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Dynamique du soulèvement côtier Pléistocène des Andes centrales : Etude de l'évolution géomorphologique et datations (10Be) de séquences de terrasses marines (Sud Pérou - Nord Chili).

Abstract : Geomorphic study and dating of marine terrace sequences along the coastal part of the Central Andean forearc evidence longitudinal and temporal variations in the response of the South American plate to the Nazca plate subduction during Pleistocene. The average uplift rates vary between 229 ± 40 (17.8°S) and 696 ± 53 mm/ka (15.33°S) along the coast. Rapid uplift periods alternate with slower uplift during the Pleistocene times. The morphologic evolution of the forearc is directly linked to active tectonic processes occurring along the subduction zone. Below a threshold in the coast-trench distance of about 100-110 km, the marine terraces are preserved and record the highest uplift rates of the whole Andean coastal front. The episodic uplift would be a result of the seismogenic zone surface variations during the Pleistocene and the related variation in the coast-trench distance.
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https://tel.archives-ouvertes.fr/tel-00329922
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Submitted on : Tuesday, October 14, 2008 - 3:42:30 PM
Last modification on : Monday, April 5, 2021 - 2:26:09 PM
Long-term archiving on: : Monday, June 7, 2010 - 6:09:03 PM

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Marianne Saillard. Dynamique du soulèvement côtier Pléistocène des Andes centrales : Etude de l'évolution géomorphologique et datations (10Be) de séquences de terrasses marines (Sud Pérou - Nord Chili).. Sciences de la Terre. Université Paul Sabatier - Toulouse III, 2008. Français. ⟨tel-00329922⟩

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