HR: 0800h
AN: PP11B-0530    [Abstracts]
TI: Comparison of Meteorological Data and Stable Isotope Time Series from an Indonesian Stalagmite
AU: * Watanabe, Y
EM: yumiko@kueps.kyoto-u.ac.jp
AF: Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto, 606-8502, Japan
AU: Matsuoka, H
AF: Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto, 606-8502, Japan
AU: Sakai, S
AF: Japan Agency for Marine-Earth Science and Technology, 2-15, Natsushima-cho, Yokosuka, Kanagawa, 237-0061, Japan
AU: Ueda, J
AF: Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto, 606-8502, Japan
AU: Yamada, M
AF: Open Research Center, Okayama Univ. of Science, 1-1, Ridai-cho, Okayama, 700-0005, Japan
AU: Ohsawa, S
AF: Institute of Geothermal Sciences, Kyoto Univ., Beppu, 874-0903, Japan
AU: Kiguchi, M
AF: Institute of Industrial Science, Univ. of Tokyo, 4-6-1, Komaba, Meguro-ku, Tokyo, 153-8505, Japan
AU: Satomura, T
AF: Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto, 606-8502, Japan
AU: Nakai, S
AF: Earthquake Research Institute, Univ. of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo, 113-0032, Japan
AU: Brahmantyo, B
AF: Department of Geology, Faculty of Earth Sciences and Mineral Technology, Institut Teknologi Bandung, Jl. Ganesa 10, Bandung, 40132, Indonesia
AU: Maryunani, K A
AF: Department of Geology, Faculty of Earth Sciences and Mineral Technology, Institut Teknologi Bandung, Jl. Ganesa 10, Bandung, 40132, Indonesia
AU: Tagami, T
AF: Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto, 606-8502, Japan
AU: Takemura, K
AF: Institute of Geothermal Sciences, Kyoto Univ., Beppu, 874-0903, Japan
AU: Yoden, S
AF: Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto, 606-8502, Japan
AB: In the last decade, geochemical records in stalagmites have been widely recognized as a powerful tool for the elucidation of paleoclimate/environment of the terrestrial areas. The previous data are mainly reported from middle latitude. However, this study aims at reconstructing past climate variations in the Asian equatorial regions by using oxygen and carbon isotope ratios recorded in Indonesian stalagmites. Especially, we focused on the comparison of meteorological data and stable isotope time series from an Indonesia stalagmite, in order to check whether the geochemistry of stalagmite is influenced by local precipitation. We performed geological surveys in Buniayu limestone caves, Sukabumi, West Java, Indonesia, and collected a series of stalagmites/stalactites and drip water samples. A stalagmite sample was observed using thin sections to identify banding. Moreover, to construct the age model of the stalagmite, we also measured both (1) the number of bands and (2) uranium series disequilibrium ages using the MC-ICP-MS. These data suggest that each layer is annual banding dominantly. Oxygen and carbon isotope ratios were analyzed on the stalagmite for annual time scales. The carbon isotope ratio has a clear correlation with oxygen isotope ratios. Furthermore, the proxy data was compared with meteorological data set in the past 80 years, showing a good correlation between the temporal variation of oxygen/carbon isotope ratios and annual precipitation. These lines of evidence suggest that the isotopic variation is predominantly caused by kinetic mass fractionation driven by the degassing of carbon dioxide in the cave.
DE: 1040 Radiogenic isotope geochemistry
DE: 1041 Stable isotope geochemistry (0454, 4870)
DE: 1105 Quaternary geochronology
DE: 1120 Isotopic disequilibrium dating
DE: 1600 GLOBAL CHANGE
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2007 Fall Meeting