAr and RbSr data. The older event is represented by different kinds of granitoids and gabbroids, intruded 437–459 Ma. These rocks were emplaced syntectonically in a shear zone that remained active after emplacement, causing extensive mylonitization on the east side of the range. The granitoids show Sr isotopic disturbances possibly related to magma mixing events. Petrologic, geochemical, and isotopic data for these rocks suggest a volcanic-arc setting, probably related to the back arc of the eastward-dipping continental arc of the Famatina Belt. During the younger event (ca. 379 Ma) stocks and dikes of leucogranites were emplaced post-tectonically with respect to the last episode of mylonitization. The leucogranites have syn-collisional signatures and may thus represent the culmination of the volcanic arc of the Famatina Belt. En la Sierra de Paimán, ubicada en el noroeste de Argentina, afloran rocas ígneas epizonales y metamorfitas. Las rocas metamórficas consisten en metasamitas, filitas y pizarras con impresiones de cuerpos blandos y trazas fósiles que sugieren una edad de depositación Precámbrica superior-Cámbrica inferior. Los análisis isotópicos KAr y RbSr indican que las rocas ígneas fueron intruidas durante dos eventos magmáticos principales. El más antiguo está representado por granitoides y gabroides emplazados entre los 437–459 Ma. Estas rocas se intruyeron sintectónicamente en una área de cizalla que permaneció activa después de su cristalización generando diversas fajas miloníticas, principalmente en el flanco este de la sierra. Los granitos Ordovícicos muestran perturbaciones en el sistema isotópico de Sr que podrían estar relacionadas a procesos de mezcla de magmas. La información geoquímica, petrológica e isotópica de estas rocas sugiere un ambiente de arco magmático, probablemente relacionado al arco magmático continental con vergencia hacia el este del Sistema de Famatina. El evento magmático más joven está integrado por stocks y diques de leucogranito emplazados tardío tectónicamente (ca. 379 Ma) con respecto al último evento milonítico. Estos leucogranitos presentan filiación de granitos colisionales lo que sugiere que representarían la culminación del arco magmático del Sistema de Famatina." @default.
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• W2077114323 date "1992-04-01" @default.
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• W2077114323 title "KAr and RbSr geochronology og igneous rocks from the Sierra de Paiman, northwestern Argentina" @default.
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• W2077114323 doi "https://doi.org/10.1016/0895-9811(92)90024-s" @default.
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