Plio-Quaternary tectono-magmatic zonation and plate tectonics in the Central Andes

Details Plio-Quaternary tectono-magmatic zonation and plate tectonics in the Central Andes Plio-Quaternary tectono-magmatic zonation and plate tectonics in the Central Andes

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..33..231m&link_type=abstract

Earth and Planetary Science Letters, Volume 33, Issue 2, p. 231-238.

Computer Science

6

Scientific paper

Seismic provinces in Peru and northern Chile may be defined in direct relation to the geometry of parts of Nazca plate that are being subducted under the Americas plate. Recent tectonism and calc-alkaline volcanism appear also to have a clear relationship to that same geometry of the subducted slab. Under northern and central Peru, the slab plunges at 10-15° to the northeast, and becomes almost horizontal farther east; at surface in the same region, recent calc-alkaline volcanism is absent and recent tectonics are mostly compressional. Under southern Peru and northern Chile, the slab plunges regularly at about 30° to the east; at the surface, calc-alkaline volcanism is still active and recent tectonism appears to be mostly extensional. Au Pérou et dans le nord du Chili, on peut définir des provinces sismiques dont les limites correspondent à des changements dans la géométrie de la partie ouest de la plaque de Nazca en cours de subduction sous la plaque des Amériques. II semble que la tectonique récente et le volcanisme calco-alcalin plio-quaternaire soient également liés à cette géométrie variable. Ainsi, ous sle Pérou nord et central, la plaque de Nazca plonge à 10-15° sous la côte puis devient subhorizontale plus à l'est; à cette géométrie correspondent en surface une tectonique récente essentiellement compressive et une absence à peu près complète de volcanisme calco-alcalin récent. A l'opposé, ce volcanisme a été très intense et étendu dans le sud du Pérou et le nord du Chili au Plio-Quaternaire, il y est encore actif de nos jours; la tectonique récente y est essentiellement distensive; correlativement, la plaque océanique plonge régulièrement à 30° sous le continent.

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