Local Marine Reservoir Value （Δ<i>R</i>） of Ie Island, Okinawa and Its Significance

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  • OMOTO Kunio
    Formerly Graduate School of Science and Technology, Nihon University and College of Humanities and Sciences, Nihon University （ret.）
  • NAKAMURA Toshio
    Institute for Space-Earth Environmental Research, Nagoya University
  • MATSUSHIMA Yoshiaki
    Kanagawa Prefectural Museum of Natural History

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Other Title
  • 沖縄県伊江島の海洋リザーバー効果（Δ<i>R</i>）とその意義
  • 沖縄県伊江島の海洋リザーバー効果(ΔR)とその意義
  • オキナワケンイコウトウ ノ カイヨウ リザーバー コウカ(DR)ト ソノ イギ

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Abstract

<p>Along the southern coast of Ie Island, 26 ruins have been excavated. We estimated ΔR value from a series of archaeological charcoal-shell pairs collected from three archaeological sites, located in middle of the southern coast. AMS 14C ages of nine fossil shells and four charcoal samples were used to determine the ΔR values of Ie Island. </p><p>ΔR value calculated for the Nagarabaru-3 shell mound （3,400 cal BP） yielded an age of 250±26 14C yr （n=2）, and a ΔR value determined for Kayabaru site-A （1,300 cal BP） yielded an age of 132±21 14C yr （n=5）. While a ΔR value of Nagarabaru-east shell mound （1,500 cal BP） yielded an age of −38±27 14C yr （n=2）. </p><p> The results of this study indicate a change of ΔR values during the period 3,400～1,300 cal BP with a sudden fall probably occurring at around 1,500 cal BP. Incorporating the above ΔR values into a calibration program, we are able to obtain not only calendar ages on the excavated ruins of Ie Island, but also obtain important information to discuss the geomorphic development of Ie Island based on the re-calibrated ages.</p>

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