东太平洋海盆430柱沉积物特征与地层

对东太平洋海盆 ４３０ 柱沉积物的组分、古生物、结构构造以及古地磁、铀系等进行研究后， 将沉积物进行分类、命名与分层， 并确定其年代。研究表明， 本柱由下至上的沉积物分别为含沸石粘土、深海粘土、硅质粘土和钙质粘土。该柱中存在 ４ 个沉积间断， 其中在 ３２５ ｃｍ附近层位有一厚约 １０ ｃｍ 的多金属结核层，此界面为中中新世至晚上新世的沉积间断，它在 Ｃ Ｃ区内普遍存在， 持续时间长， 分布范围广。反映此时南极底层流十分强盛， 对东太平洋 Ｃ Ｃ 区的沉积作用和多金属结核形成与发育产生重要的影响。

The characteristic of sediment and its strata of Core 430 from the East Pacific Ocean

The components, fossils, structure, paleomeganetism and uranium series of the sediments of Core 430 were studied, they were also classified, named, stratified and chronicled, which shows that from the bottom up the types of sediments are zeclite|bearing clay, deep|sea clay, siliceous clay and calcareous clay. There are 4 hiatuses in this core. Among them, one hiatus is at the depth of 325 cm, where buried polymetallic nodules about 10 millimeters thick are found. It is occurred from Middle Miocene to Late Pliocene. In C|C (Clarrion and Clipperton )zone, this hiatus is extensively presented. It is reflected that the Antarctic bottom water was strong in this period, which put great effect on both the sedimentation of the East Pacific Ocean and the growth of polymetallic nodules.