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Géodynamique andine : résumés étendus = Andean geodynamics : extended abstracts = Geodinamica andina : resumenes ampliados

Authors
Publisher
IRD
Publication Date
Keywords
  • Geologie Regionale
  • Geologie Structurale
  • Orogenese
  • Profil Geologique
Disciplines
  • Earth Science

Abstract

A geological cross-section of the Andean orogen at 25.5°LS 6th International Symposium on Andean Geodynamics (ISAG 2005, Barcelona), Extended Abstracts: 536-539 A geological cross-section of the Andean orogen at 25.5 0 LS J. A. Muiioz" A. Amilibia 2, N. Carrera 1, R. Mon 3, G. Chong 4, E. Roca 1, ft F. Sàbat 1 , Dpt. de Geodinàmica i Geofisica, Facultat de Geologia UB, Marti i Franqués sIn, 08028-Barcelona, josepœgeo.ub.es. [email protected] 2 Dpt. of Geology, Royal Holloway, University of London, Egham, Surrey TW20 OEX. 3 Dpt. de Geologia, Facultat de Ciencias Naturales e Instituto Miguel Lillo, Universidad Nacional de Tucurnàn, Miguel Lillo 205 4000 Tucumàn (Argentina). 4 Dpto. de Ciencias Geolôgicas, Universidad Catôlica del Norte, Avd. Angamos 0610, Antofagasta, Ghile The Andes is the type orogen for subduction contractional systems but man y uncertainties still exist about the crustal structure and few complete cross-sections have been done and publ ished. Estimates of shortening have been in the past years a matter of debate mainly as far as the deficit of tectonic shortening to account for the known crustai thickness is concerned. Estimates for this shortening have rnainly relied on shortening calculations made on cros s-sections of parts of the orogen (Baby et al. 1997). Il is known that along strike motion of material do occur in any rnountain belt and has to be taken into account in any precise orogenie mass balance. 1t has also recently argued that the shortening deficit in the Andes results from plane strain calculations not considering the out of plane section motion of material (Hindle et al., 2005) . However, 20 estimates of shortening on cross- section balancing are still a first valid approximation to a mass balance and construction of cross-sections across the entire Andean orogen is a priority. A complete cross-section of the Central Andes at 25.5 LS has been constructed based mostly on surface geological data. This work has involved field

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