Biogeosciences
www.biogeosciences.net
1726-4170
1726-4189
7
4
2010
10.5194/bg-7-1349-2010
http://www.biogeosciences.net/7/1349/2010/
http://www.biogeosciences.net/7/1349/2010/bg-7-1349-2010.html
http://www.biogeosciences.net/7/1349/2010/bg-7-1349-2010.pdf
1349
1356
2010-04-29
Calibration of δ<sup>18</sup>O of cultured benthic foraminiferal calcite as a function of temperature
C. Barras
christine.barras@univ-angers.fr
J.-C. Duplessy
E. Geslin
E. Michel
F. J. Jorissen
Laboratory of Recent and Fossil Bio-Indicators (BIAF) UPRES EA 2644, CNRS-INSU UMS 3281 OSUNA, Angers University, France, and Laboratory of Marine Bio-Indicators (LEBIM), Ile d'Yeu, France
Laboratoire des Sciences du Climat et de l'Environnement (LSCE), CEA-CNRS-UVSQ, Gif-sur-Yvette, France
The geochemical composition of deep-sea benthic foraminiferal calcite is
widely used to reconstruct sea floor paleoenvironments. The calibration of
the applied proxy methods has until now been based on field observations in
complex natural ecosystems where multiple factors are interfering. However,
laboratory experiments with stable physico-chemical conditions appear to be
the ideal way to evaluate the influence of a single parameter. In this
paper, we present the oxygen isotopic composition of deep-sea benthic
foraminiferal shells entirely calcified under controlled experimental
conditions over a large temperature range (4 to 19 °C). The new
laboratory protocols developed for this study allowed us to produce large
quantities of shells in stable conditions, so that also the shell size
effect could be investigated. It appears that when considering a narrow test
size range, the curve describing the temperature dependency of δ<sup>18</sup>O in <i>Bulimina marginata</i> is parallel to the thermodynamically
determined curve observed
in inorganically precipitated calcite (−0.22‰ °C<sup>−1</sup>). This
observation validates the use of δ<sup>18</sup>O of this benthic species
in paleoceanographical studies. Over the studied size range (50 to 300 μm),
the effect of test size was 0.0014‰ μm<sup>−1</sup>, confirming previous
suggestions of a substantial test size effect on δ<sup>18</sup>O of
benthic foraminifera. This study opens new perspectives for future proxy
calibrations in laboratory set-ups with deep-sea benthic foraminifera (e.g. quantification of the influence of the carbonate chemistry).
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