九州北西部伊万里湾・大村湾の底質とCHN組成

概要

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The grain-size parameter, calcium carbonate content and carbon, hydrogen and nitrogen contents of 51 bottom sediment samples obtained from the Imari and Omura Bays, northwestern Kyushu, were determined. The bottom sediments in outside of the Imari Bay chiefly consist of sand with a high content of calcium carbonate of 60.35% in average and a small amount of CHN, 0.83% on the average. On the contrary, the silty sediments were widely distributed in the inside of Imari Bay and have a low content of calcium carbonate of 27.08% and high content of CHN, a 3.10% average. The silty clay and fine silt are the most abundant bay sediments in Omura Bay. These fine-grained sediments have an average of 28.29% of calcium carbonate content and 3.17% of total CHN content, similar to the inside of Imari Bay. The average carbon-nitrogen ratio of the sediment samples from the outside and inside of Imari Bay and Omura Bay are 8.41, 12.30 and 8.90 respectively. A part of the unusual high content of the organic carbon and the high value of carbonnitrogen ratio inside of Imari Bay are from the fine fragments of coal which were discharged from the coal-mines worked along the coast of the Imari Bay up to about twenty years ago.
1980-02-29