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

  • Sofía B. Iannelli
  • Lucía Fernández Paz
  • Vanesa D. Litvak
  • Rosemary E. Jones
  • Miguel E. Ramos
  • Andrés Folguera
  • Victor A. Ramos
Chapter
Part of the Springer Earth System Sciences book series (SPRINGEREARTH)

Abstract

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 magmatic episodes and tectonic changes along the Andean margin. Eocene arc-related volcanism (~44 Ma) in the North Patagonian Andes shows evidence for limited influence of the subducting slab on the composition of arc magmas and they exhibit an alkaline tendency. By Oligocene times (~29 Ma), arc volcanic sequences in the Auca Pan depocenter show predominantly arc-like geochemical signatures and have been derived from a calc-alkaline source. However, a comparison with younger arc sequences (<28 Ma) in the region suggests that the magmatic source turned more tholeiitic in composition with a remarkable increase in the influence of slab-derived fluids, as seen in volcanic rocks from Cura Mallín and Abanico retro and intra-arc basins. It is proposed that the marked geochemical variations between these magmatic periods are related to the tectonic changes associated with the breakup of the Farallon plate at ~28–26 Ma. The geochemical data from Eocene and Oligocene volcanic sequences provide further evidence for the strong link between tectonics and magmatism.

Keywords

Arc-related rocks Geochemical signature Eocene Oligocene Farallon plate 

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© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • Sofía B. Iannelli
    • 1
  • Lucía Fernández Paz
    • 1
  • Vanesa D. Litvak
    • 1
  • Rosemary E. Jones
    • 2
  • Miguel E. Ramos
    • 1
  • Andrés Folguera
    • 1
  • Victor A. Ramos
    • 3
  1. 1.Instituto de Estudios Andinos (IDEAN), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)Universidad de Buenos AiresBuenos AiresArgentina
  2. 2.Department of Earth SciencesUniversity of OxfordOxfordUK
  3. 3.Instituto de Estudios Andinos “Don Pablo Groeber”, Departamento de Ciencias Geológicas, FCENUniversidad de Buenos Aires–CONICETBuenos AiresArgentina

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