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Oxygen isotope compositions of phosphate from arvicoline teeth and Quaternary climatic changes, Gigny, French Jura |
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| Authors: | Nicolas Navarro Christophe Lécuyer Sophie Montuire Cyril Langlois |
| Institution: | a UMR CNRS 5561-Biogéosciences, Centre des Sciences de la Terre, Université de Bourgogne, 21000 Dijon, France b UMR CNRS 5125-PEPS Paléoenvironnements and Paléobiosphère, Université Claude Bernard Lyon 1, 69622 Villeurbanne, France c Institut Universitaire de France, 75005 Paris, France d EPHE-Ecole Pratique des Hautes Etudes, 21000 Dijon, France |
| Abstract: | Oxygen isotope compositions of biogenic phosphates from mammals are widely used as proxies of the isotopic compositions of meteoric waters that are roughly linearly related to the air temperature at high- and mid-latitudes. An oxygen isotope fractionation equation was determined by using present-day European arvicoline (rodents) tooth phosphate: δ18Op = 20.98(±0.59) + 0.572(±0.065) δ18Ow. This fractionation equation was applied to the Late Pleistocene karstic sequence of Gigny, French Jura. Comparison between the oxygen isotope compositions of arvicoline tooth phosphate and Greenland ice core records suggests to reconsider the previously established hypothetical chronology of the sequence. According to the δ18O value of meteoric water-mean air temperature relationships, the δ18O value of arvicoline teeth records variations in mean air temperatures that range from 0° to 15°C. |
| Keywords: | Oxygen isotope Phosphate Arvicolinae Pleistocene Climate |
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