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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Geology (GG)
Manganese nodules are what type of deposits
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Owishi Sarkar
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The answer is D) chemical. As manganese nodules are formed by chemical precipitation of metallic deposits around a nucleus in a concentric manner.
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Rahul kumar Best Answer
The manganese nodules consist of concentrically banded zones of micro-layers around a nucleus. They form by chemical process of metal precipitation either from the ambient seawater (hydrogenetic) or from pore water in the sediments (diagenetic).
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Saurabh 1![best-answer]()
Well manganese nodules are the deposits that have really very slow forming process and they are mostly confined or most probably found in abyssal zones (deep sea level). They are commonly referred to as the hydrogenous sediments (formed due to ocean water precipitation or ion exchange between ocean water and sediments). The nodule formation sometimes involves Biogenic processes which are required for precipitation of metal hydroxides (done by various microorganisms thriving at such extreme conditions) . Always remember that nodule formation requires low rate of sedimentation , which enables the concretions to grow before they gets buried . Plankton are sometimes come into play and they concentrates trace elements such as copper and nickel. Mn in sea water comes mainly from the hydrothermal vents , leached out usually.