【摘要】 根据对取自东北太平洋"克拉里昂"和"克里帕顿"两断裂带之间的430号柱状岩芯的多学科的综合分析结果,发现该岩芯中至少存在四个比较明显的沉积间断。这四个沉积间断分别处于岩芯的表层、28cm、215cm和320cm处,其年代分别为全新世、中更新世、上上新世和中中新世-上上新世。南极底层流的发育则是造成上述沉积间断的主要原因。在该柱状岩芯中,除了在其表层有多金属结核外,另外还在其28cm处和320cm处发现有埋藏结核层,这三层结核的形态、矿物及年代等诸方面虽有差异,但它们均先后形成于该岩芯中的320cm处、其起始年代为距今1.2×10~7a的那个大的沉积间断中。更多还原

【Abstract】 According to the results of multidisciplinary analyses with different methods,we found that there were at least four hiatuses in a sediment core taken from CC Zone in North Pacific.These hiatuses are as follows:Holocene,Middle Pleistocene,Upper Pliocene and Middle Miocene.The main cause of these hiatuses is the Antactic Bottom Water(AABW). There were three layers of polymetallic nodules in this sediment core.They were the surface nodules,the buried nodules in the depth of 28cm and 320cm in the core respectively.These nodules were different in the size,chemical composition,mineral phases and age,but the origin of these nodules were all related to the hiatus in 320cm of the core which began at 1.2×10~7a BP.更多还原