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[D-1.2.2 Research on long-term change of element cycles in ocean based on microfossils and other sediment components]

[Contact Person]

Akira Nishimura
Section Director, Marine Mineral Resources Section,
Marine Geology Department
Geological Survey of Japan
Higashi 1-1-3, Tsukuba, Ibaraki 305 Japan
Phone +81-298-54-3593 Fax +81-298-54-3589

[Total Budget for FY1991-1992]

16,352,000 Yen

[Abstract]

　Southern oceans around Antarctica have been focused as one of the most important areas which control global environmental change through ocean circulation, because Antarctic water is very nutritious and behaves as the source of deep ocean water. Sediment core sequences taken around Antarctica are expected to include a plenty of information of paleoceanographic change including the development of Antarctic glaciers. We analyzed sediment cores from the offing of the South Orkney Islands, the Enderby Land Basin, and the Ross Sea Area. Analysis of sand graln content, water content, microfossil content, magnetic susceptibility are performed. The physical properties of sediments and fossil contents are to be good proxies of ice-rafted supply and productivity in the surface ocean. One core from the Enderby Land area is revealed to be a good core sample for detailed studies for long term environmental change around the Antarctica.

[Key Words]

Antarctic sea, marine sediment, microfossils, flux, productivity