IGEBA 23946
INSTITUTO DE GEOCIENCIAS BASICAS, APLICADAS Y AMBIENTALES DE BUENOS AIRES
Unidad Ejecutora - UE
artículos
Título:
The volcanic association of Las Lomadas area, Corona Chico Volcanites. Somún Curá Magmatism. Río Negro province, Argentina
Autor/es:
CERREDO, MARIA ELENA; REMESAL, MARCELA BEATRIZ; ALBITE, JUAN MANUEL; CORDENONS, PABLO DAMIÁN
Revista:
Revista del Museo Argentino de Ciencias Naturales nueva serie
Editorial:
Museo Argentino de Ciencias Naturales
Referencias:
Lugar: Buenos Aires; Año: 2019 vol. 21 p. 179 - 194
ISSN:
1514-5158
Resumen:
This contribution deals with the Corona Chico Vulcanites, within the Somún Curá Magmatic Province, northern Extra-Andean Patagonia. The studied area is located to the north of the Alta Sierra de Somún Curá Volcanic Complex and is made of several basaltic volcanic buildings of varied morphologies: spatter cones, tuff ring and long lava flows related to small shield volcanoes (of scutulum type). Petrographic characteristics as well as whole rock chemical composition suggest a time progressive increase in alkalis content and a shift from early transitional terms to basanitic rocks in the latest stages. A simulation of the source yielded for Las Lomadas rocks an astenospheric source in the garnet-spinel facies, with associated low partial melting percentages (< 7-8%). Within the studied rock set, the spatter cones sequence displays geochemical affinities with the basaltic component of Alta Sierra de Somún Curá Volcanic Complex.
