Author:
Basile Christophe,Girault Igor,Paquette Jean-Louis,Agranier Arnaud,Loncke Lies,Heuret Arnauld,Poetisi Ewald
Abstract
AbstractWe 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.
Publisher
Springer Science and Business Media LLC
Reference60 articles.
1. Kumar, N. Origin of “paired” aseismic rises: Cearà and Sierra Leone rises in the Equatorial, and the Rio Grande Rise and Walvis Ridge in the South Atlantic. Marine Geology 30, 175–191, https://doi.org/10.1016/0025-3227(79)90014-8 (1979).
2. Burke, K. & Torsvik, T. H. Derivation of Large Igneous Provinces of the past 200 million years from long-term heterogeneities in the deep mantle. Earth and Planetary Science Letters 227, 531–538, https://doi.org/10.1016/j.epsl.2004.09.015 (2004).
3. Mercier de Lépinay, M. Inventaire mondial des marges transformantes et évolution tectono-sédimentaire des plateaux de Demerara et de Guinée. Ph. D. thesis, University of Perpignan, 335 p. (2016).
4. Reuber, K. R., Pindell, J. & Horn, B. W. Demerara Rise, offshore Suriname: magma-rich segment of the Central Atlantic Ocean, and conjugate to the Bahamas hot spot. Interpretation 4, T141–T155, https://doi.org/10.1190/INT-2014-0246.1 (2016).
5. Bryan, S. E. & Ernst, R. E. Revised definition of Large Igneous Province (LIPs). Earth-Science Reviews 86, 175–202, https://doi.org/10.1016/j.earscirev.2007.08.008 (2008).
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