Upper Cretaceous intrusives in the Coastal Cordillera near Valdivia: forearc magmatism related to the passage of a triple junction?
نویسندگان
چکیده
Upper Cretaceous intrusives of limited extent crop out in the Coastal Cordillera near Valdivia (39º48’ S), 100 km west main topographic divide Andean Cordillera. Given that plutonic rocks same age at latitudes high Andes coastal emplaced a forearc position upper plate subduction setting. They correspond to hypabyssal displaying mainly porphyritic texture and lithological variations with microtonalites (minor), microgranodiorites (main) microgranites. intrude Paleozoic-Triassic accretionary complex Bahia Mansa Metamorphic Complex. These intrusives, comprise Chaihuín Pluton minor stocks felsic rocks, have calc-alkaline affinities metaluminous peraluminous character. are geochemically similar contemporaneous arc-related Gualletué Plutonic Group. The microgranitoids dacitic from Los Boldos, low Loncoche peculiar because they show an apparently adakitic affinity Sr/Y LaN/YbN discriminant diagrams; nevertheless Sr contents these (
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ژورنال
عنوان ژورنال: Andean Geology
سال: 2021
ISSN: ['0718-7106', '0718-7092']
DOI: https://doi.org/10.5027/andgeov48n1-3062