Japan Geoscience Union Meeting 2014

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Symbol H (Human Geosciences) » H-TT Technology & Techniques

[H-TT35_1AM1] Developments and applications of AMS techniques for earth and human environmental research

Thu. May 1, 2014 9:00 AM - 10:45 AM 311 (3F)

Convener:*Toshio Nakamura(Center for Chronological Research, Nagoya University), Hiroyuki Matsuzaki(School of Engineering, The University of Tokyo), Kimikazu Sasa(Research Facility Center for Science and Technology, University of Tsukuba), Hisao Nagai(Faculty of humanities and Sciences, Nihon University), Masayo Minami(Center for Chronological Resarch, Nagoya University), Chair:Kimikazu Sasa(Faculty of Pure and Applied Sciences, University of Tsukuba)

10:30 AM - 10:45 AM

[HTT35-07] AMS radiocarbon dating of tephra layers on Adak Island, central Aleutian

*Mitsuru OKUNO1, Toshio NAKAMURA2 (1.Fac. Sci., Fukuoka Univ., 2.CCR, Nagoya Univ.)

Keywords:Adak Island, Holocene, tephra, radiocarbon date

The Holocene tephra layers distribute on Adak Island located in the central part of the Aleutian Islands. Radiocarbon (^ {14} C) age determination of charcoal fragments in the soil layer has been performed. Moreover, tephra is intercalated with sand layer of dune. Since sand dune has high depositional rate and low contamination of organic matter, a possibility of polluted charcoal sample from below and above tephra is low. Thus reliable age was able to be obtained by the AMS method to these small samples. We report those results.