Paleogene Arc-Related Volcanism in the Southern Central Andes and North Patagonia (39°?41° S)

IANNELLI, SOFÍA B.; FERNÁNDEZ PAZ, LUCÍA; LITVAK, VANESA D.; JONES, ROSEMARY E.; RAMOS, MIGUEL E.; FOLGUERA, ANDRÉS; RAMOS, VÍCTOR A.

The Evolution of the Chilean-Argentinean Andes

Springer

Año: 2018;

The influence of tectonic processes in evolution of magmatic suites evaluated through their geochemical signature has always been a subject of debate. Late Paleocene arc volcanism in the Southern Central Andes, particularly in North Patagonia, can be used to infer a direct relationship between episodes andtectonic changes along the Andean margin. Eocene arc-related (*44 Ma) in the North Patagonian Andes shows evidence for limited influence of the subductingslab on the composition of arc magmas and they alkaline tendency. By Oligocene times (*29 Ma), arc volcanic sequences the Auca Pan depocenter show predominantly arc-like geochemical signatures have been derived from a calc-alkaline source. However, a comparison younger arc sequences (