摘要
杭州湾南岸潮滩的^(210)Pb垂向分布具有随深度波动的特征。湖滩颗粒物在吸附模拟系统中的^(210)Pb分配系数,主要受颗粒物含量的影响。本文从潮滩沉积^(210)Pb初始比度在低于平衡点一侧波动的机理,以及被沉积间断所分隔的有效封闭段的存在出发,提出选择常态沉积层的高^(210)Pb比度窗口,建立以CIC模式估计潮滩沉积速率的方法。
Fluctuations feature the 210Pb distribution in tidal flat sediments along the southern Hangzhou Bay. Lower activity in the surface and zig-zag alternation of activity have been found in its verticle profiles. And variation of 210Pb activity has also been detected along the transect from river to sea. An adsorption experiment for 210Po in geochemic setting similar to the Hangzhou Bay suggests that suspended sediment concentration dominates on partition of trace metals in the Hangzhou Bay. It is discussed that the initial 210Pb activity in tidal flat is out of balance but fluctuates in a range below the balance level. The discussion also deals with the closed sections kept apart by sedimetation disturance. Therefore, a method for estimatint tidal flat sedimentation rate by CIC. model, characterized by using the normal deposit windows with higher ^(210)Pb activity, is recommended and tasted.
出处
《东海海洋》
1993年第1期34-43,共10页
Donghai Marine Science
基金
中荷潮滩沉积作用研究合作项目成果之一
关键词
杭州湾
潮滩
沉积学
铅同位素
Hangzhou Bay, tidal flat, ^(210)Pb, sedimentology
