 |
HAL - OMP |  |
|
HAL - OMP | |
| HAL : insu-00610899, version 1 |
| DOI : 10.1016/j.geomorph.2010.08.003 |
| Fiche détaillée |  Récupérer au format |
 |
| Geomorphology 127, 3-4 (2011) 121-142 |
|
|
|
|
| Uplift of Quaternary shorelines in Eastern Patagonia : Darwin revisited |
|
|
| Kevin Pedoja 1Vincent Regard 2 |
|
|
| (2011) |
|
|
|
| During his journey on the Beagle, Darwin observed the uniformity in the elevation of coastal Eastern Patagonia along more than 2000 km. More than one century later, the sequences of Quaternary shorelines of eastern Patagonia have been described and their deposits dated but not yet interpreted in terms of geodynamics. Consequently, we i) mapped the repartition of the Quaternary coastal sequences in Argentinean Patagonia, ii) secured accurate altitudes of shoreline angles associated with erosional morphologies (i.e. marine terraces and notches), iii) took into account previous chrono-stratigraphical interpretations in order to calculate mean uplift rates since ~440 ka (MIS 11) and proposed age ranges for the higher and older features (up to ~180 m), and iv) focused on the Last Interglacial Maximum terrace (MIS 5e) as the best constrained marine terrace (in terms of age and altitude) in order to use it as a tectonic benchmark to quantify uplift rates along the entire passive margin of Eastern South America. Our results show that the eastern Patagonia uplift is constant through time and twice the uplift of the rest of the South American margin. We suggest that the enhanced uplift along the eastern Patagonian coast that interested Darwin during his journey around South America on the Beagle could originate from the subduction of the Chile ridge and the associated dynamic uplift. |
|
|
|
|
|
|
|
|
|
|
|
| 1 : | Morphodynamique continentale et côtière (MCC) |
|
|
|
CNRS : UMR6143 – INSU – Université de Caen Basse-Normandie – Université de Rouen |
|
|
| 2 : | Laboratoire des Mécanismes et Transfert en Géologie (LMTG) |
|
|
|
CNRS : UMR5563 – Observatoire Midi-Pyrénées – Université Paul Sabatier [UPS] - Toulouse III – Institut de recherche pour le développement [IRD] : UMR154 |
|
|
| 3 : | Géosciences Rennes (GR) |
|
|
|
CNRS : UMR6118 – INSU – Centre Armoricain de Recherches en Environnement – Université de Rennes 1 |
|
|
| 4 : | Laboratoire de Planétologie et Géodynamique de Nantes (LPGN) |
|
|
|
CNRS : UMR6112 – INSU – Université de Nantes |
|
|
|
|
|
|
|
|
|
| domaine | : | Planète et Univers/Sciences de la Terre/Stratigraphie Planète et Univers/Sciences de la Terre/Tectonique Sciences de l'environnement/Milieux et Changements globaux |
|
|
| Quaternary – Coastal sequences – Uplift – Passive margin – Patagonia – Argentina – South America |
|
| insu-00610899, version 1 | |
| http://hal-insu.archives-ouvertes.fr/insu-00610899 | |
| oai:hal-insu.archives-ouvertes.fr:insu-00610899 | |
| Contributeur : Isabelle Dubigeon | |
| Soumis le : Lundi 25 Juillet 2011, 11:28:36 | |
| Dernière modification le : Lundi 25 Juillet 2011, 11:28:36 | |
