Producción CyT
Calderas cenozoicas argentinas de la Zona Volcánica Central de los Andes ? procesos eruptivos y dinámica: una revisión
Capítulo de Libro
Autoría:
Guzmán, S ; Grosse, P. ; Martí, J. ; Petrinovic, I. ; Guzmán, S.; Petrinovic, I.; Bord, A., Hongn, F.; Seggiaro, R.; Montero, C.; Carniel, R.; Dantas, E.; Sudo, M.Fecha:
2017Editorial y Lugar de Edición:
Asociacion Geologica ArgentinaLibro:
Ciencias de la Tierra y Recursos Naturales del NOA. Relatorio del XX Congreso Geológico Argentino (pp. 518-547)Asociacion Geologica Argentina
ISBN:
978-987-42-6666-8Resumen *
Collapse calderas have extruded more than 13,000 km3 of magma in the 21-28° S segment of the Andean Central Volcanic Zone since ~17 Ma until 5,000 yr BP. Since 10 Ma intense magmatism related to calderas was predominantly clusterednorth of 25° S, and since 6 Ma until 2 Ma was important along and across the Altiplano-Puna plateau. Within Argentina, there are at least 10 circular to elliptical collapse calderas. Of these calderas, eight have emitted individually magma volumes of > 50 km3 to 1,400 km3, they have a main axis > 10 km, ages between ~17 and ~2 Ma and are mainly dacitic to rhyodacitic. Two calderas emitt ed individually magma volumes < 21 km3, their main axis is < 13 km, theyare < 1 Ma, rhyodacitic to rhyolitic, and are located south of 26° 30? S. Most Andean calderas have collapsed at early eruption stages, forming low and dense eruptive columns that collapsed almost immediately to form pyroclastic density currents; there are few examples of collapse calderas that were preceded by plinian eruptions. Información suministrada por el agente en SIGEVAPalabras Clave
ALTIPLANOPUNAANDES CENTRALESCALDERAIGNIMBRITA