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
- 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.
DOIAbstract
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.Fil: Zaffarana, Claudia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Río Negro; ArgentinaFil: Lagorio, Silvia Adriana. Universidad Nacional de Río Negro; ...
Add to ORKG