Abstract

New data on the morphology, chemical composition, and age of the ferromanganese crusts of the Doldrums Fracture Zone, Central Atlantic, collected during the 45th cruise of the R/V Akademik Nikolai Strakhov, are presented. According to studies of the chemical composition, the Doldrums crusts are characterized by high concentrations of Fe, Al, Si, and trace elements—Cd, Cr, Li, Hf, Nb, Sb, Sc, Th, W, and V. Most of the crusts have a two-layer structure: the upper layer shows an increased content of detritus and lower concentrations of Mn, Fe, Co, Ni, Cu, and REEs in comparison with the lower layer. The two-layered structure reflects the change in the conditions of crust formation.

中文翻译：

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中大西洋德德拉姆斯断裂带的锰铁结壳：化学成分的新数据

摘要

介绍了在R / V Akademik Nikolai Strakhov的第45趟航行中收集的有关中大西洋Doldrums断裂带的铁锰结壳的形态，化学成分和年龄的新数据。根据化学成分的研究，Doldrums地壳的特征是高浓度的Fe，Al，Si和微量元素-Cd，Cr，Li，Hf，Nb，Sb，Sc，Th，W和V。地壳具有两层结构：与下层相比，上层的碎屑含量增加，而Mn，Fe，Co，Ni，Cu和REE的浓度降低。两层结构反映了地壳形成条件的变化。