<論文>石狩海盆中央部における堆積速度と堆積環境 (予報) : 1988年望星丸II世のピストンコアによる推定

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The cruise of the R / V "Bosei Maru II" of Tokai University to the Ishikari Basin, off the western coast of Hokkaido, was carried out from 2 to 4 July 1988. The piston coring was performed at the deepest part of the Ishikari Basin (Depth : 807 m, Lat. : 43°45.5'N, Long. : 140°23.1'E). As a result, a core of 485 cm in total length, was obtained without any lost part. This paper presents the general features of the core and its preliminary analyses of sedimentology, micropaleontology and tephrochronology. The core consists mostly of muddy sediment of biogenetic origin, but intercalating thin ash layers. There is a high possibility that these ash layers represent the Aira-Tn ash (22,000 y. B. P.) and the lowest part of the core may indicate date of 32,000 y. B. P.. Therefore, the sedimentary rate of the core is estimated at 15 cm/1,000 years. The foraminifera and diatom fossils were found in the core, and they are indicators of paleoenvironment of the Ishikari Basin.
北海道東海大学の論文
1990-03-20