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On the interest and the limits of using combined ESR/U-series model in the case of very late uranium uptake |
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| Authors: | C Falgures J-J Bahain J-M Dolo N Mercier H Valladas |
| Institution: | aDépartement de Préhistoire du Muséum National d’Histoire Naturelle, UMR 5198 du CNRS, 1 rue René Panhard, 75013 Paris, France bLaboratoire National Henri Becquerel, CEA Saclay, 91191 Gif-sur-Yvette, France cLaboratoire des Sciences du Climat et de l’Environnement (LSCE), Unité Mixte de Recherche CNRS-CEA, Avenue de la Terrasse, 91198 Gif-sur-Yvette, France |
| Abstract: | Before ESR/U-series models were applied to ungulate teeth, it is generally assumed that calculated ages are close to the “real” ages when they range between the values obtained with the EU and LU models. When the samples show signs of uranium-leaching, a realistic mathematical modelling of the age is not possible. On the other hand, some samples have undergone a very late U-uptake “affecting” directly the U-series ages and rendering the calculated ages younger. We present results obtained on two open-air sites, which show the limits of such combined models in the case of late uranium incorporation. For the Middle Pleistocene site of Isernia la Pineta (Italy), the ESR dates are expected to fall within the limits imposed by the Ar–Ar results. The other site, the Lower Palaeolithic deposits of Ambrona (Spain), yielded two sets of samples: some at the top of the sequence with uranium uptake ranging between EU and LU limits and thus giving a good idea of the “real” age of the site; others at the base displaying a very late U-uptake, which render an age determination difficult. |
| Keywords: | ESR-US model Very late uranium uptake Pleistocene Ambrona Isernia la Pineta |
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