| type de publication : |
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Articles dans des revues avec comité de lecture |
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| domaine : |
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Planète et Univers/Sciences de la Terre/Géomorphologie
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| titre : |
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Renewed uplift of the Central Andes Forearc revealed by coastal evolution during the Quaternary |
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| auteur(s) : |
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Vincent Regard 1, Marianne Saillard 1, Joseph Martinod 1, Laurence Audin 1, 2, 3, Sébastien Carretier 1, Kevin Pedoja 4, Rodrigo Riquelme 5, Paola Paredes 1, Gérard Hérail 1 |
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| laboratoire : |
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| résumé : |
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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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langue du texte
intégral : |
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Anglais |
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| journal : |
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| Earth and Planetary Science Letters (Earth Planet. Sci. Lett.) |
| Publisher |
Elsevier |
| ISSN |
0012-821X |
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| Audience : |
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internationale |
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| date de publication : |
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08/2010 |
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| volume : |
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297 |
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| page, identifiant, ... : |
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199-210 |
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| mots-clés : |
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Andes – Quaternary – subduction – rocky coast – geomorphology – marine terrace |
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