• Sedimentary Deposits:
• Manganese Nodules: These are spherical or potato-shaped nodules found on the ocean floor, formed by the slow accretion of manganese and other metals. Manganese Crusts: These are crusts of manganese oxides that form on the surfaces of rocks and seamounts. Sedimentary Ore Deposits: Manganese can be concentrated in sedimentary rocks through various processes, including chemical precipitation, biological activity, and diagenetic alteration.
• Hydrothermal Deposits:
• Manganese-Rich Hydrothermal Vents: These are underwater vents that release hot, mineral-rich fluids, often containing manganese. Manganese-Rich Veins and Deposits: Manganese can be deposited in veins and other deposits associated with hydrothermal activity.
• Weathering and Supergene Enrichment: Manganese-rich rocks can be weathered and eroded, releasing manganese into soils and water bodies. In oxidizing environments, manganese can be concentrated in secondary deposits through supergene enrichment processes.

Dear,

Please contact Prof. Mohamed Rhalmi ([email protected]). He is a specialist in Mn

Best regards

EHC

See my post on your question concerning the Mn parent material and the significance of Eh and pH for the splitting of Fe and Mn in their bivalent state

HGD