open access

https://hdl.handle.net/2115/38464

Paleoceanographic Changes of the Sea of Japan During 3.5-0.8 Ma

英語

Pleistocene

2008

21st Century COE for Neo-Science of Natural History, Hokkaido University

Origin and Evolution of Natural Diversity : Proceedings of the International Symposium, The Origin and Evolution of Natural Diversity, held from 1-5 October 2007 in Sapporo, Japan

187-194

International Symposium, "The Origin and Evolution of Natural Diversity". 1–5 October 2007. Sapporo, Japan.

On the basis of fossil record from marine deposits in and around the Sea of Japan, the environment during 3.5-0.8 Ma is divided into two stages. During the old stage (3.5-1.71 Ma (stage 60/59)), cold surface water prevailed, except for the short term inflow (< 41 ky duration) of warm Tsushima Current at 3.5, 3.2, 2.9, 2.4 and 1.9 Ma. During the young stage (1.71-0.8 Ma), the Tsushima Current flowed into the sea at every interglacial highstand. This change was caused by opening of the southern channel due to crustal stretching in the northern Okinawa Trough. The onset of inflow of the Tsushima Current caused intrusion of warm-water organisms into the Sea of Japan during interglacial stages and barrier to migration of land organisms between East Asia and Japan. In summary, the environments and organisms in and around the Sea of Japan since 3.5 Ma have been strongly controlled by the development of southern channel (1.71 and 1.35 Ma) and global climate changes (glacial/interglacial cycles).

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Version of Record

BA85842508