The Jurassic magmatism of the Demerara Plateau (offshore French Guiana) as a remnant of the Sierra Leone hotspot during the Atlantic rifting

Type Article
Date 2020-05
Language English
Author(s) Basile Christophe1, Girault Igor1, Paquette Jean-Louis2, Agranier Arnaud3, Loncke Lies4, Heuret Arnauld5, Poetisi Ewald6
Affiliation(s) 1 : Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, 38000, Grenoble, France
2 : Université Clermont Auvergne, CNRS, IRD, OPGC, Laboratoire Magmas et Volcans, F-63000 10, Clermont-Ferrand, France
3 : Laboratoire Géosciences Océan (UMR CNRS 6538), Université de Bretagne Occidentale & Institut Universitaire Européen de la Mer, Place Nicolas Copernic, 29280, Plouzané, France
4 : Université de Perpignan, CEFREM – UMR 5110, 66860, Perpignan, France
5 : Université de Guyane, Géosciences Montpellier, 97300, Cayenne, France
6 : Anton de Kom University of Suriname, Paramaribo, SA, Suriname
Source Scientific Reports (2045-2322) (Springer Science and Business Media LLC), 2020-05 , Vol. 10 , N. 1 , P. 7486 (12p.)
DOI 10.1038/s41598-020-64333-5
WOS© Times Cited 6
Abstract

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.

Full Text
File Pages Size Access
Publisher's official version 12 8 MB Open access
Supplementary Information 7 1 MB Open access
Top of the page

How to cite 

Basile Christophe, Girault Igor, Paquette Jean-Louis, Agranier Arnaud, Loncke Lies, Heuret Arnauld, Poetisi Ewald (2020). The Jurassic magmatism of the Demerara Plateau (offshore French Guiana) as a remnant of the Sierra Leone hotspot during the Atlantic rifting. Scientific Reports, 10(1), 7486 (12p.). Publisher's official version : https://doi.org/10.1038/s41598-020-64333-5 , Open Access version : https://archimer.ifremer.fr/doc/00628/74034/