Manganese deposits are associated with the Neyriz ophiolite colored mélange.
Manganese compounds occurred as small ore deposits with changing grade.
Manganese deposits are found in the form of syngenetic, diagenetic and epigenetic ores.
Biomats besides geochemical data show the important role of the microorganisms in Fe and Mn precipitation.
Fe–Mn biomineralization occurred in the sedimentary oceanic floor environment.