Japan Geoscience Union Meeting 2014

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Poster

Symbol M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS30_28PO1] Paleoclimatology and paleoceanography

Mon. Apr 28, 2014 6:15 PM - 7:30 PM Poster (3F)

Convener:*Yamada Kazuyoshi(School of Human Sciences, Waseda University), Minoru Ikehara(Center for Advanced Marine Core Research, Kochi University), Tomohisa Irino Tomohisa(Faculty of Environmental Earth Science, Hokkaido University), Yusuke Okazaki(Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University), Ikuko Kitaba(Kobe University Research Center For Inland Seas), Akihisa Kitamura(Institute of Geosciences, Faculty of Science, Shizuoka University), Masaki Sano(Research Institute for Humanity and Nature), Ryuji Tada(Department of Earth and Planetary Science, Graduate School of Science, The Univeristy of Tokyo), Masakazu Yoshimori(Atmosphere and Ocean Research Institute, University of Tokyo)

6:15 PM - 7:30 PM

[MIS30-P13] Observation of stalagmite laminae for paleoclimate reconstruction at Taga Mine Cave, Shiga Prefecture, Japan

*Ryo HISAMOCHI1, Yumiko WATANABE1, Yuji ABE2, Takahiro TAGAMI1 (1.Graduate School of Science, Kyoto University, 2.Taga Town Museum)

Keywords:stalagmite, laminae, paleoclimate

A lot of studies on paleoclimate reconstruction using stalagmites have been done all over the world. However, there are only a few stalagmite paleoclimate researches in Japan. In this study, we observe laminae of stalagmites collected at Taga Mine Cave, Shiga Prefecture, Japan (TAGA3,TAGA5,TAGA7,TAGA11,TAGA12) for paleoclimate reconstruction. Stalagmite paleoclimate reconstruction has a potential to get high-resolution (anuual~decadal) age proxy data, if stalagmite samples have anuual laminae. However, some stalagmites have a few types of laminae within a sample (Baker et.al,2008). In this case, it is important to elucidate which types of laminae is anuual. When we observe the thin section of our samples by microscope, all samples show laminae. These laminae consist of natural organic matters because of fluorescent by UV excitation (Baker et.al,2008). Laminae interval is variable from several μm to a few hundred μm. Laminae of our samples are similar to the one from China and Turkey (Tan et.al,2006 , Baker et.al,2008). Especially, sample TAGA3 has more obvious laminae than the other samples, but has the laminae which looks like sub-annual or supra-annual laminae reported in China (Tan et.al,2006). In addition, laminae are wavy in some parts of TAGA3. If we can distinguish annual laminae by U-Th age and find the feature of annual laminae, we will get high-resolution paleoclimate proxy data.