Japan Geoscience Union Meeting 2016

Presentation information


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

[M-IS17] Paleoclimatology and paleoceanography

Mon. May 23, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Tomohisa Irino(Faculty of Environmental Earth Science, Hokkaido University), Minoru Ikehara(Center for Advanced Marine Core Research, Kochi University), Akira Oka(Atmosphere and Ocean Research Institute, The University of Tokyo), Yusuke Okazaki(Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University), Ikuko Kitaba(Research Centre for Palaleoclimatology, Ritsumeikan University), 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), Takeshi Nakagawa(Ritsumeikan University), Akira Hayashida(Department of Environmental Systems Science, Doshisha University)

5:15 PM - 6:30 PM

[MIS17-P12] Coupled oxygen isotope records of inclusion water and carbonate from a stalagmite in Hoshino Cave, Okinawa

*Ryu Uemura1, Satoru Mishima1, Kanako Oomine1, Ryuji Asami1, Chen Jin-Ping2, Chuan-Chou Shen2 (1.University of the Ryukyus, 2.Dept. of Geosci., National Taiwan University)

Keywords:speleothem, stalagmite, isotope, fluid inclusion

Millennial scale abrupt climate changes have been occurred during the last deglaciation. However, the land climate change in Japan is unclear due to sparsity of the high-time resolution paleoclimate record. In this study, we have measured isotope ratios of fluid inclusions and the calcium carbonate of a speleothem in a subtropical island. A stalagmite sample (HSN2), which was broken during a construction work of tourist corridor, was collected in Hoshino cave at Minami Daito Island, Okinawa Prefecture. Isotope ratios of the fluid inclusions were measured using the CRDS-based isotope measurement system. The analytical method was based on Uemura et al. (GCA, 2016), but the most of processes has been automated. The stalagmite covers the last deglaciation period (13-21 kyr). Water content of the stalagmite significantly differs in each layers. The water content correlates with the pattern of stripes of the cross section of the sample. There are weak correlation between the oxygen isotope ratio of the fluid inclusions and that of calcium carbonate.