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-P14] New age model of off Takashima drilling sediment

*Yoshio INOUCHI1, Kazuyoshi YAMADA1, Makoto OKAMURA2, Hiromi MATSUOKA2, Yasuhumi SATOGUCHI3, Ryouma HAYASHI3, Fujio KUMON4, Koki MATSUHISA5, Ryousuke OKADA5, Shouhei KAWASHIMA5 (1.Faculty of Human Sciences, Waseda University, 2.Faculty of Science, Kochi University, 3.Lake Biwa Museum, 4.Faculty of Science, Shinshu University, 5.School of Human Sciences, Waseda University)

Keywords:Lake Biwa, sediment, paleoenvironment, age model

Several kinds of studies have been carried out regarding Off Takashima drilling core in Lake Biwa, Japan and a lot of achievements have been reported. In recent years, we have been carrying out chemical analysis on biogenic silica content of cored sediment with high time resolution. However, there have been some age problems regarding uppermost part of the core, namely the last 45 k years. In order to solve the age model problem, we carried out piston core sampling near the Off Takashima drilling site in 2012. About 30 carbon-14 data have been obtained. In addition to well-known wide spread tephra dates, these C-14 dates are converted into new age model. Correlation between Off Takashima drilling core and newly obtained piston core sediment enabled to establish new Off Takashima age model. Last year we reported tentative correlation based on water content profile of both cores. This time, we analyzed grain size, total organic carbon content and total nitrogen content of piston core sediment and compared with those of Off Takashima drilling core. Based on total organic carbon content, correlation between two cores and age model of Off Takashima drilling core are improved greatly.