Mg/Ca-paleothermometry in the western Mediterranean Sea on planktonic foraminifer species Globigerina bulloides: Constraints and implications |
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| Authors: | Soumaya Boussetta Nejib Kallel Franck Bassinot Laurent Labeyrie Jean-Claude Duplessy Nicolas Caillon Fabien Dewilde Hélène Rebaubier |
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| Institution: | 1. University of Sfax, FSS, laboratoire GEOGLOB, route de Soukra, BP 802, 3028 Sfax, Tunisia;2. LSCE (CEA/CNRS/UVSQ), domaine du CNRS, bâtiment 12, avenue de la Terrasse, 91198 Gif-sur-Yvette, France |
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| Abstract: | We generated a high-resolution SSTMg/Ca record for the surface-dwelling planktonic foraminifera Globigerina bulloides from the core MD99-2346 collected in the Gulf of Lion, and compared it to that obtained using modern analogue techniques applied to fossil foraminiferal assemblages (SSTMAT). The two temperature records display similar patterns during the last 28,000 years but the SSTMg/Ca estimates are several degrees warmer (∼ +4 °C) than SSTMAT. The temperature shift between SSTMg/Ca and SSTMAT remained relatively constant over time. This seems to exclude a bias on the Mg/Ca record associated with salinity or secondary Mg-rich calcite encrustation on the foraminiferal tests during early diagenesis. Therefore, anomalously high Mg/Ca suggests either: (1) the empirical equation for G. bulloides of Elderfield and Ganssen (2000) is incorrect; or (2) there is a specific Mediterranean genotypes of G. bulloides for which a specific Mg/Ca-temperature calibration is needed. |
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| Keywords: | Mediterranean Mg/Ca Planktonic foraminifera Sea surface Temperature Salinity Diagenesis Vital effect |
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