Artículo
Petrogenesis of the Gualcamayo Igneous Complex: Regional implications of Miocene magmatism in the Precordillera over the Pampean flat-slab segment, Argentina
Fecha de publicación:
12/2018
Editorial:
Pergamon-Elsevier Science Ltd
Revista:
Journal of South American Earth Sciences
ISSN:
0895-9811
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The Gualcamayo Igneous Complex is located over the Pampean flat-slab segment (28–33°S), ∼110 km eastward from the Upper Miocene front arc position. It consists of subvolcanic rocks that are affected by porphyry-type hydrothermal alteration, and are genetically linked to a cluster of Carlin-type, skarn and epithermal gold deposits at the Gualcamayo mining district. The petrogenetic analysis of these volcanic rocks allows suggesting that this late Miocene (∼9 Ma) arc-related magmatism with an adakitic signature derives from asthenospheric mantle magmas that under thickened crust conditions, evolved through amphibole fractionation with lower crust melting, probably involving Grenvillian amphibolites from the basement of the Precordillera. These melts evolved towards shallower magma chambers, where they fractionated amphibole and plagioclase, leading to a variable adakitic signal.
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Identificadores
Colecciones
Articulos(IGEBA)
Articulos de INSTITUTO DE GEOCIENCIAS BASICAS, APLICADAS Y AMBIENTALES DE BS. AS
Articulos de INSTITUTO DE GEOCIENCIAS BASICAS, APLICADAS Y AMBIENTALES DE BS. AS
Articulos(INGEOSUR)
Articulos de INST.GEOLOGICO DEL SUR
Articulos de INST.GEOLOGICO DEL SUR
Citación
D'annunzio, María Celeste; Rubinstein, Nora Alicia; Rabbia, Osvaldo Miguel; Petrogenesis of the Gualcamayo Igneous Complex: Regional implications of Miocene magmatism in the Precordillera over the Pampean flat-slab segment, Argentina; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 88; 12-2018; 16-28
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