FN Archimer Export Format
PT J
TI Elongated giant seabed polygons and underlying polygonal faults as indicators of the creep deformation of Pliocene to recent sediments in the Grenada Basin, Caribbean Sea
BT 
AF Gay, Aurelien
   Padron, C.
   Meyer, S.
   Beaufort, D.
   Oliot, E.
   Lallemand, S.
   Marcaillou, B.
   Philippon, M.
   Cornée, J‐J.
   Audemard, F.
   Lebrun, J‐F.
   Klingelhoefer, Frauke
   Mercier de Lepinay, B.
   Münch, P.
   Garrocq, C.
   Boucard, M.
   Schenini, L.
AS 1:1;2:2,3;3:1,4;4:5;5:1;6:1;7:4;8:1;9:1;10:6;11:1;12:3;13:4;14:1;15:1;16:1,4;17:4;18:;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:PDG-REM-GM-LAD;13:;14:;15:;16:;17:;18:;
C1 Géosciences Montpellier CNRS Université de Montpellier, Université des Antilles, Place Eugène Bataillon,34095 Montpellier, France
   Departamento de Ciencias de la Tierra, Universidad Simón Bolívar (USB), Caracas, Venezuela
   Géosciences Marines, Ifremer, ZI de la Pointe du Diable CS 1007029280 Plouzané, France
   Géoazur, Université Côte d’Azur CNRS IRD Observatoire de la Côte d’Azur Géoazur250 Avenue Albert Einstein 06560 Valbonne, France
   Université de Poitiers, IC2MP ‐ UMR 7285 ‐ CNRSRue Michel Brunet F‐86073Poitiers cedex 9, France
   Universidad Nacional de San Luis, San Luis, Argentina
C2 UNIV MONTPELLIER, FRANCE
   UNIV SIMON BOLIVAR, VENEZUELA
   IFREMER, FRANCE
   UNIV NICE, FRANCE
   UNIV POITIERS, FRANCE
   UNIV NACL SAN LUIS, ARGENTINA
SI BREST
SE PDG-REM-GM-LAD
IN WOS Ifremer UPR
   copubli-france
   copubli-univ-france
   copubli-int-hors-europe
   copubli-sud
IF 4.48
TC 6
UR https://archimer.ifremer.fr/doc/00733/84531/89626.pdf
   https://archimer.ifremer.fr/doc/00733/84531/91817.pdf
LA English
DT Article
CR GARANTI
BO L'Atalante
DE ;polygonal faults;seabed polygons;fluid seep;volumetric contraction;creep deformation
AB Based on 2D seismic profiles, multibeam and seabed grab cores acquired during the Garanti cruise in 2017, 1-5 km wide seabed giant polygons were identified in the Grenada basin, covering a total area of ∼55000 km2, which is the largest area of outcropping polygonal faults (PF) ever found on Earth so far. They represent the top part of an active 700-1200 m thick underlying polygonal fault system (PFS) formed due to the volumetric contraction of clay- and smectite-rich sediments, initiated in the sub-surface at the transition between the Early to Middle Pliocene. The short axes of the best-fit ellipses obtained from a graphical centre-to-centre method were interpreted as the local orientation of a preferential contraction perpendicular to the creep deformation of slope sediments. In the North Grenada Basin, the polygons are relatively regular, but their short axes seem to be parallel to a N40°E extension recently evidenced in the forearc, possibly extending in the backarc, but not shown in the study area. They are most probably related to a progressive burial due to a homogeneous subsidence. In the South Grenada Basin, the polygons are more elongated and their axes are progressively rotating southeastward towards the depocenter, indicating a creep deformation towards the center of the basin created by a differential subsidence. Seabed polygons and underlying PF could thus be indicative of the deformation regime of shallow sediments related to main slopes controlled by two different basin architectures. 
PY 2021
PD DEC
SO Geochemistry Geophysics Geosystems
SN 1525-2027
PU American Geophysical Union (AGU)
VL 22
IS 12
UT 000735891600026
DI 10.1029/2021GC009809
ID 84531
ER

EF