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chang jiang kou ji lin jin lu jia xian dai chen ji wu gou zao
Author(s): Cheng Goudong Qian Jiangchu Charles A. Nittrouer, David J. DeMaster, and Brent A. Mckee
Pages: 1-
15
Year: 1985
Issue:
2
Journal: Marine Geology & Quaternary Geology
Keyword: 陆架; 现代沉积物; 长江口; 堆积速率; 混合作用; 层理; 济州岛; 水下三角洲; 作用区; 第四纪地质;
Abstract: <正> 泥沙颗粒从水介质中沉积到海底后,并不是简单的在加积过程中压实保存,而是经历了物理和生物因素的扰动,然后随着纯沉积的进展,质点从扰动层的底部转为稳定的保留层.因而,海底沉积物在垂向上可分为两带,即上部的混合带和其下部的堆积带,在混合带内,颗粒质点受生物和物理作用而处于运动状态,形成混合层.颗粒在沉积物中活动的时间称为滞留时间T,T=L/A.L为混合层厚度,A为堆积速率,T值大,滞留时间长,混合作用强;T值小,混合作用弱.
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