石狩湾海水中の懸濁物について
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概要
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The properties and distribution of suspended matter in sea water in the Bay of Ishikari were studied in relation to the phenomena caused by the inflow of Ishikari River into the bay. Oceanographical investigations have been made at twenty-five stations, during the training cruise for students in August 1972 on board the Research Vessel "Bosei Maru" of Tokai University. 51 water samples for study of suspended matter collected from various depths at seventeen stations in Ishikari Bay, and three stations along the Ishikari River, have been examined by means of X-ray diffraction, electronmicroscope and scanning electron-microscope. The concentration of total suspended matter in the surface water of the bay near the river mouth (7 mg/l) was higher than that of river. The horizontal and vertical distribution of suspended matter is not proportional to the salinity of sea water, but seems to be controled by the movement of sea water and the rate of settling of suspended matter. The presence of montmorillonite, chlorite, illite, kaolinite, quartz and feldspar in inorganic suspended matter was confirmed by X-ray diffraction. Kaolinite was detected at all stations; illite, quartz and feldspar at most stations, whereas hydrated halloysite was found only at a few stations. Semi-quantitative analysis of clay minerals indicates that montmorillonite is prevailing in the coastal region and is transported northwards by the current. Illite settle more quickly than chlorite and kaolinite, while chlorite more quickly than kaolinite. About twenty species of diatom identified by means of electron-microscope and scanning electronmicroscope belong to the dominant species of coastal part of northern Japan Sea. These phytoplankton were abundant near the surface where sea water and fresh water are mixed, owing to nutrients brought by the river. In addition fresh water species carried from Ishikari River were also detected off the cape of Ofuyu, about 60 km from the river mouth. In examining the forms of aggregates of clay mineral grains by scanning electron-microscope, some urn-shaped aggregates were observed. They are very similar to " tintinnids" but their true nature remains unsolved.
- 地学団体研究会の論文
- 1977-01-25