Detailed researches on the growth and enrichment characteristics of Co-rich crusts from the Magellan seamounts in the Western Pacific have been approached in the paper. The studies show that the crusts have been growing since the Paleogene, and that the growth rate varies from 1.5 to 12.3 mm/Ma, showing a difference of almost one order of magnitude between them. The mean growth rate is 3.81 mm/Ma. There are Remarkable differences in the geochemical behaviors of ore-forming elements during the growth. The environmental change around the O/M boundary, which probably corresponds to abrupt changes in the structure, color and luster in profile, hints an important message on the growth age. The temporal evolution of ore-forming elements is mainly controlled by a combined effect of the properties of seawater chemistry and the actions of various geological agents. The minerogenetic and non-minerogenetic processes are closely related and affect each other during the growth. A striking liner relationship between the partition coefficients of Co-rich crusts and pelagic clays is found, illustrating their similar mechanism of element enrichment. Besides, the paper also discusses the relations between the element's mean retention time, the electron binding energies of cations and their hydrolysis in seawater as well as the enrichment of Co-rich crusts.