Rathmann, Söhnke;
Hess, Silvia;
Kuhnert, Henning;
Mulitza, Stefan
Mg/Ca ratios of the benthic foraminifera Oridorsalis umbonatus obtained by laser ablation from core top sediments: Relationship to bottom water temperature
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Media type:
E-Article
Title:
Mg/Ca ratios of the benthic foraminifera Oridorsalis umbonatus obtained by laser ablation from core top sediments: Relationship to bottom water temperature
Contributor:
Rathmann, Söhnke;
Hess, Silvia;
Kuhnert, Henning;
Mulitza, Stefan
Published:
American Geophysical Union (AGU), 2004
Published in:
Geochemistry, Geophysics, Geosystems, 5 (2004) 12
Language:
English
DOI:
10.1029/2004gc000808
ISSN:
1525-2027
Origination:
Footnote:
Description:
A laser ablation system connected to an inductively coupled plasma mass spectrometer was used to determine Mg/Ca ratios of the benthic foraminifera Oridorsalis umbonatus. A set of modern core top samples collected along a depth transect on the continental slope off Namibia (320–2300 m water depth; 2.9° to 10.4°C) was used to calibrate the Mg/Ca ratio against bottom water temperature. The resulting Mg/Ca–bottom water temperature relationship of O. umbonatus is described by the exponential equation Mg/Ca = 1.528*e0.09*BWT. The temperature sensitivity of this equation is similar to previously published calibrations based on Cibicidoides species, suggesting that the Mg/Ca ratio of O. umbonatus is a valuable proxy for thermocline and deep water temperature.