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Sedimentation rates were determined with the 210Pb technique in six sediment cores from Harima Nada (Harima Sound), Seto Inland Sea. The rate of deposition varies from 0.11 g cm-2y-1 in the northern part to 0.33 g cm-2y-1 in, the southern part of the basin. A marked increase in copper and zinc content was observed above a depth in the core corresponding to about 1900 A. D. as a result of increasing human activities. Anthropogenic input of copper and zinc decreased slightly after 1970. Natural background levels of copper and zinc in the sediment in this sound are 11-16 ppm and 100-120 ppm, respectively. The total amounts of anthropogenic. copper and zinc in the sediments were estimated to be 110-180μg cm-2 and 610-1, 280μg cm-2, respectively. These values constitute 40-50 % of the total sedimentary input of copper and zinc in the sediments since about 1900 A. D.
日本海洋学会の論文