A method for coupled ESR/U-series dating of teeth showing post-depositional U-loss |
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| Institution: | 1. Center for the Study of Venoms and Venomous Animals (CEVAP), UNESP – Univ Estadual Paulista, Botucatu, SP, Brazil;2. Botucatu Medical School, UNESP – Univ Estadual Paulista, Botucatu, SP, Brazil;3. College of Agricultural Sciences, UNESP – Univ Estadual Paulista, Botucatu, SP, Brazil;4. Stable Isotopes Center (CIE), UNESP – Univ Estadual Paulista, Botucatu, SP, Brazil;5. College of Veterinary Medicine and Animal Husbandry (FMVZ), UNESP – Univ Estadual Paulista, Botucatu, SP, Brazil;1. University of York, Department of Archaeology, The King''s Manor, York YO1 7EP, UK;2. Istituto di Geologia Ambientale e Geoingegneria, CNR, Rome, Italy;3. Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Rome, Italy;4. Department of History, Culture and Society, University of Rome ‘Tor Vergata’, Via Columbia 1, 00163 Rome, Italy;5. Department of Geoscience, University of Wisconsin-, Madison, USA |
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| Abstract: | An additional method of coupled ESR/U-series dating is developed for teeth showing post-depositional U-loss. The fundamental parameter for the dose rate calculation is the present-day 230Th-activity because of the geochemical immobility of thorium. Uranium and thorium concentrations are measured by thermal ionization mass spectrometry (TIMS). Due to the unknown uranium history an average saturation uptake of uranium is assumed leading to an average development of U-series activities. Therewith an internal dose rate and the age T can be calculated on condition that the modelled 230Th-activity at time T corresponds with the measured value. Using this new method, teeth, found in archaeological sites in France (Gramat, Bramefond), could be dated even though they show U-loss after U-uptake. Two teeth from Gramat could be dated to 128.3±8.6 and 130.5±10 ka. Two teeth from Bramefond have ages of 104.4±8.4 and 115.1±10.2 ka. Both sites can be ascribed to oxygen isotope stage 5. |
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