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PIXE analysis and fission track dating of obsidian from South American prehispanic cultures (Colombia, Ecuador) |
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| Authors: | L Bellot-Gurlet Th Calligaro O Dorighel J -C Dran G Poupeau J Salomon |
| Affiliation: | a Groupe de Géophysique Nucléaire, CNRS UPRES-A 5025, Université Joseph Fourier, Institut Dolomieu, 15 rue Maurice Gignoux, 38031, Grenoble, France b Laboratoire de Recherche des Musées de France, CNRS UMR 171, 6 rue des Pyramides, 75041 Paris, cedex 01, France c Université de Paris I Sorbonne, Paris, France |
| Abstract: | In the present work we have coupled PIXE with fission track dating to characterise obsidian artefacts from about 40 archaeological sites of Colombia and Ecuador. PIXE analysis, carried out with the external beam line of the AGLAE tandem accelerator, yields the content in about 15 elements with Z > 8, whereas fission track dating is applied to ages in excess of about 10 000 years. About 120 artefacts were investigated by PIXE, of which 50 were dated by fission tracks. Ages and compositions were compared to those of obsidians from all known geological sources of the region. We show that this double characterisation allows us to determine the number of obsidian sources exploited in an ancient past and to give some insight into obsidian circulation. |
| Keywords: | Obsidian Provenience studies PIXE External beam Fission track dating |
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