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AGU: Tectonics

 

Keywords

  • structural geology
  • volcanism
  • tectonics

Index Terms

  • Tectonophysics: Tectonics and magmatism
  • Tectonophysics: Volcanic arcs
  • Structural Geology: Folds and folding
  • Geographic Location: South America
  • Information Related to Geologic Time: Cenozoic

Abstract

TECTONICS, VOL. 28, TC6003, 18 PP., 2009
doi:10.1029/2009TC002538

Coeval compressional deformation and volcanism in the central Andes, case studies from northern Chile (23°S–24°S)

Gabriel González

Departamento de Ciencias Geológicas, Facultad de Ingeniería y Ciencias Geológicas, Universidad Católica del Norte, Antofagasta, Chile

José Cembrano

Departamento de Ciencias Geológicas, Facultad de Ingeniería y Ciencias Geológicas, Universidad Católica del Norte, Antofagasta, Chile

Felipe Aron

Departamento de Ciencias Geológicas, Facultad de Ingeniería y Ciencias Geológicas, Universidad Católica del Norte, Antofagasta, Chile

Eugenio E. Veloso

Departamento de Ciencias Geológicas, Facultad de Ingeniería y Ciencias Geológicas, Universidad Católica del Norte, Antofagasta, Chile

J. Bruce H. Shyu

Section Geology, Department of Earth and Environmental Sciences, Ludwig-Maximilians University, Munich, Germany

In this contribution we examine the relationship between active compression and construction of Pleistocene volcanoes in the present-day magmatic arc of the central Andes (23°S–24°S). Deformation produced several N–S striking, ∼40 km long subparallel ridges. These ridges formed by folding of Pliocene ignimbrites and upper Pliocene and Pleistocene lavas; they are asymmetrical in profile and have a gentle back limb and steeper frontal limb. Andesitic monogenetic volcanoes show a close spatial relationship with the ridges; some volcanoes are on the hinge zone, whereas others lay on the sides of the ridges. We interpret this spatial pattern as a result of magma storage and migration along a system of subhorizontal reservoirs and reverse faults. Magma reservoirs probably formed along flat portions of reverse faults between ramp structures that serve as episodic magma transport pathways.

Received 22 May 2009; accepted 24 August 2009; published 1 December 2009.

Citation: González, G., J. Cembrano, F. Aron, E. E. Veloso, and J. B. H. Shyu (2009), Coeval compressional deformation and volcanism in the central Andes, case studies from northern Chile (23°S–24°S), Tectonics, 28, TC6003, doi:10.1029/2009TC002538.

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