Publications des scientifiques de l'IRD

Michaud François, Proust J. N., Collot Jean-Yves, Lebrun J. F., Witt C., Ratzov G., Pouderoux H., Martillo C., Hernandez M. J., Loayza G., Penafiel L., Schenini Laure, Dano A., Gonzalez M., Barba D., De Min L., Ponce G., Urresta A., Calderon M. (2015). Quaternary sedimentation and active faulting along the Ecuadorian shelf : preliminary results of the ATACAMES Cruise (2012). Marine Geophysical Research, 36 (1), p. 81-98. ISSN 0025-3235.

Titre du document
Quaternary sedimentation and active faulting along the Ecuadorian shelf : preliminary results of the ATACAMES Cruise (2012)
Année de publication
2015
Type de document
Article référencé dans le Web of Science WOS:000350363500005
Auteurs
Michaud François, Proust J. N., Collot Jean-Yves, Lebrun J. F., Witt C., Ratzov G., Pouderoux H., Martillo C., Hernandez M. J., Loayza G., Penafiel L., Schenini Laure, Dano A., Gonzalez M., Barba D., De Min L., Ponce G., Urresta A., Calderon M.
Source
Marine Geophysical Research, 2015, 36 (1), p. 81-98 ISSN 0025-3235
Selected high-resolution seismic-reflection profiles and multibeam bathymetry acquired along the convergent Ecuador margin during the ATACAMES cruise on onboard the R/V L'Atalante (Jan.15-Feb.18, 2012) allow a preliminary evaluation of the neotectonic development and stratigraphic evolution of the margin based on the sismo-stratigraphic analysis of Quaternary sediment preserved on the margin shelf and upper slope. We present three major preliminary results. (1) The evolution of the Esmeraldas, Guayaquil and Santa Elena canyons. The head of the Esmeraldas canyon is the location of a continuous significant sediment transport. The Guayaquil canyon shows several episodes of deposition and incision. Aggrading sedimentation pattern in the canyon records several changes in relative sea-level. The subsidence of the Gulf of Guayaquil probably contributes to the good preservation of the canyon filling stages. The Santa Elena canyon is controlled by a SW-NE trending normal fault. (2) Variations of sediment accumulation and relative vertical motions are shown along-strike the shelf edge. Offshore the uplifted Manta peninsula, a pronounced subsidence of the shelf edge is documented by sedimentary clinoforms that have deposited in a morphological reentrant, and have migrated upslope testifying of a local subsidence meanwhile the adjacent La Plata Island area underwent uplift. In the Esmeraldas canyon area, a local uplift of the shelf is documented. (3) Two neotectonic fault systems with a possible transcurrent component are imaged across the shelf edge and upper margin slope offshore Jama, and Cape Galera. This possible transcurrent motion could be related to the reactivation of ancient faults of the upper plate by the subduction. These preliminary results indicate that the ATACAMES data set has a strong potential to evaluate the spatial and temporal contribution of tectonic and climate changes on the structural development and stratigraphic evolution of the Ecuador continental margin.
Plan de classement
Géologie et formations superficielles [064] ; Géophysique interne [066]
Description Géographique
EQUATEUR
Localisation
Fonds IRD [F B010064049]
Identifiant IRD
fdi:010064049
Contact