The Birth of the Gondwanide Arc: Geological, Structural and Geochemical Constraints on Carboniferous Magmatism of the North Patagonian Andes (Argentina)
2022; RELX Group (Netherlands); Linguagem: Inglês
10.2139/ssrn.4297745
ISSN1556-5068
AutoresMaria Belen Yoya, Sebastián Oriolo, Pablo Diego González, Florencia B. Restelli, Emiliano M. Renda, Florencia Bechis, Jerónimo Christie Newbery, Paulo Marcos, Ezequiel Olaizola,
Tópico(s)Geochemistry and Geologic Mapping
ResumoNew geological, structural, and geochemical information was obtained for the late Paleozoic basement of the North Patagonian Andes. The studied rocks are mainly formed by foliated diorites and gabbro-diorites with a primitive continental arc signature.These rocks have crystallization ages between ca. 330 and 323 Ma and are grouped into the Guillelmo-Serrucho Plutonic Complex. Similar characteristics and ages permit the correlation of this unit with other plutonic bodies located in the North Patagonian Andes, North Patagonian Massif and Cordillera de la Costa of Chile documenting the onset of Gondwanide subduction along the proto-Pacific margin of Gondwana.Geochemical and geochronological data, together with field evidence, suggest mafic magma replenishment during the construction of this large batholith. The presence of sheeted zones and magmatic fabrics allow to interpret pluton emplacement in a highly coupled system linked with a tectonically active setting, under pressure conditions of ca. 6 ± 1 Kbar approximately.
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