Structure of bottom sediments in Lake Hövsgöl: geological and climate controls

A. A. Abzaeva, E. V. Bezrukova, V. A. Bychinsky, S. A. Fedenya, V. F. Geletiy, A. V. Goreglyad, E. V. Ivanov, G. Inoue, T. Kawai, G. V. Kalmychkov, K. Kashiwaya, E. V. Kerber, M. Yu Khomutova, G. K. Khursevich, J. Y. Kim, M. A. Krainov, M. I. Kuzmin, N. V. Kulagina, P. P. Letunova, K. MinouraTs Narantsetseg, Yu V. Osukhovskaya, Ts Oyunchimeg, A. A. Prokopenko, H. Sakai, E. P. Solotchina, L. L. Tkachenko, D. Tomurhuu

研究成果: Article査読

26 被引用数 (Scopus)

抄録

A new experiment of the Hövsgöl Drilling Project was carried out in Lake Hövsgöl in 2004, as part of the international program of scientific drilling in the Baikal Rift. The reported data include a preliminary description of the recovered lake sediments (HDP-04 core), with their compositions and physical properties, and a tentative age-depth model based on the paleomagnetic polarity scale. This is the first evidence that the lithology of sediments deposited for the past ∼1 Myr records periodic alternation of carbonate-free diatomaceous mud and carbonate-bearing silty clay. The diatom intervals in the record are interpreted as corresponding to interglacials by analogy with the periodicity known since the Last Glacial. The core bears signature of at least nine lithological change events. The sediment lithology records extremely low stand of Paleo-Hövsgöl (shallow-water facies produced by erosion of older sediments at the point where the today's lake reaches a depth of 240 m). Correlation of the HDP-04 core data with reflection profiling evidence confirms the presence of quite a large gap in the Pleistocene sedimentary record from the Hövsgöl rift basin. The discovery of alternating carbonate-rich/carbonate-free cycles and evidence for sudden lake level changes impart special importance to the Hövsgöl archive: It can provide a deeper insight into the regional water budget and humidity history than it has been so far possible for the Middle and Late Pleistocene.

本文言語English
ページ(範囲)863-885
ページ数23
ジャーナルRussian Geology and Geophysics
48
11
DOI
出版ステータスPublished - 2007 11
外部発表はい

ASJC Scopus subject areas

  • 地球物理学
  • 地質学

フィンガープリント

「Structure of bottom sediments in Lake Hövsgöl: geological and climate controls」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル