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| Barras, C.; Duplessy, J. -c.; Geslin, E.; Michel, Elisabeth; Jorissen, F. J.. |
| 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 degrees C). The new laboratory protocols developed for this study allowed us to produce large quantities of shells in stable... |
| Tipo: Text |
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| Ano: 2010 |
URL: https://archimer.ifremer.fr/doc/00241/35177/33738.pdf |
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| Wit, J. C.; De Nooijer, L. J.; Barras, C.; Jorissen, F. J.; Reichart, G. J.. |
| The reconstruction of past temperatures is often achieved through measuring the Mg/Ca value of foraminiferal test carbonate. The diversity in foraminiferal Mg/Ca-temperature calibrations suggests that there is also a biological control on this proxy. This study presents a new Mg/Ca-temperature calibration for the benthic foraminifer Bulimina marginata, based on cultures under a range of temperatures (4-14 degrees C). Measured Mg/Ca values for B. marginata correlate with temperature (Mg/Ca = (1.10+/-0.10) e((0.045+/-0.009)) T, R-2 = 0.28 p < 0.01). The inter-individual variability is, however, also significant (standard deviation is 10-35% of the average). Before applying this or any calibration, the effect of the inter-individual variability on the... |
| Tipo: Text |
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| Ano: 2012 |
URL: https://archimer.ifremer.fr/doc/00249/36045/34589.pdf |
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