【摘要】 用铀系法、氨基酸法和锶同位素法对取自东太平洋的数个多金属结核进行了年代测定。在参考其他测年数据并综合地质、气候、环境等资料后， 发现东太平洋多金属的形成与南极底层流有密切关系。大多数结核自渐新世后逐渐生成发育， 早中新世、中中新世及晚上新世是结核发育的最有利时期。多金属结核的生长速率为１０－ ６ ｍ ｍ ／ａ 数量级。由于在不同地质时期受到不同的环境因素的影响， 结核的整个生长发育过程呈阶段性与多变性等特征。更多还原

【Abstract】 The formation ages and the growth rates of polymetallic nodules in the Eastern Pacific were studied using geochronologic methods of uranium series, acemization reaction of aspartic acid and the strotium isotop (\+\{87\}Sr/\+\{86\}Sr) After combining with the information of geology, climate and environment changes, it was concluded that the formation of the manganese nodules was closely related to the Antarctic Bottom Water (ABW) The polymetallic nodules in the East Pacific were gradually formed after Oligocene The main formation stages were Early Miocene, Middle Miocene and Late Pliocene respectively The growth rates of the polymetallic nodules were of the magnitude of 10\+\{-6\} mm/a Affected by the different environment aspects at different time, the growth rates appeared to be of the characteristics of steps and leaps更多还原