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TitreA volcaniclastic deep-sea fan off La Réunion Island (Indian Ocean): gradualism versus catastrophism
AuteurSaint-Ange, F; Savoye, B; Michon, L; Bachelery, P; Deplus, C; DeVoogd, B; Dyment, J; LeDrezen, E; Voisset, M; LeFriant, A; Boudon, G
SourceGeology vol. 39, no. 3, 2011 p. 271-274, https://doi.org/10.1130/G31478.1 (Accès ouvert)
Année2011
Séries alt.Secteur des sciences de la Terre, Contribution externe 20100249
ÉditeurGeological Society of America
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1130/G31478.1
Mediapapier; en ligne; numérique
Formatspdf
Lat/Long OENS 53.0000 56.0000 -21.0000 -23.0000
Sujetscaractéristiques sous-marines; cônes sous-marins; transport sous-marin; volcanoclastique; turbidites; sédimentation turbiditique; milieu sédimentaire; sedimentation; milieux sédimentaires; géophysique; géologie marine; sédimentologie
Illustrationslocation maps; profiles; photographs
ProgrammeGéoscience de la côte Est, Géoscience en mer
Diffusé2011 03 01
Résumé(disponible en anglais seulement)
A new geophysical data set off La Réunion Island (western Indian Ocean) reveals a large volcaniclastic submarine fan developing in an open-ocean setting. The fan is connected to a torrential river that floods during tropical cyclones. Sediment storage at the coast is limited, suggesting that the sediments are carried directly to the basin. The fan morphology and turbidites in cores lead us to classify it as a sand-rich system mainly fed by hyperpycnal flows. In the ancient geological record, there are many examples of thick volcaniclastic successions, but studies of modern analogues have emphasized mechanisms such as debris avalanches or direct pyroclastic flow into the sea. Because the Cilaos deep-sea fan is isolated from any continental source, it provides information on architecture and noncatastrophic processes in a volcaniclastic deep-sea fan.
GEOSCAN ID287081