Table 1. Composition of manganese crusts from the Atlantis Fracture Zone

Summaries of the transition element chemistry of oceanic ferro-manganese deposits report compositional trends related to water depth and to geographic proximity to continental margins1-4. Explanations of compositional variations include continental source influence3, 5, 6, diagenetic environmental control of manganese mineralogy that regulates the trace metal composition1, 3, 7, ionic mobility in interstitial solutions during diagenesis3, 8-10, and volcanic or hydrothermal influence3, 11-14. Glasby15 rejects a significant pressure control on manganese oxide mineralogy on thermodynamic grounds.海洋铁锰矿床（ferro-manganese deposits）的过渡元素（transition element）化学研究总结，阐述了与水深及距大陆边缘空间邻近性相关的组分变化趋势1-4。针对组分变异的成因解释涵盖：大陆物源影响3,5,6；调控微量金属组成的锰矿物学成岩环境控制机制1,3,7；成岩作用过程中孔隙溶液内的离子迁移行为3,8-10；以及火山或热液（hydrothermal）活动影响3,11-14。格拉斯比（Glasby）15基于热力学原理，否定了压力对氧化锰矿物学特征存在显著控制作用的观点。