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通过对西太平洋麦哲伦海山区富钴结壳的大尺度细致研究 ,笔者较为深入地探讨了该区结壳的生长与富集特征。研究表明 ,该区结壳自古近纪开始生长 ,生长速率变化范围为 1.5～ 12 .3mm/Ma,速率相差近一个数量级 ,平均生长速率为 3.81m m/Ma;生长过程中成矿元素的地球化学行为呈现明显差异 ;环境发生“骤变”的 O/M界面 ,可能是结壳生长过程中其构造和色泽发生“突变”的一个重要年代 ;成矿元素成分的时序演化主要受控于海水化学和各种不同地质作用的综合影响 ,成矿与非成矿地质作用在生长过程中呈现为互为消长的特征。研究发现 ,该区结壳和太平洋深海粘土元素的分配系数间存在着显著的线性相关关系 ,相关系数为 0 .89,显示它们有相近的元素富集机理。此外 ,笔者还从元素的滞留时间、阳离子的电子键能及其在海水中的水解行为与结壳富集特征间的关系进行了探讨。
Based on the large-scale and meticulous research on the cobalt-rich crusts in the Magellan seamount area in western Pacific Ocean, the author discussed the characteristics of the growth and enrichment of crusts in this area in more depth. The results show that the crusts of the area have been growing since Paleogene, the growth rate varies from 1.5 to 12.3 mm / Ma, the velocities vary nearly one order of magnitude, and the average growth rate is 3.81 mm / Ma. The geochemistry of ore-forming elements The O / M interface with “sudden change” in the environment may be an important period of “mutation” in its structure and color during the growth of crusts. The temporal evolution of ore-forming elemental compositions is mainly controlled by seawater chemistry And a variety of different geological effects of the combined effect of mineralization and non-metallogenic geological processes in the growth process showed the characteristics of each other growth and decline. The study found that there is a significant linear correlation between the crust distribution and the distribution coefficients of clay elements in the Pacific Ocean. The correlation coefficient is 0.89, indicating that they have similar enrichment mechanism. In addition, the author also discusses the relationship between the retention time of the elements, the electron bond energy of the cation and its hydrolytic behavior in seawater and the enrichment of crusts.