HR: 1340h
AN: PP43B-1247    [Abstracts]
TI: Do Strontium Isotope Ratios of Animal Bone and Teeth Really Reflect the Isotope Ratios of its birth- and growth-places?
AU: * Minami, M
EM: minami@nendai.nagoya-u.ac.jp
AU: Goto, A
EM: akigoto@nendai.nagoya-u.ac.jp
AF: Center for Chronological Research, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8602, Japan
AU: Suzuki, K
EM: suzuki@nendai.nagoya-u.ac.jp
AF: Center for Chronological Research, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8602, Japan
AU: Kato, T
EM: kato@nendai.nagoya-u.ac.jp
AF: Center for Chronological Research, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8602, Japan
AU: Watanabe, K
EM: k-watanabe@nucl.nagoya-u.ac.jp
AF: Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464- 8601, Japan
AU: Hasegawa, T
EM: hasegawa@apchem.nagoya-u.ac.jp
AF: Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464- 8601, Japan
AB: Strontium enters the human body through the food chain as nutrients pass from bedrock through soil and water to plants and animals. Strontium substitutes for calcium in the hydroxyapatite mineral of skeletal tissue, and is stored there. ⁸⁷Sr/⁸⁶Sr ratios in an individualfs bone and teeth could directly reflect the isotopic ratios found in the plants and animals that she or he consumed, which reflect the isotope ratios found in the soil and bedrock of that geologic region. Therefore, ⁸⁷Sr/⁸⁶Sr ratios of human skeletons could be useful tools for assessing human residential mobility in prehistory, and many studies on them have been often made. In this study, to evaluate whether the ⁸⁷Sr/⁸⁶Sr ratio of a bone or teeth really reflects the isotopic ratios of its birth and growth places, several bone and teeth samples were measured for ⁸⁷Sr/⁸⁶Sr ratios, compared with ⁸⁷Sr/⁸⁶Sr ratios of geological samples in their growth-places. Bone and teeth samples were leached with 5% acetic acid. After drying, samples were ashed in a muffle furnace at 825°C for 8h, and then digested in nitric acid, followed by cation exchange chromatography with 2.4M hydrochloric acid. ⁸⁷Sr/⁸⁶Sr ratios were measured using a thermal ionization mass Spectrometer (VG Sector 54) or an inductively coupled plasma mass spectrometer (Finnigan ELEMENT2). A modern boar bone collected at Asuke, Toyota City, Aichi prefecture, Japan showed a ⁸⁷Sr/⁸⁶Sr of 0.71001±0.00002 (2 σ), while stream sediments in the Asuke area showed around 0.710 (Asahara et al., 2006). The ⁸⁷Sr/⁸⁶Sr ratio of a modern black bass bone collected from Lake Biwa, Shiga prefecture, Japan was 0.71215±0.00002, while those of surface water in Lake Biwa was 0.71233±0.00002. The similar ⁸⁷Sr/⁸⁶Sr ratios between bone and its provenance geology could indicate that the ⁸⁷Sr/⁸⁶Sr ratios of bones reflect the isotopic ratios of the birth- and growth-places. The more results of modern and fossil skeletons will be shown in our presentation.
DE: 0454 Isotopic composition and chemistry (1041, 4870)
DE: 0793 Biogeochemistry (0412, 0414, 1615, 4805, 4912)
DE: 1055 Organic and biogenic geochemistry
DE: 4870 Stable isotopes (0454, 1041)
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2007 Fall Meeting