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Calibration of Δ18O of Laboratory-cultured Deep-sea Benthic Foraminiferal Shells in Function of Temperature : Volume 7, Issue 1 (18/01/2010)

By Barras, C.

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Book Id: WPLBN0004005484
Format Type: PDF Article :
File Size: Pages 16
Reproduction Date: 2015

Title: Calibration of Δ18O of Laboratory-cultured Deep-sea Benthic Foraminiferal Shells in Function of Temperature : Volume 7, Issue 1 (18/01/2010)  
Author: Barras, C.
Volume: Vol. 7, Issue 1
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Geslin, E., Duplessy, J., Michel, E., Jorissen, F. J., & Barras, C. (2010). Calibration of Δ18O of Laboratory-cultured Deep-sea Benthic Foraminiferal Shells in Function of Temperature : Volume 7, Issue 1 (18/01/2010). Retrieved from

Description: Laboratory of Recent and Fossil Bio-Indicators (BIAF), UPRES EA 2644, CNRS-INSU UMS 3281 OSUNA, Angers University, 49045 Angers Cedex, France. The geochemical composition of deep-sea benthic foraminifera is widely used to reconstruct sea floor paleoenvironments. The calibration of the applied proxy methods has until now been based on in situ 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 in 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 Δ18O in Bulimina marginata is parallel to the thermodynamically determined curve observed in inorganically precipitated calcite (-0.22‰ °C-1). This observation validates the use of Δ18O of benthic foraminifera in paleoceanographical studies. Over the studied size range (50 to 300 Μm), the effect of test size was 0.0014‰ Μm-1, confirming previous suggestions of a substantial test size effect on Δ18O 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).

Calibration of Δ18O of laboratory-cultured deep-sea benthic foraminiferal shells in function of temperature

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