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Pré-Publication, Document De Travail Année : 2010

Renewed uplift of the Central Andes Forearc revealed by coastal evolution during the Quaternary

Résumé

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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Dates et versions

hal-00492568 , version 1 (16-06-2010)

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Vincent Regard, Marianne Saillard, Joseph Martinod, Laurence Audin, Sébastien Carretier, et al.. Renewed uplift of the Central Andes Forearc revealed by coastal evolution during the Quaternary. 2010. ⟨hal-00492568⟩
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