Mg/Ca-paleothermometry in the western Mediterranean Sea on planktonic foraminifer species Globigerina bulloides: Constraints and implications

Type Article
Date 2012-05
Language English
Author(s) Boussetta Soumaya1, Kallel Nejib1, Bassinot Franck2, Labeyrie Laurent2, Duplessy Jean-Claude2, Caillon Nicolas2, Dewilde Fabien2, Rebaubier Helene2
Affiliation(s) 1 : Univ Sfax, FSS, Lab GEOGLOB, Sfax 3028, Tunisia.
2 : CNRS, LSCE, CEA, UVSQ, F-91198 Gif Sur Yvette, France.
Source Comptes Rendus Geoscience (1631-0713) (Elsevier France-editions Scientifiques Medicales Elsevier), 2012-05 , Vol. 344 , N. 5 , P. 267-276
DOI 10.1016/j.crte.2012.02.001
WOS© Times Cited 8
Keyword(s) Mediterranean, Mg/Ca, Planktonic foraminifera, Sea surface Temperature, Salinity, Diagenesis, Vital effect
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 (similar to+4 degrees 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. (c) 2012 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
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Boussetta Soumaya, Kallel Nejib, Bassinot Franck, Labeyrie Laurent, Duplessy Jean-Claude, Caillon Nicolas, Dewilde Fabien, Rebaubier Helene (2012). Mg/Ca-paleothermometry in the western Mediterranean Sea on planktonic foraminifer species Globigerina bulloides: Constraints and implications. Comptes Rendus Geoscience, 344(5), 267-276. Publisher's official version : https://doi.org/10.1016/j.crte.2012.02.001 , Open Access version : https://archimer.ifremer.fr/doc/00139/25047/