This work characterizes Late Cretaceous calc-alkaline volcanic rocks in Gastre, Northern Patagonia, Argentina. These newly found porphyritic rocks bear an 40Ar–39Ar amphibole age of ~ 74–76 Ma, a subduction-type geochemical signature and a deep, garnet-bearing source. Extruded in a stage of low magmatic activity in the Northern Patagonian Andes (~ 41–44° S), they could represent an eastward migration of the Late Cretaceous magmatic arc that was associated with a regional compressive deformational stage in the South American margin. Copyright © Cambridge University Press 2018
Documento: | Artículo |
Título: | First geochemical and geochronological characterization of Late Cretaceous mesosilicic magmatism in Gastre, Northern Patagonia, and its tectonic relation to other coeval volcanic rocks in the region |
Autor: | ZAFFARANA, C.; LAGORIO, S.; ORTS, D.; BUSTEROS, A.; NIETO, D.S.; GIACOSA, R.; RUIZ GONZÁLEZ, V.; BOLTSHAUSER, B.; PUIGDOMENECH NEGRE, C.; SOMOZA, R.; HALLER, M. |
Filiación: | Universidad Nacional de Río Negro, Sede Alto Valle-Valle Medio. Av. Julio A. Roca 1242 General Roca (8332), Pcia. de Río Negro, Argentina Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Godoy Cruz 2290, C1425FQB, Buenos Aires, Argentina Servicio Geológico Minero Argentino (SEGEMAR), Av. General Paz 5445, B1650WAB, Buenos Aires, Argentina Departamento de Geología de la FCEyN, Universidad de Buenos Aires, Intendente Güiraldes 2160, Ciudad Universitaria, C1428EGA, Buenos Aires, Argentina Universidad Nacional de la Patagonia San Juan Bosco, Puerto Madryn, Argentina, Argentina |
Palabras clave: | Chile Ridge; compressive deformation; slab shallowing; subduction magmatism; Tres Picos Prieto |
Año: | 2018 |
Página de inicio: | 1 |
Página de fin: | 10 |
DOI: | http://dx.doi.org/10.1017/S0016756818000432 |
Título revista: | Geological Magazine |
Título revista abreviado: | Geol. Mag. |
ISSN: | 00167568 |
Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00167568_v_n_p1_ZAFFARANA |