Publications des scientifiques de l'IRD

Martinod J., Regard V., Letourmy Y., Henry H., Hassani R., Baratchart S., Carretier Sébastien. (2016). How do subduction processes contribute to forearc Andean uplift ? Insights from numerical models. Journal of Geodynamics, 96, p. 6-18. ISSN 0264-3707.

Titre du document
How do subduction processes contribute to forearc Andean uplift ? Insights from numerical models
Année de publication
2016
Type de document
Article référencé dans le Web of Science WOS:000375162500002
Auteurs
Martinod J., Regard V., Letourmy Y., Henry H., Hassani R., Baratchart S., Carretier Sébastien
Source
Journal of Geodynamics, 2016, 96, p. 6-18 ISSN 0264-3707
We present numerical models to study how changes in the process of subduction may explain the observed Quaternary uplift of the Andean forearc region. Indeed, most segments of the South American Pacific coasts between 16 and 32 degrees S have been uplifting since the Lower Pleistocene, following a period of stability of the forearc region. Models confirm that local uplift is expected to occur above ridges, this phenomenon being predominant in central Peru where the Nazca Ridge is subducting. We investigate the effects of slab pull, interplate friction and convergence velocity on the vertical displacements of the overriding plate. We propose that the global tendency to coastal uplift is accompanying the deceleration of the Nazca-South America convergence that occurred in the Pleistocene. In contrast, forearc subsidence may accompany increasing convergence velocities, as suggested by the subsidence history of the South America active margin.
Plan de classement
Géologie et formations superficielles [064] ; Géophysique interne [066]
Description Géographique
CHILI ; EQUATEUR ; PEROU ; ANDES ; PACIFIQUE
Localisation
Fonds IRD [F B010066847]
Identifiant IRD
fdi:010066847
Contact