FN Archimer Export Format
PT J
TI Volcanic influence during the formation of a transform marginal plateau: Insights from wide-angle seismic data along the northwestern Demerara Plateau
BT 
AF PADRON MORA, Crelia
   Klingelhoefer, Frauke
   ROEST, Walter
   Graindorge, David
   Loncke, Lies
   Basile, Christophe
   Sapin, François
   Lesourd-Laux, Thomas
   MUSEUR, Thomas
AS 1:1,2;2:2;3:2;4:6;5:3;6:4;7:5;8:2;9:2;10:;
FF 1:PDG-REM-GM-LAD;2:PDG-REM-GEOOCEAN-ALMA;3:PDG-REM-GEOOCEAN-ALMA;4:;5:;6:;7:;8:PDG-REM-GEOOCEAN-ALMA;9:PDG-REM-GM-LAD;10:;
C1 Departamento de Ciencias de la Tierra, Universidad Simón Bolívar (USB), Caracas, Venezuela
   Geo-Ocean, Univ. Brest, CNRS, Ifremer, UMR6538, 29280 Plouzane, France
   Univ. Perpignan Via Domitia, Centre de Formation et de Recherche sur les Environnements Méditerranéens (CEFREM), UMR 5110, 52 Avenue Paul Alduy, 66860 Perpignan, France
   Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, 38000, France
   TotalEnergies SE, Centre Scientifique et Technique Jean Feger (CSTJF), Avenue Larribau, 64018 Pau, France
   Geo-Ocean, Univ. Brest, CNRS, Ifremer, UMR6538, 29280 Plouzane, France
C2 UNIV SIMON BOLIVAR, VENEZUELA
   IFREMER, FRANCE
   UNIV PERPIGNAN, FRANCE
   UNIV GRENOBLE ALPES, FRANCE
   TOTAL ENERGIES, FRANCE
   UBO, FRANCE
SI BREST
SE PDG-REM-GM-LAD
   PDG-REM-GEOOCEAN-ALMA
UM GEO-OCEAN
IN WOS Ifremer UMR
   WOS Cotutelle UMR
   copubli-france
   copubli-univ-france
   copubli-int-hors-europe
   copubli-sud
IF 2.9
TC 0
UR https://archimer.ifremer.fr/doc/00796/90832/96443.pdf
LA English
DT Article
CR MARGATS
BO L'Atalante
DE ;Dermerara Plateau;Wide-angle seismics;Volcanic margins;Equatorial Atlantic
AB Transform marginal plateaus (TMPs) are submarine seafloor highs located at the continental slope, often at the boundary of two ocean basins of different ages and associated to at least one transform or highly oblique margin. The systematic study of TMPs can, therefore, answer questions about rifting and continental margin development. The Demerara TMP (offshore Suriname and French Guiana) is located at the border between the Central Atlantic, which opened during the Lower Jurassic and the Equatorial Atlantic, which opened during the Lower Cretaceous. This study, based on wide-angle seismic data modeling from the northern and western section of the Demerara Plateau, provides information on both the lower volcanic unit of this TMP and the adjacent oceanic crust. The results confirm that the crust of the Demerara Plateau is around 30 km thick and consists of lava flows possibly mixed with crust of continental origin in its deeper layers. Seismic velocities (exceeding 7 km/s) are compatible with those of volcanic oceanic plateaus. To the west, a relatively wide transition zone separates the plateau from the Jurassic oceanic crust, which is composed of two layers, and is much thicker than normal oceanic crust (~11 km). During the Cretaceous, the plateau was sharply cut by transform and highly oblique structures, separating the Demerara Plateau from its transform conjugate, the Guinea Plateau. As a result, the Demerara Plateau is flanked to the north by a magma-poor/strongly tectonized Cretaceous oceanic domain with thin (2–3 km) crust, likely partially consisting of serpentinized mantle. In contrast, the oceanic crust located towards the south-east appears to be more characteristic of typical oceanic crust in composition though slightly thinner than normal (4–6 km) thickness. Our analysis allows us to propose a new 3D vision of the crustal structure of the Demerara TMP and its borders. 
PY 2022
PD NOV
SO Tectonophysics
SN 0040-1951
PU Elsevier BV
VL 842
UT 000868105300002
DI 10.1016/j.tecto.2022.229592
ID 90832
ER

EF