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利用ICP-OES和ICP-MS,分析了麦哲伦海山群西北端MK海山2170 m水深的MKD23B-3号富钴结壳样品,获得了其剖面上Ce,Co和P2O5含量数据。结果显示,该样品未磷酸盐化壳层的过剩Ce(Cexs)与Co含量之间呈明显的正相关关系,相关系数R2高达0.7893;与生长速率呈负相关关系,相关系数R2高达0.7211,表明壳层生长速率是制约结壳Ce含量的主因,高的Ce含量是低的生长速率造成的。在假设海水pH,Mn2+等条件不变的前提下,结壳生长速率正相关于Fe,Mn的沉积通量,而Fe,Mn的沉积通量正相关于海水中溶解氧含量。因此,在海水pH,Mn2+等条件不变的前提下,Cexs负相关于海水中溶解氧含量,海水溶解氧含量只是制约结壳Ce含量的间接因素,纠正了“结壳高Ce异常指示其形成时海水中高溶解氧含量”的认识。
Based on ICP-OES and ICP-MS, the samples of MKD23B-3 cobalt-rich crusts with a depth of 2170 m on the MK seamount at the northwestern tip of the Magellan seamount were analyzed and the data of Ce, Co and P2O5 contents were obtained. The results showed that there was a significant positive correlation between the excess Ce (Cexs) and the Co content in the unphosphated shell, the correlation coefficient R2 was as high as 0.7893, the correlation coefficient R2 was as high as 0.7211 as the growth rate The shell growth rate is the main factor that restricts the Ce content of the crust, and the high Ce content is caused by the low growth rate. Under the assumption of seawater pH, Mn2 + and other conditions remain unchanged, the growth rate of crusts is positively related to the deposition flux of Fe and Mn, while the deposition flux of Fe and Mn is positively related to the dissolved oxygen content in seawater. Therefore, under the condition of seawater pH and Mn2 + constant, Cexs negatively correlated with dissolved oxygen content in seawater and dissolved oxygen content in seawater are only indirect factors restricting Ce content in crust, Formation of high dissolved oxygen in seawater, "the understanding.