What is the speciality of manganese in terms of biogeochemical role that causes this very element to be chiefly concentated into nodues? It is not among top 10 most abundant elements on earth surface, right?
Is it due to some serendipitious redox potential and solubility of manganese, presense of some microbes, or any strongt selective cxhelating agents?
The Mn/ Fe ratio is not a constant one and strongly depends on the origin and source of
ore- forming fluids
•Classification of manganese nodules of deepmarine environments
•(1) hydrogenous, i.e., formed due to slow deposition of metals out of sea water and characterized bya high concentration of base metals and varying Mn/Fe rations (from 0.5-5)
•(2) hydrothermal, i.e., rich in iron and depleted of other metals, and turns out to be having an extremely wide range of Mn/Fe rations, near mid-ocean ridges and rift systems
•(3) diagenetic, i.e., characterized byhigh Mn/Fe ratios and relatively low concentration of base metals, halmyrolitic processes
•Origin:
•Oceanic nodules may be formed from the ore material of polygenic origin, with a predominant role of hydrothermal sources. Manganese nodules may grow due to a supply from oceanic water and out of host sediments. Ore control strong redox changes
HGD
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