INVESTIGADORES
GREGORI Daniel Alfredo
artículos
Título:
Early Jurassic tectonomagmatic stages in the western North Patagonian Region, Argentina: insights from the Comallo volcanic sedimentary complex
Autor/es:
BARROS, MERCEDES; PAVÓN PIVETTA, CECILIA; GREGORI, DANIEL A.; BENEDINI, LEONARDO; STRAZZERE, LEONARDO; GERALDES, MAURO C.; MARCOS, PAULO
Revista:
INTERNATIONAL GEOLOGY REVIEW
Editorial:
TAYLOR & FRANCIS INC
Referencias:
Año: 2023 vol. x p. 1 - 25
ISSN:
0020-6814
Resumen:
The Comallo volcanic sedimentary Complex in the western North Patagonian Region begins withthe development and collapse of Plinian-type eruptive columns of rhyolitic and dacitic composition associated to vent at approximately 192 Ma. Synchronous deposits are originating in alluvialand lagoon environments. The ƐHf(t) values obtained in zircon grains indicate possible derivationby melting Paleoproterozoic and Mesoproterozoic crust. Upwards in the sequence appears basalticand andesitic lava flows, as well as pyroclastic deposits produced during the eruptions. Thisvolcanism is related to sustained pyroclastic fountains with a U-Pb zircon age of 185 Ma. Thevolcanic rocks were possibly derived from Paleoproterozoic, Mesoproterozoic, and Neoproterozoiccrust affected by juvenile magmas in volcanic-arc environments. Chemical and isotopic variationsare mainly due to changes in the local and regional tectonic conditions, the thickness of thecontinental crust, as well as the dip and age of the subducted oceanic crust.
