EL MAGMATISMO DE ARCO PALEÓGENO TARDÍO-NEÓGENO EN LOS ANDES CENTRALES DEL SUR (28°-37°S): UNA REVISIÓN INTEGRAL

LITVAK, VANESA D.; POMA, STELLA; JONES, ROSIE; DÍAZ, IRIS; ANDRÉS FOLGUERA; LINDA KIRSTEIN; SPAGNUOLO, MAURO G.; FERNÁNDEZ PAZ, LUCÍA; IANNELLI, SOFÍA; RAMOS, VICTOR A.

San Miguel de Tucumán

Congreso; 20° Congreso Geológico Argentino; 2017

Asociación Geológica Argentina

Arc-related magmatism in the Southern Central Andes is strongly controlled by changes in the geometry and composition of the subducted slab as reflected in the geochemical evolution of arc-related products over the Late Miocene Payenia shallow subduction zone and the present-day Pampean flat-slab segment. Both segments show a progressive foreland expansion and migration of the volcanic arc, as shown by the geochemical signature of arc-related rocks, which is correlated to the more compressional style of deformation associated with the shallowing of the slab, with a relatively similar timing. The collision of the Juan Fernandez Ridge is likely the cause of the progressive shallowing throughout both segments since Early to Middle Miocene times.