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Observatoire Midi-Pyrénées |  |
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Observatoire Midi-Pyrénées | |
| HAL: hal-00492568, version 1 |
| IRD Horizon id: fdi:010050887 |
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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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| (2010-06-11) |
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| Most of the Pacific coast of the Central Andes, between 15°S and 30°S, displays a wide (a couple of kilometres) planar feature, gently dipping oceanwards and backed by a cliff. This morphology, usually of marine orgin, is called rasa, and argues for a recent and spatially continuous uplift of the margin over the 1,500-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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| Subject | : | Sciences of the Universe/Earth Sciences/Geomorphology Sciences of the Universe/Earth Sciences/Tectonics Environmental Sciences/Global Changes |
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| Andes – Quaternary – Subduction – Rocky Coast – Geomorphology – Marine Terrace |
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| Attached file list to this document: | ||||||||||
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| hal-00492568, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00492568 | |
| oai:hal.archives-ouvertes.fr:hal-00492568 | |
| From: Vincent Regard | |
| Submitted on: Wednesday, 16 June 2010 14:06:35 | |
| Updated on: Saturday, 19 June 2010 10:11:35 | |
