info:eu-repo/semantics/article
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
Fecha
2019-07Registro en:
Zaffarana, Claudia Beatriz; Lagorio, Silvia Adriana; Orts, Darío Leandro; Busteros, Alicia; Silva Nieto, Diego Gonzalo; et al.; 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; Cambridge University Press; Geological Magazine; 156; 7; 7-2019; 1285-1294
0016-7568
CONICET Digital
CONICET
Autor
Zaffarana, Claudia Beatriz
Lagorio, Silvia Adriana
Orts, Darío Leandro
Busteros, Alicia
Silva Nieto, Diego Gonzalo
Giacosa, Raúl
Ruiz González, Víctor
Boltshauser, Barbara
Puigdomenech Negre, Carla Gimena
Somoza, Ruben
Haller, Miguel Jorge F.
Resumen
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.