Renewed uplift of the Central Andes Forearc revealed by coastal evolution during the Quaternary
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- 作者：Vincent Regard ; Marianne Saillard ; Joseph Martinod ; Laurence Audin ; Sé ; bastien Carretier ; Kevin Pedoja ; Rodrigo Riquelme ; Paola Paredes ; Gé ; rard Hé ; rail
- 关键词：Andes ; Quaternary ; subduction ; rocky coast ; geomorphology ; marine terrace
- 刊名：Earth and Planetary Science Letters
- 出版年：2010
- 出版时间：15 August 2010
- 年：2010
- 卷：297
- 期：1-2
- 页码：199-210
- 全文大小：2258 K
文摘
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.