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 |
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Affiliation: | 1. Université de Perpignan Via Domitia, CEFREM, UMR 5110, 52, avenue Paul-Alduy, 66860 Perpignan, France;2. CNRS, CEFREM UMR 5110, 52, avenue Paul-Alduy, 66860 Perpignan, France;3. École normale supérieure (ENS) de Libreville – Département des sciences de la vie et de la Terre, BP : 17009, Libreville, Gabon;4. IFREMER, Centre Bretagne, Laboratoire “Environnements sédimentaires”, 29280 Plouzané, France |
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Abstract: | 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. |
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Keywords: | Benthic foraminifers East-Corsica basin Paleo-depths Transfer function |
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