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利用“大洋一号”调查船在中太平洋不同海区调查时获取的18个富钴结壳样品,采用化学分析及ICP-AES分析法,对中太平洋海区富钴结壳稀土元素的含量、分布特征、配分模式以及来源进行了分析和研究,结果表明:(1)中太平洋海区富钴结壳中稀土元素含量异常高,总量为1703×10-6～2879×10-6,约为正常深海沉积物、有孔虫核壳和海水中稀土元素含量的10～100倍,与莱恩群岛和夏威夷群岛海区结壳中稀土元素的含量接近,且明显高于约翰斯顿岛、马绍尔群岛和南中国海等海区结壳中稀土元素的含量;(2)中太平洋海区富钴结壳中稀土元素的配分模式基本相同,轻稀土元素富集,尤其是Ce元素相当富集,呈较为明显的正异常,而重稀土元素则普遍亏损;(3)中太平洋海区富钴结壳中稀土元素与海水中稀土元素的配分模式为明显的镜像关系;(4)中太平洋海区富钴结壳中稀土元素总量与Mn呈显著正相关,与Mn/Fe相关不明显,反映出研究区结壳中的稀土元素主要来自于海水和上覆水的缓慢沉积以及火山喷发、洋底玄武岩风化淋漓和生物化学沉积。
The 18 cobalt-rich crusts obtained from the investigation of the “Ocean One” survey ship in different sea areas of the Central Pacific Ocean were analyzed by chemical analysis and ICP-AES. The contents of rare earth elements in the cobalt-rich crusts in the central Pacific Ocean, Distribution characteristics, distribution patterns and sources were analyzed and studied. The results show that: (1) The REE contents of the cobalt-rich crusts in the central Pacific Ocean are very high with a total amount of 1703 × 10-6 ~ 2879 × 10-6 The contents of rare earth elements in the normal deep sea sediments, foraminifera nucleus and seawater are 10 ~ 100 times higher than those in the Sea of Ryan and Hawaiian islands, and are significantly higher than those of Johnston Island, Marshall Islands and South China Sea and other sea areas; (2) The REE patterns of the cobalt-rich crusts in the central Pacific Ocean are basically the same, and the light rare earth elements are enriched, especially the Ce elements are quite rich (3) The distribution patterns of rare earth elements in the cobalt-rich crusts of the central Pacific Ocean and seawater are obvious mirror images; (4) The contents of rare earths in the cobalt-rich crusts of the Central Pacific Ocean The total amount of elements and Mn Significant positive correlation was not obvious to Mn / Fe, reflecting the study area rare earth crust mainly from water and slowly deposited overlying water and volcanic eruptions, and the ocean floor basalt weathering dripping biochemical deposition.