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TitreVolcaniclastic sedimentation on the submarine slopes of a basaltic hotspot volcano: Piton de La Fournaise volcano (La Réunion Island, Indian Ocean)
AuteurSaint-Ange, F S A; Bachèlery, P B; Babonneau, N B; Michon, L M; Jorry, S J
SourceMarine Geology vol. 337, 2013 p. 35-52, https://doi.org/10.1016/j.margeo.2013.01.004 (Accès ouvert)
Année2013
Séries alt.Secteur des sciences de la Terre, Contribution externe 20120171
ÉditeurElsevier BV
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1016/j.margeo.2013.01.004
Mediapapier; en ligne; numérique
Formatspdf
Lat/Long OENS 55.8333 56.2500 -21.0000 -21.3333
Sujetsturbidites; dépôts de coulée de débris; coulées de débris; glissements de terrain; érosion; volcans; volcanisme; caractéristiques sous-marines; cônes sous-marins; géologie des dépôts meubles/géomorphologie; géologie marine
Illustrationslocation maps; digital elevation models; schematic diagrams; photographs; core logs
ProgrammeLa géoscience pour les développements extracôtiers de la côte est, Géoscience en mer
Résumé(disponible en anglais seulement)
Volcaniclastic successions arewell-described in volcanic arc setting but rare in hotspot environments. The present work proposes a faciesmodel of volcaniclastic sedimentation related to basaltic hotspot volcanoes as exemplified by the Piton de la Fournaise volcano (La Réunion Island). The facies model is based on a multi-scale approach combining high-resolution multibeam and backscatter data, deep-water photographs, side scan imagery and Kullenberg piston cores. Data showthat awide range of gravity flows and erosional features develop in the active volcaniclastic sedimentary system. Coastal and submarine instabilities are the main processes shaping the
volcano's submarine morphology.Meanwhile, the evolution and dynamics of the sedimentary system are strongly linked with the morpho-structural evolution of the subaerial part of the volcano. The proposed model is characterized by a cyclic succession of stages: (1) a growing stage during which sedimentary activity is mainly restricted to proximal and mid-slope areas; (2) a collapse stage that entirely reshapes the morphology of the submarine slopes; and (3) an erosional stage related to a slow down of volcanic activity, enabling the development of large deep-sea fans.
GEOSCAN ID291700