| Co-Investigator(Kenkyū-buntansha) |
DRIL S.i. Russian Institute of Geochemistry Senior Assistant, 地球化学研究所, 上級職
PEREPELOV A.b. Russian Institute of Geochemistry Senior Assistant, 地球化学研究所, 上級職
KUZMIN M. Russian Institute of Geochemistry Research Fellow, 地球化学研究所, 研究院(所長)
HORIE Shoji Kyoto University, Emeritus Professor, 客員教授 (90025320)
OGURA Kazuko Tokyo Metropolitan University, Associate Professor, 理学部, 助教授 (20087117)
ISHIWATARI Ryoshi Tokyo Metropolitan University, professor, 理学部, 教授 (90087106)
TOYODA Kazuhiro Hokkaido University Associate Professor, 大学院・地球環境科学研究科, 助教授 (10207649)
SAWATARI Hideyuki Nagoya University Assistant professor, 工学部, 助手 (30221287)
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| Research Abstract |
Lake baikal, the biggest lake in the world, is located in the central Siberia. According to the primary survey, it is known that the 5000-10000 m deep sediment may be accumulated in Lake Baikal during last ca.2000 million years. In the present research project entitled "Geochemical Studies on Sediment Core Samples from Lake Baikal", 2 kinds of the 100 m sediment core samples (BDP-93-1, BDP-93-2) collected in 1993 have been analyzed from the viewpoint of inorganic and organic geochemistry. These sediment core samples were taken and distributed under the BDP (Baikal Drilling Project) international cooperative program. Another 300 m sediment core samples was supposed to be drilled in the winter of 1995, but the sampling of the 300 m sediment cores could not be performed because of bad climate conditions and troubles of drilling machines. Fortunately, the 300 m sediment core drilling is now under work and will be distributed in the summer, 1996.
As for the 100 m sediment core samples, about 230 samples taken at each 0.4 m of 102 m long sediment core have been analyzed mainly in terms of the vertical distributions of about 50 elements and carbon/nitrogen ratios. From these results, it is speculated that the upper and lower parts of the sediment core samples, which is divided at about 50 m, have different chemical compositions in both of inorganic and organic constituents. That is, the upper and lower parts consisted of the compositions originated from biogenic and terrestrial activities, respectively, in the past ages. These facts may indicate that Lake Baikal has been a deep-water lake since 50 million years ago and it might be a shallow lake or a land before the age. This findings may help to elucidate the origin of Lake Baikal and long-term geological changes in the Eurasian continent.
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