ESR study of thermal history and dating of a stone tool
Electron spin resonance (ESR) of Fe3+ ions and of radiation-induced centers in quartz (E’, peroxy and Al centers) was studied to distinguish between burnt and unburnt stone tools and to determine their age. The yellow stone tool with a reddish edge discovered at the paleolithic site in Kamitakamori, northern Japan, was investigated. The ESR spectrum intensity of Fe3+ ions around g=4.3 and the color of the material changed at 600°C and 240°C, respectively, which indicates that the red part was heated at 240–600°C. The E′ center in the red part was used for dating because isochronal annealing experiments showed low thermal stability of the Al center and overlap of broad signals at g=2.0086 onto the peroxy center. Assuming the same efficiency of defect formation in the red part as of that in the laboratory-heated material at 450°C, the obtained age of 520–770 ka is in concordance with the ages of the tephra layers at the site.
KeywordsElectron Spin Resonance Electron Spin Resonance Spectrum Electron Spin Resonance Signal Stone Tool Electron Spin Resonance Measurement
Unable to display preview. Download preview PDF.
- Ikeya M.: New Applications of Electron Spin Resonance — Dating, Dosimetry and Microiscopy. Singapore: World Scientific 1993.Google Scholar
- Warashina T., Higashimura T., Maeda Y.: Br. Mus. Occ. Pap.19, 117–128 (1981)Google Scholar
- Aitken M.J.: Thermoluminescence Dating. London: Academic Press 1985.Google Scholar
- Griffiths D.R., Seeley N.J., Chandra H., Symons M.C.R.: PACT9, 399–409 (1983)Google Scholar
- Hirooka K., Tanaka A., Yamada A.: Takamori Site III1995, 33–40.Google Scholar
- Toyoda S.: Takamori Site II1993, 53–55.Google Scholar
- Nagatomo T., Uno M., Fujimoto K.: Takamori Site III1995, 17–21.Google Scholar
- Komura K., Yamazaki S. in: Proceedings of Todai International Symposium on Cosmochronology and Isotope Geoscience, pp. 119–122; Todai International Symposium on Cosmochronology and Isotope Geoscience, Tokyo, Japan 1996. Tokyo: University of Tokyo 1996.Google Scholar
- Yokoyama Y., Nguyen H.V.: C. R. Acad. Sci.292(III), 741–744 (1981)Google Scholar
- Hashimoto T., Notoya S., Shirai N.: Takamori Site II1993, 43–51.Google Scholar
- Toyoda S., Ikeya M.: Geochem. J.25, 437–445 (1991)Google Scholar