【摘要】 根据东太平洋海盆ＰＣ５７９４柱状样１４７—６９５ｃｍ（早中新世早期）的氧同位素、生物ＣａＣＯ３、古温度及成矿元素等的研究结果表明，该区早中新世早期沉积物的δ１８Ｏ大致可分为五组，所反映的气候变化存在三个暖期和二个冷期的冷暖交替。氧同位素与生物ＣａＣＯ３呈正相关关系；无生物ＣａＣＯ３条件下的成矿元素与古温度的变化趋势具三种情况：Ｍｎ、Ｆｅ、Ｃｏ含量变化趋势与古温度呈正比；Ｃｕ含量与古温度呈反比；Ｎｉ介于上述两种类型之间。ＰＣ５７９４早中新世早期的硅钙质软泥与钙硅质软泥为寒冷气候下的沉积物，有利于沉积型多金属结核的形成更多还原

【Abstract】 According to the study of PC 5794 columnar sample (147-695cm, early period of Early Miocene) from East Pacific Basin in such aspects as oxygen isotopes, biogenic CaCO3, paleotemperature and ore-forming elements, the region had the following features in the early period of Early Miocene: δ18O values of sediments might be roughly divided into five groups; paleoclimate experienced cold-warm alternations composed at least of three warm periods and two cold (ice) periods; oxygen isotopes were in direct correlation with biogenic CaCO3; Mn、Fe、Co、Ni were in negative correlation with δ18O values but Cu in direct correlation with paleotemperature.更多还原