论文部分内容阅读
对日本海中部、北部和西部四个深水多管沉积岩芯中的~(210)Pb活度和沉积物粒度进行分析。结果显示百年以来大和海脊、日本海北部和西部陆坡沉积物以粉砂和黏土质粉砂为主。在日本海北部和大和海脊表层沉积物存在显著的生物扰动现象,而在西部陆坡不存在。基于恒定供给速率(CRS)模式建立了4个岩芯的年代框架,并计算了沉积速率。日本海现代平均沉积速率介于0.19~0.42 cm/a,最低值出现在大和海脊。4个岩芯中沉积物平均粒径呈现不同的分布模式,但是在1940年和1980年,沉积物粒度分布模式同时发生了改变,这可能与百年以来北太平洋十年涛动(PDO)及东亚夏季风震荡有关。
The ~ (210) Pb activity and sediment particle size in four deepwater multi-tube sedimentary cores in the central, northern, and western Japan were analyzed. The results show that the sediments of the Dahe ridge, the northern part of the Sea of Japan and the western slope have been dominated by silt and clayey silt over a century. There is significant bioturbation in surface sediments in the northern part of the Sea of Japan and the Yamato ridge, but not in the western slope. Based on the constant feed rate (CRS) model, four core age frames were established and the deposition rate was calculated. The average sedimentation rate in the Japan Sea is between 0.19 and 0.42 cm / a, with the lowest value occurring on the Daihei ridge. The average particle size distribution of sediment in four cores shows different distribution patterns. However, in 1940 and 1980, the grain size distribution patterns of sediments changed at the same time. This may be related to the changes in the North Pacific 10-year fluctuation (PDO) and East Asia Summer monsoon related.