Artículo
Possible sources for monogenetic Pliocene–Quaternary basaltic volcanism in northern Patagonia
Massaferro, Gabriela Isabel
; Haller, Miguel Jorge F.
; Dostal, Jarda; Pécskay, Zoltán; Prez, Horacio; Meister, Carlos Miguel Ramón
; Alric, Viviana Ines
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Fecha de publicación:
07/2014
Editorial:
Elsevier
Revista:
Journal of South American Earth Sciences
ISSN:
0895-9811
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The Pliocene- Quaternary times in Extra-Andean Patagonia are characterized by the effusion of intraplate basalts. This work is focused on those basalts outcropping between 40° and 46°S. The age of this volcanism varies between 0.23 and 5 Ma. Based on the general geochemical characteristics, geographic distribution, and structural framework of the region, we propose that the basalts originated in response to the back arc extension that caused the thinning, doming and fracturing of the lithosphere, and extrusion of mafic magmas with a relatively primitive nature and OIB-like compositions. The geochemical characteristics allow to distinguish three types of basalts: basanites, alkaline basalts and tholeiitic basalts, each one representing different sources and percentages of partial melt and implying a heterogeneous source. A source with these characteristics could be the lithospheric mantle.
Palabras clave:
Basaltic Volcanism
,
Patagonia
,
Petrology
,
Quaternary
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Colecciones
Articulos(CCT-CENPAT)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CENPAT
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CENPAT
Citación
Massaferro, Gabriela Isabel; Haller, Miguel Jorge F.; Dostal, Jarda; Pécskay, Zoltán; Prez, Horacio; et al.; Possible sources for monogenetic Pliocene–Quaternary basaltic volcanism in northern Patagonia; Elsevier; Journal of South American Earth Sciences; 55; 7-2014; 29-42
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