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为了探讨古海洋环境演化对海山富钴结壳稀土元素富集的制约,本次选取西太平洋Lamont海山具有多层结构富钴结壳L1作为研究对象,逐层取样分析研究,认为古海洋环境演化以及磷酸盐化作用对不同稀土元素的影响不同:Ce含量受海洋生产力水平的制约,与形成时古海洋生产力水平呈正相关关系,但受磷酸盐化影响并不显著;而磷酸盐化对富钴结壳中其他稀土元素影响存在明显差异:导致老壳层中稀土元素相对较少,而重稀土元素则相对增加。另外富钴结壳壳层在生成后可能仍然继续与周边海水发生稀土元素交换,导致壳层生成得越早,其重稀土元素相对于其他稀土元素越富集,而Eu则越亏损。
In order to explore the constraints of paleoenvironmental evolution on the enrichment of REE in seamount-rich cobalt-rich crusts, this study selected the multi-layered cobalt-rich crust L1 from Lamont seamount in the western Pacific as the research object and studied the layer-by-layer sampling and analysis, And phosphating have different effects on different rare earth elements. Ce content is restricted by the level of marine productivity and positively correlated with paleocean productivity at the time of formation, but it is not significantly affected by phosphatation. However, There are obvious differences in the influence of other rare earth elements in the crust: the rare earth element in the old shell is relatively less, while the heavy rare earth element is relatively increased. In addition, the cobalt-rich crust shell may still continue to exchange rare earth elements with the surrounding seawater after its formation, leading to the earlier formation of the shell layer. The heavy rare earth elements are enriched relative to other rare earth elements, while the more depleted Eu.