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The formation of todorokite and birnessite in sea water pumped from under ground
Authors:N Takematsu  Y Sato  S Okabe
Institution:The Institute of Physical and Chemical Research, Wako-shi, Saitama 351, Japan;The Faculty of Marine Science and Technology, Tokai University, Shimizu-shi, Shizuoka 424, Japan
Abstract:Manganese oxides precipitated from aerated well sea water at the Marine Science Museum, Tokai University, have been analyzed chemically and mineralogically. The OMn ratios are lower in todorokite than in birnessite but these minerals have similar contents of minor transition metals, which can be taken up additionally from sea water after the precipitation of Mn oxides. On the basis of these results, the genesis of Mn minerals is discussed in relation to marine Mn nodules.
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