FN Archimer Export Format PT J TI The Jurassic magmatism of the Demerara Plateau (offshore French Guiana) as a remnant of the Sierra Leone hotspot during the Atlantic rifting BT AF Basile, Christophe Girault, Igor Paquette, Jean-Louis Agranier, Arnaud Loncke, Lies Heuret, Arnauld Poetisi, Ewald AS 1:1;2:1;3:2;4:3;5:4;6:5;7:6; FF 1:;2:;3:;4:;5:;6:;7:; C1 Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, 38000, Grenoble, France Université Clermont Auvergne, CNRS, IRD, OPGC, Laboratoire Magmas et Volcans, F-63000 10, Clermont-Ferrand, France Laboratoire Géosciences Océan (UMR CNRS 6538), Université de Bretagne Occidentale & Institut Universitaire Européen de la Mer, Place Nicolas Copernic, 29280, Plouzané, France Université de Perpignan, CEFREM – UMR 5110, 66860, Perpignan, France Université de Guyane, Géosciences Montpellier, 97300, Cayenne, France Anton de Kom University of Suriname, Paramaribo, SA, Suriname C2 UNIV GRENOBLE ALPES, FRANCE UNIV CLERMONT AUVERGNE, FRANCE UBO, FRANCE UNIV PERPIGNAN, FRANCE UNIV GUYANE, FRANCE UNIV SURINAME, SURINAME UM LGO IN DOAJ IF 4.379 TC 20 UR https://archimer.ifremer.fr/doc/00628/74034/73363.pdf https://archimer.ifremer.fr/doc/00628/74034/73364.pdf LA English DT Article CR DRADEM GUYAPLAC IGUANES MARGATS BO Pourquoi pas ? L'Atalante AB We report the discovery of 173.4 Ma hotspot-related magmatic rocks in the basement of the Demerara Plateau, offshore French Guiana and Suriname. According to plate reconstructions, a single hotspot may be responsible for the magmatic formation of (1) both the Demerara Plateau (between 180 and 170 Ma) and the Guinea Plateau (circa 165 Ma) during the end of the Jurassic rifting of the Central Atlantic; (2) both Sierra Leone and Ceara Rises (mainly from 76 to 68 Ma) during the upper Cretaceous oceanic spreading of the Equatorial Atlantic ocean; (3) the Bathymetrists seamount chain since the upper Cretaceous. The present-day location of the inferred Sierra Leone hotspot should be 100 km west of the Knipovich Seamount. PY 2020 PD MAY SO Scientific Reports SN 2045-2322 PU Springer Science and Business Media LLC VL 10 IS 1 UT 000560030700032 DI 10.1038/s41598-020-64333-5 ID 74034 ER EF