Metamorfismo de baja presión, su relación con el desarrollo de la Cuenca Puncoviscana, plutonismo y régimen tectónico. Argentina
DOI:
https://doi.org/10.3989/egeol.92485-6394Keywords:
Cordillera Oriental Argentina, crustal extension, basic-alkalic lavas, low-pressure/high temperature metamorphismAbstract
In the Cordillera Oriental Argentina (22 and 26° S), the Puncoviscana Formation Basin was developed, in which an extensional tectonic setting would had been supported from Upper Precambrian to Middle Ordovician. That is suggested by the limited crustal thickening, the insignificant uplift after deformation, the sedimentary-synchronous basic-alkalic lavas and the growth of a low-pressure high-temperature metamorphism that culminates in anatectic migmatites, which have no explanation by the only magmatic heat derived from the little trondhjemite-granodiorite diapires intruded during the Middle Ordovician.
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