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G-Cubed: Geochemistry, Geophysics, Geosystems

 

Keywords

  • benthic foraminifera
  • Mg/Ca thermometry
  • laser ablation ICP-MS
  • trace elements
  • temperature
  • marine geochemistry

Index Terms

  • Oceanography: General: Paleoceanography
  • Oceanography: Biological and Chemical: Trace elements
  • Oceanography: Biological and Chemical: Geochemistry
Abstract
Cited By (8)
 

Abstract

GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, VOL. 5, Q12013, 10 PP., 2004
doi:10.1029/2004GC000808 [Citation]

Mg/Ca ratios of the benthic foraminifera Oridorsalis umbonatus obtained by laser ablation from core top sediments: Relationship to bottom water temperature

Söhnke Rathmann

DFG-Research Center Ocean Margins, University of Bremen, Bremen, P.O. Box 330 440, D-28334 Germany

Silvia Hess

DFG-Research Center Ocean Margins, University of Bremen, Bremen, P.O. Box 330 440, D-28334 Germany

Henning Kuhnert

DFG-Research Center Ocean Margins, University of Bremen, Bremen, P.O. Box 330 440, D-28334 Germany

Stefan Mulitza

DFG-Research Center Ocean Margins, University of Bremen, Bremen, P.O. Box 330 440, D-28334 Germany

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.

Received 23 July 2004; accepted 26 October 2004; published 30 December 2004.

Citation: Rathmann, S., S. Hess, H. Kuhnert, and S. Mulitza (2004), Mg/Ca ratios of the benthic foraminifera Oridorsalis umbonatus obtained by laser ablation from core top sediments: Relationship to bottom water temperature, Geochem. Geophys. Geosyst., 5, Q12013, doi:10.1029/2004GC000808.

Cited By

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