Multivariate analysis in provenance studies: Cerrillos obsidians case, Peru
We present the preliminary results of a provenance study of obsidians samples from Cerrillos (ca. 800–100 b.c.) using Mössbauer Spectroscopy. The Cerrillos archaeological site, located in the Upper Ica Valley, Peru, is the only Paracas ceremonial center excavated so far. The archaeological data collected suggest the existence of a complex social and economic organization on the south coast of Peru. Provenance research of obsidian provides valuable information about the selection of lithic resources by our ancestors and eventually about the existence of communication routes and exchange networks. We characterized 18 obsidian artifacts samples by Mössbauer spectroscopy from Cerrillos. The spectra, recorded at room temperature using different velocities, are mainly composed of broad asymmetric doublets due to the superposition of at least two quadrupole doublets corresponding to Fe2+ in two different sites (species A and B), one weak Fe3+ doublet (specie C) and magnetic components associated to the presence of small particles of magnetite. Multivariate statistical analysis of the Mössbauer data (hyperfine parameters) allows to defined two main groups of obsidians, reflecting different geographical origins.
KeywordsObsidians Mössbauer spectroscopy Magnetite Cerrillos—Peru
Unable to display preview. Download preview PDF.
- 1.Shackley, M.S. (ed.): Archaeological obsidian studies, pp. 243. Method and Theory, Plenum, New York (1998)Google Scholar
- 2.Brand, R.A.: Normos programs, Angewandte Physik. Univ. Duisburg. Ecole des Mines, Nancy (1995)Google Scholar
- 4.Bustamante, A.D., Petrick, S.C., Scorzelli, R.B., Rossi, A.M., Poupeau, G., Seelenfreund, A.: Hyperfine Interact. (C) 3, 360 (1998)Google Scholar