Évolution Néogène de la partie centrale des Andes de Mérida (Venezuela) : analyse structurale, modélisation géologique et numérique d'un système en échappement

Abstract : The geology of the Mérida Andes is well described at the surface, but its deep structure remains hypothetic. Our work integrated various information coming from geological observations, satellite images and geophysical data to propose a crustal scale deformation model of the mountain belt. In order to better understand the role played by the Boconó fault in the orogeny, we carried out a geomorpho-structural study in the La González basin whose opening is directly related to the movement along the fault. Based on balanced geological cross-sections and the orogenic float concept, we established a deformation model that explains both the strain partitioning and the escape processes. Major faults traces were used to build a 3D geological model of the orogen. The model shows that the escape of the Trujillo block is controlled by both lateral compression and gravity forces. Finally, we validated the escape model using a 2D numerical simulation that allows a better constraint of the distribution of the deformation that is directly linked to friction along faults.
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Applied geology. Université de Pau et des Pays de l'Adour, 2009. French


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Submitted on : Monday, June 14, 2010 - 9:57:55 PM
Last modification on : Tuesday, June 15, 2010 - 9:46:17 AM

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Bernard Monod. Évolution Néogène de la partie centrale des Andes de Mérida (Venezuela) : analyse structurale, modélisation géologique et numérique d'un système en échappement. Applied geology. Université de Pau et des Pays de l'Adour, 2009. French. <tel-00492032>

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