Bulk stable light isotopic ratios in archaeological birch bark tars |
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| Institution: | 1. Department of Archaeological Sciences, University of Bradford, Richmond Road, Bradford, West Yorkshire BD7 1DP, UK;2. Kulthist Laboratory, Tromsø Museum, University of Tromsø, N-9037 Tromsø, Norway;3. Laboratory of Prehistoric Archaeology, Aristotle University, 546002 Thessaloniki, Greece;1. Université de Strasbourg, CNRS, CHIMIE, UMR 7177, F-67000 Strasbourg, France;2. Inrap Grand-Est Sud, 67100 Strasbourg, France;3. Université de Strasbourg, Université de Haute Alsace, CNRS, ArchIMèdE UMR 7044, F-67000 Strasbourg, France;4. Geologisches Institut, ETH Zürich, Zürich, Switzerland;5. Laboratory of Ion Beam Physics, ETH Zürich, Zürich, Switzerland;6. Université de Strasbourg, CNRS, Laboratoire Image, Ville, Environnement, UMR 7362, F-67000 Strasbourg, France;1. Department of Structural Biology, Weizmann Institute of Science, Rehovot 76100, Israel;2. Department of Organic Chemistry, Weizmann Institute of Science, Rehovot 76100, Israel;1. Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile;2. Sociedad Chilena de Arqueología, El Amacai 505, Las Condes, Santiago, Chile;1. Christopher Ingold Laboratories, University College London, 20 Gordon Street, London WC1H OAJ, UK;2. Department of Biology, Ecology and Earth Science, University of Calabria, via Pietro Bucci, 87036 Arcavacata di Rende, CS, Italy;1. Poznań Archaeological Museum, ul. Wodna 27, 61-781 Poznań, Poland;2. Institute of Archaeology and Ethnology, Polish Academy of Sciences, ul. Rubie? 46, 61-612 Poznań, Poland;1. Departament de Cristal·lografia, Mineralogia i Dipòsits Minerals, Facultat de Geologia, Universitat de Barcelona, Martí i Franquès s/n, E-08028 Barcelona, Spain;2. Département Histoire de l’art et archéologie, Université Michel de Montaigne Bordeaux III, Domaine Universitaire, F-33607 Pessac Cedex, France;3. Museu de Ceràmica la Rajoleta, Puig d’Ossa s/n, E-08950 Esplugues de Llobregat, Spain |
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| Abstract: | The authors report a preliminary study of the light stable isotopic (δD, δ13C and δ18O) values for bulk archaeological birch bark tars, over a geographical (e.g. Greece to Norway) and chronological (9500–3000 BP) range. For δ13C an increase in fractionation with increase in latitude is observed in samples from Greece which are less depleted than those from northern Europe. There is no clear difference between the samples from northern Europe. There is no apparent trend in δ13C value with the 14C age of the sample. Due to biosynthetic fractionation all the samples are significantly depleted in 2H and enriched in 18O relative to the global meteoric water line. This study indicates that archaeological birch bark tar from Greece can be distinguished from those of northern Europe; this separation is probably based on the extreme geographical range of the samples examined here. But this does provide evidence that the birch bark tars were probably made locally rather than traded. |
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