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Condiciones físicas del metamorfismo de alta temperatura y baja presión del basamento paleozoico inferior en el área de San Martín de los Andes, Neuquén

Authors: Serra Varela, Samanta; Gonzalez, Pablo Diego; Giacosa, Raul Eduardo; Heredia, Nemesio; Sato, Ana Maria;

Condiciones físicas del metamorfismo de alta temperatura y baja presión del basamento paleozoico inferior en el área de San Martín de los Andes, Neuquén

Abstract

El basamento metamórfico de la zona de San Martín de los Andes incluye esquistos, gneises y migmatitas que se encuentran intruidos por granitoides devónicos que cortan las estructuras de dichas rocas. Se trata de un basa- mento relacionado con un ciclo pre-Gondwanico del que se desconoce su extensión regional en los Andes Nordpa- tagónicos. Análisis petrográficos y de pseudosecciones PT nos permitieron determinar parámetros físicos para ca- racterizar las condiciones del metamorfismo. Las migmatitas se encontrarían en una serie de baja presión y alta temperatura (LP-HT), en la transición entre las facies anfibolita y granulita. Considerando las características del metamorfismo y su edad (pre-Devónico), no se han encontrado rocas equivalentes a las de San Martín de los Andes en áreas cordilleranas aledañas con afloramientos de basamento pre-andino.

Metamorphic rocks from San Martin de Los area comprise schists, gneises and migmatites. These rocks are intruded by Devonian granitoids that cut the metamorphic internal structure of these rocks. These rocks belong to a pre-Gondwanan cycle and its regional extension in the Norpatagonian Andes is unknown. Petrographic analysis and PT pseudosections allowed us to determine physical parameters in order to characterize the metamophic conditions. Migmatic rocks would be part of a low pressure-hightemperature series (LP-HT) in the transition between amphibolite and granulite facies. COnsidering its metamorphic characteristics and age (pre-Devonian), no equivalent rocks have yet been found in nearby areas with outcrops of pte-Andean basement.

Fil: Sato, Ana Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina

Fil: Serra Varela, Samanta. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigación en Paleobiología y Geología; Argentina

Fil: Gonzalez, Pablo Diego. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigación en Paleobiología y Geología; Argentina

Fil: Giacosa, Raul Eduardo. Servicio Geológico Minero Argentino. Delegación General Roca; Argentina

Fil: Heredia, Nemesio. Instituto Geológico y Minero de España; España

XX Congreso Geologico Argentino

Asociación Geológica Argentina

San Miguel de Tucuman

Countries
Argentina, Spain
Keywords

https://purl.org/becyt/ford/1.5, ANDES NORPATAGONICOS, METAMORFISMO LP-HT, metamorfismo LP-HT, migmatitas, Andes Norpatagónicos, https://purl.org/becyt/ford/1, MIGMATITAS

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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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impulse
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