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| DOI | 10.5027/ANDGEOV40N3-A02 | ||||||
| Año | 2013 | ||||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
In this paper we show the results of a paleomagnetic study carried out along the western Andes of central Chile from 30 degrees to 36 degrees S. Whereas paleomagnetic analysis from Jurassic to Late Cretaceous rocks in the Pampean flat slab segment shows small or non significant clockwise vertical-axis rotations, results obtained in Late Jurassic to Neogeone rocks to the south, on the normal subduction segment, show sistematically clockwise rotations up to 40 degrees. Paleomagnetic rotations are coeval with thrusting along the High Andes in Late Miocene times. We propose a coupled Bolivian Orocline-Juan Fernandez Ridge (JFR) model where a far-field component of clockwise rotation related to the formation of the Bolivian Orocline was first acquired by the margin between 31 degrees and 33 degrees S. The same area was later rotated by a slight counterclockwise component related to the subduction of the JFR over the last 10 Ma. South of 33 degrees S the clockwise rotations related to the Bolivian Orocline component were amplified by the subduction of the JFR.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | ARRIAGADA-ORTEGA, CESAR ARTURO | Hombre |
Universidad de Chile - Chile
Centro de Excelencia en Geotermia de Los Andes - Chile |
| 2 | Ferrando, Rodolfo | Hombre |
Universidad de Chile - Chile
Servicio Nacional de Geología y Minería - Chile Centro de Excelencia en Geotermia de Los Andes - Chile |
| 3 | CORDOVA-VARAS, MARIA LORETO | Mujer |
Universidad de Chile - Chile
Servicio Nacional de Geología y Minería - Chile Centro de Excelencia en Geotermia de Los Andes - Chile |
| 4 | MORATA-CESPEDES, DIEGO ANTONIO | Hombre |
Universidad de Chile - Chile
Centro de Excelencia en Geotermia de Los Andes - Chile |
| 5 | Roperch, Pierrick | Hombre |
UNIV RENNES 1 - Francia
Université de Rennes1 - Francia Géosciences Rennes - Francia |
| Fuente |
|---|
| FONDECYT |
| Universidad de Chile |
| FONDECYT-Chile |
| PBCT |
| Institut de recherche pour le développement |
| Fondecyt grant PBCT Anillo ACT 18 |
| cooperative program IRD/Departamento de Geologia, Universidad de Chile |
| Agradecimiento |
|---|
| Funding for this study was provided by Fondecyt-Chile (grants 1070964 and 1080468), Fondecyt grant PBCT Anillo ACT 18 and a cooperative program IRD/Departamento de Geologia, Universidad de Chile. Discussions and comments on earlier vesions of the manuscript by C. Mpodozis, R. Charrier, M. Far as, G. Yanez and reviews by A. Rapalini, M. Calvo and J. Skarmeta greatly improved the original version of this article. |