SEM-EDS characterization of western Mediterranean obsidians and the Neolithic site of A Fuata (Corsica) |
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Authors: | Franç ois-Xavier Le Bourdonnec,Jean-Michel Bontempi,Nathalie Marini,Sylvain Mazet,Pierre Franç ois Neuville,Gé rard Poupeau,Jean Sicurani |
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Affiliation: | 1. Institut de Recherche sur les Archéomatériaux, Centre de Recherche en Physique Appliquée à l''Archéologie, UMR 5060, CNRS-Université Bordeaux 3, Esplanade des Antilles, 33607 Pessac, France;2. Musée Départemental d''Archéologie Jérôme Carcopino, Hameau du Fort de Matra, 20270 Aléria, France;3. Groupe de Recherches Préhistoriques et Protohistoriques, Université de Corse, Caserne Padoue, La Citadelle, 20250 Corte, France;4. UMR 7194, CNRS-Muséum National d''Histoire Naturelle, Département de Préhistoire, Musée de l''Homme, 17 Place du Trocadéro, 75016 Paris, France;5. Université de Corse, CNRS UMR 6240 LISA, Campus Mariani, avenue Jean Nicoli, 20250 Corte, France |
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Abstract: | During the Neolithic, obsidians of the Monte Arci (Sardinia) volcanic complex were by far more used in the northern Tyrrhenian area than those of the three other source-islands (Lipari, Palmarola, Pantelleria) in the western Mediterranean. It is shown that merely determinations of content for six major elements with a scanning electron microscope by energy dispersion spectrometry (SEM-EDS) are sufficient to distinguish the four types of Monte Arci obsidians. Because of the compositional similarities between these obsidian types, a multivariate analysis is recommended in provenance studies. Although SEM-EDS, electron microprobe-wavelength dispersion spectrometry (EMP-WDS) and particle induced X-ray emission (PIXE) give essentially concordant results in the determination of these six element contents, subtle technique-related biases prevent the combination of SEM-EDS, EMP-WDS and PIXE data on source samples for provenance purposes. An SEM-EDS test-study reveals the first occurrence of obsidians of Lipari for the A Fuata Middle to Late Neolithic site of NW Corsica (north of Sardinia), in addition to the usual Monte Arci obsidians. Similar to EMP-WDS, the SEM-EDS technique requires only millimeter-sized fragments. |
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Keywords: | Obsidian Provenance Neolithic Corsica A Fuata |
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