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| HAL : insu-00549820, version 1 |
| Code Bibliographique ADS : 2010E&PSL.297..199R |
| DOI : 10.1016/J.EPSL.2010.06.020 |
| Fiche détaillée |  Récupérer au format |
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| Earth and Planetary Science Letters 297 (2010) 199-210 |
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| Renewed uplift of the Central Andes Forearc revealed by coastal evolution during the Quaternary |
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| Vincent Regard 1Marianne Saillard 1 |
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| (08/2010) |
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| Most of the Pacific coast of the Central Andes, between 15°S and 30°S, display a wide (a couple of kilometres) planar feature, gently dipping oceanwards and backed by a cliff. This morphology, usually of marine origin, is called rasa, and argues for a recent and spatially continuous uplift of the margin over the 1500-km-long coastal region we describe. The cliff foot is found at a similar elevation (˜ 110 m amsl) all over the studied area, with the exception of peninsulas such as the Mejillones Peninsula. The compilation of published chronological data and the extrapolation of re-appraised uplift rates provide evidence for a common cliff foot age of around 400 ka (i.e., Marine Isotopic Stage MIS 11). This, together with other geological constraints, indicates a Quaternary renewal of uplift in the Central Andes Forearc after a late Pliocene quiescence or subsidence. |
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| 1 : | Laboratoire des Mécanismes et Transfert en Géologie (LMTG) |
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CNRS : UMR5563 – Observatoire Midi-Pyrénées – Université Paul Sabatier [UPS] - Toulouse III – Institut de recherche pour le développement [IRD] : UMR154 |
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| 2 : | IRD |
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Institut de recherche pour le développement [IRD] |
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| 3 : | Laboratoire de géodynamique des chaines alpines (LGCA) |
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CNRS : UMR5025 – OSUG – INSU – Université de Savoie – Université Joseph Fourier - Grenoble I |
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| 4 : | Morphodynamique continentale et côtière (MCC) |
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CNRS : UMR6143 – INSU – Université de Caen Basse-Normandie – Université de Rouen |
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| 5 : | Departamento de Ciencias Geológicas |
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universidad catolica del Norte |
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| domaine | : | Planète et Univers/Sciences de la Terre/Géomorphologie |
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| Andes – Quaternary – subduction – rocky coast – geomorphology – marine terrace |
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| insu-00549820, version 1 | |
| http://hal-insu.archives-ouvertes.fr/insu-00549820 | |
| oai:hal-insu.archives-ouvertes.fr:insu-00549820 | |
| Contributeur : Pascale Talour | |
| Soumis le : Mercredi 22 Décembre 2010, 17:36:21 | |
| Dernière modification le : Mercredi 22 Décembre 2010, 17:36:21 | |
