在西太平洋边缘海区10余个沉积岩芯的地球化学研究中,我们发现,在有些岩芯的某些层位,特别是岩芯的顶部,锰的含量异常的高.为了描叙这一特征,我们定义K_1为层相对富集系数(本层锰含量/岩芯锰平均含量),定义K_2为层富集系数(本层锰含量/陆架浅海区锰平均含量),并把K_1>2.5,K_2>7.5的层位,称为锰含量异常富集层位. In a geochemical study of more than 10 sedimentary cores in the western Pacific margin, we find that manganese levels are unusually high at some of the core layers, especially at the top of the core. To characterize this feature, We define K 1 as the relative enrichment coefficient of the layer (the content of manganese in this layer / the average content of manganese in the core), define the enrichment coefficient of K 2 (the content of manganese in this layer / the average content of manganese in the shallow shelf of the shelf), and K_1> 2.5, > 7.5 of the horizon, known as the abnormal enrichment of manganese levels.