Journal Title
Title of Journal: Int J Earth Sci Geol Rundsch
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Abbravation: International Journal of Earth Sciences
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Publisher
Springer-Verlag
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Authors: Reynaldo Charrier Gérard Hérail Luisa Pinto Marcelo García Rodrigo Riquelme Marcelo Farías Nelson Muñoz
Publish Date: 2012/07/10
Volume: 102, Issue: 1, Pages: 235-264
Abstract
A review of available stratigraphic structural and magmatic evolution in northernmost Chile and adjacent Peru and Bolivia shows that in this region 1 compression on the Paleogene intraarc during the middle Eocene Incaic phase formed the NNESSWoriented Incaic range along the presentday Precordillera and Western Cordillera and 2 postIncaic tectonic conditions remained compressive until present contrasting with other regions of the Andes where extensional episodes occurred during part of this time lapse A late Oligocene–early Miocene peak of deformation caused further uplift The Incaic range formed a popup structure bounded by two thrusts systems of diverging vergencies it represented a major paleogeographic feature that separated two domains with different tectonic and paleogeographic evolutions and probably formed the Andean water divide This range has been affected by intense erosion and was symmetrically flanked by two major basins the Pampa del Tamarugal and the Altiplano Magmatic activity remained located along the previous Late Cretaceous–early Eocene arc with slight eastward shift Further compression caused westvergent thrusting and uplift along the western Eastern Cordillera bounding the Altiplano basin to the east by another popup shaped ridge Eastward progression of deformation caused eastvergent thrusting of the Eastern Cordillera and Subandean zoneThe authors acknowledge the French Institute for Collaborative Research IRD and Departamento de Geología Facultad de Ciencias Físicas y Matemáticas Universidad de Chile for their research facilities and projects Fondecyt No 1030965 and Anillo ACT No 18 Programa Bicentenario de Ciencia y TecnologíaCONICYT for financial support The authors wish to thank Drs Cathy Busby and Brian Horton for their very constructive and stimulating comments
Keywords:
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