FN Archimer Export Format
PT J
TI Seafloor morphology and sediment transfer in the mixed carbonate-siliciclastic environment of the Lesser Antilles forearc along Barbuda to St. Lucia
BT 
AF Seibert, C.
   Feuillet, N.
   Ratzov, Gueorgui
   Beck, C.
   Cattaneo, Antonio
AS 1:1;2:1;3:2;4:3;5:4;
FF 1:;2:;3:;4:;5:PDG-REM-GM-LAD;
C1 Université de Paris, Institut de physique du globe de Paris, CNRS, F-75005 Paris, France
   Géoazur, Université de Nice Sophia-Antipolis, CNRS, Observatoire de la Côte d'Azur, 250 rue Albert Einstein, 06560 Valbonne, France
   CNRS ISTerre, Université Savoie-Mont-Blanc, 73 376 Le Bourget du Lac, France
   IFREMER, Géosciences Marines, BP. 70, 29280 Plouzané, France
C2 IPGP, FRANCE
   UNIV NICE, FRANCE
   CNRS, FRANCE
   IFREMER, FRANCE
SI BREST
SE PDG-REM-GM-LAD
IN WOS Ifremer UPR
   copubli-france
   copubli-univ-france
IF 3.548
TC 6
UR https://archimer.ifremer.fr/doc/00635/74689/74600.pdf
LA English
DT Article
CR AGUADOMAR
   BATHYSAINTES
   CARAVAL
   CASEIS
   GWADASEIS
   LITTO 3D LEG 1
   LITTO 3D LEG 2
   LITTO 3D LEG 3
   SISMANTILLES 2
BO L'Atalante
   Pourquoi pas ?
   Le Suroît
   Beautemps-Beaupré
DE ;Seafloor morphology;Backscatter;Submarine canyons;Landslides;Lesser Antilles arc
AB The Lesser Antilles arc is a mixed siliciclastic and carbonate active margin made of active volcanic and flat plio-quaternary carbonate islands. It was built as a result of a complex tectonic history at the slowly converging boundary between the American plates and the Caribbean plate. The sedimentary processes as a consequence of external forcing (earthquakes, volcanism, hurricanes) were rarely documented in such environment and are poorly understood. We exploited an exceptional dataset of high-resolution marine seafloor data acquired during the last 20 years in the northern part half of the Lesser Antilles forearc to document the sediment-transport processes. We achieved a detailed morpho-sedimentary study from multi-beam bathymetry, backscattering, and seismic profiles. Two areas could be characterized: 1) the “Rough Area”, along Barbuda to Guadeloupe carbonated islands, characterized by steep (up to 25°) slopes incised by short canyons, and deep basins controlled by major normal faults; 2) the “Channelized Area”, south of Guadeloupe and bordered by active volcanic islands and carbonate platforms, characterized by gentle slopes incised by long canyons. During sea-level high-stands, the sediments seem exported from the carbonate platform by hurricanes or density cascading but appear to settle at the shelf-edge and canyon heads. During sea-level low-stands, a connection may exist between onshore and offshore systems. However, this sediment supply appears not sufficient to generate canyon formation, likely shaped by regressive processes. Shelf breaks of the carbonate banks, platforms and submarine slopes are affected by sediment failures. Some may be associated to voluminous remobilizations and large mass transport deposits. Large earthquakes are likely the main processes in this area to remobilize sediments toward the deep forearc basins by triggering both slope failures and flushing of the canyon head. 
PY 2020
PD OCT
SO Marine Geology
SN 0025-3227
PU Elsevier BV
VL 428
UT 000561216500001
DI 10.1016/j.margeo.2020.106242
ID 74689
ER

EF