Puceat（eの頭に´）,E., Joachimski,M.M., Bouilloux,A., Monna,F., Bonin,A., Motreuil,S., Moriniere（最初のeの頭に｀）,P., Henard（eの頭に´）,S., Mourin,J., Dera,G. and Quesne,D.(2010): Revised phosphate-water fractionation equation reassessing paleotemperatures derived from biogenic apatite. Earth and Planetary Science Letters, 298, 135-142.

『生物源燐灰石から得られた古水温を再評価する改定したリン酸塩−水分別式』

『Abstract
　Oxygen isotopes of biogenic apatite have been widely used to reassess anomalous temperatures inferred from oxygen isotope ratios of ancient biogenic calcite, more prone to diagenetic alteration. However, recent studies have highlighted that oxygen isotope ratios of biogenic apatite differ dependent on used analytical techniques. This questions the applicability of the phosphate-water fractionation equations established over 25 years ago using earlier analytical techniques to more recently acquired data. In this work we present a new phosphate-water oxygen isotope fractionation equation based on oxygen isotopes determined on fish raised in aquariums at controlled temperature and with monitored water oxygen isotope composition. The new equation reveals a similar slope, but an offset of about + 2‰ to the earlier published equations. This work has major implications for paleoclimatic reconstructions using oxygen isotopes of biogenic apatite since calculated temperatures have been underestimated by about 4 to 8℃ depending on applied techniques and standardization of the analyses.

Keywords: apatite; oxygen isotopes; paleotemperature; fractionation』

1. Introduction
2. Experimental
3. Material and methods
4. Results
　4.1. Variation of the water oxygen isotope composition during the experiment
　4.2. Variations of phosphate-water oxygen isotope fractionation with temperature
5. Discussion
　5.1. Comparison with earlier published fractionation equations
　5.2. A new phosphate-water fractionation equation
　5.3. Implication for previously published paleotemperatures
6. Conclusion
Acknowledgments
References

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