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| DOI | 10.1029/2008TC002269 | ||||
| Año | 2008 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
Using available information on the magnitude and age of tectonic shortening, as well as paleomagnetically determined tectonic rotations, we have run a series of 2-D map view restorations of the central Andes. Neogene shortening in the foreland belt induced only slight orogenic curvature of the central Andes. The constraints on the ages of the large observed fore-arc rotations (average of 37 degrees counterclockwise in southern Peru and 29 degrees clockwise in northern Chile) indicate that the Bolivian Orocline formed during the Eocene-Oligocene as a consequence of differential shortening focused in the Eastern Cordillera. To minimize local block rotations along the fore arc, the restoration that best fits the central Andean rotation pattern requires about 400 km of total (Paleogene plus Neogene) shortening near the Arica bend. This value corresponds to the upper bound of estimates of maximum horizontal shortening for the central Andes. Along-strike variations in horizontal shortening in the back arc induced bending of the continental margin, block rotations with fore-arc along-strike extension, and/or orogen-parallel transport of upper crustal material toward the symmetry axis of the orocline.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | ARRIAGADA-ORTEGA, CESAR ARTURO | Hombre |
Universidad de Chile - Chile
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| 2 | Roperch, Pierrick | Hombre |
Univ Rennes - Francia
Univ Toulouse - Francia Géosciences Rennes - Francia Université de Toulouse - Francia Université Fédérale Toulouse Midi-Pyrénées - Francia |
| 3 | MPODOZIS-MARIN, CONSTANTINO | Hombre |
Antofagasta Minerals - Chile
Antofagasta Minerals S.A. - Chile |
| 4 | Cobbold, Peter R. | Hombre |
Univ Rennes - Francia
Géosciences Rennes - Francia |
| Agradecimiento |
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| Funding for this study was provided by Fondecyt-Chile ( grants 1050750 and 3030050) and IRD. We thank Delphine Rouby for her help during the initial stages of the work and for providing the numerical code for the restoration program. We are grateful for helpful reviews from two anonymous referees. N. McQuarrie, M. Beck, S. Lamb, and E. Sobel provided valuable criticism of an earlier version of the manuscript. |