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Neogene ignimbrites and volcanic edifices in southern Peru: Stratigraphy and time-volume-composition relationships
Fecha
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Thouret, J.; Mamani, M.; Wörner, G.; Paquereau-Lebti, P.; Gerbe, M.; Delacour, A.; Rivera, M.; Cacya, L.; Mariño, J. & Singer, B. (2008). Neogene ignimbrites and volcanic edifices in southern Peru: Stratigraphy and time-volume-composition relationships. En: International Symposium on Andean Geodynamics, 7. Nice, 2008. Extended abstracts. Paris: IRD Éditions, p. 545-548.
7th International Symposium on Andean Geodynamics (ISAG 2008, Nice), 2-4 September, 2008, Extended Abstracts.
Autor
Thouret, Jean-Claude
Mamani Huisa, Mirian Irene
Wörner, Gerhard
Paquereau-Lebti, Perrine
Gerbe, Marie Christine
Delacour, Adélie
Rivera Porras, Marco Antonio
Cacya Dueñas, Lourdes
Mariño Salazar, Jersy
Singer, Bradley S.
Institución
Resumen
In the Central Andes of Peru, four volcanic arcs, termed Tacaza, Lower and Upper Barroso, and Frontal arc, have been active over the past 30 Ma (Fig. 1). They form five units between Moquegua and Nazca (14°30– 17°15’°S and 70–74°W). The ‘Neogene ignimbrites’ (<25 Ma) comprise six generations of widespread sheets
(>500 km2 and >20 km3 each), representing a major crustal melting event, triggered by thickening and advective heat input from the mantle wedge. Also, four generations of edifices (i.e shields, composite cones, and dome clusters) and monogenetic fields mostly overly the ignimbrites based on ages, stratigraphy and mapping.