Paleo-depths reconstruction of the last 550,000 years based on the transfer function on recent and Quaternary benthic foraminifers of the East Corsica margin
|Author(s)||Minto'o Charlie Morelle Angue1, 2, 3, Silva Jacinto Ricardo4, Bassetti Maria-Angela1, 2, Jouet Gwenael4|
|Affiliation(s)||1 : Univ Perpignan, CEFREM, UMR 5110, Via Domitia,52 Ave Paul Alduy, F-66860 Perpignan, France.
2 : CNRS, CEFREM UMR 5110, 52 Ave Paul Alduy, F-66860 Perpignan, France.
3 : Ecole Normale Super ENS Libreville, Dept Sci Vie & Terre, BP 17009, Libreville, Gabon.
4 : IFREMER, Ctr Bretagne, Lab Envirom Sedimentaires, F-29280 Plouzane, France.
|Source||Comptes Rendus Geoscience (1631-0713) (Elsevier France-editions Scientifiques Medicales Elsevier), 2018-12 , Vol. 350 , N. 8 , P. 476-486|
|Keyword(s)||Benthic foraminifers, East-Corsica basin, Paleo-depths, Transfer function|
In this study, the model H(i) = 109.6103 + C1 × F1(i) + C2 × F2(i) + … + C33 × F33(i) obtained from depth modelling based on 33 recent benthic foraminifer species distribution, has been applied to the fossil benthic foraminifers from the borehole GDEC-4-2 drilled at a water depth of 491 m, in the East-Corsica basin, covering the last 550,000 years. The obtained variations of the paleo-depths show a medium correlation with the oscillations of the relative sea level and also with the fluctuations of the oxygen isotopic ratio (δ18O G. bulloides and δ18O C. pachyderma–C. wuellerstorfi). This newly developed transfer function is accompanied by an error margin of ± 86 m, suggesting that this model will probably be more suitable for a time scale of the order of a million years where sea level variations are recorded with larger amplitudes. Without considering these problems related to amplitudes, it also turns out that the “eustatic” signal of the microfauna is accompanied by a “trophic” signal, which should not to be neglected, especially at a millennial scale time resolution. Thus, the application of this method would require taking into account the bottom trophic effects strongly controlling the distribution of benthic foraminifer assemblages.