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Factors controlling the distribution of transitional metal elements in marine hydrogenic ferromanganese crusts |
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| Authors: | Xuejun Jiang De Yao Xuehui Lin Shikui Zhai |
| Institution: | 1. College of Geoscience, Ocean University of China. Oingdao 266071, P. R. China;Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266071, P. R. China 2. College of Georesources and Environmental Engineering, Shandong University of Technology, Zibo 255049, P. R. China 3. College of Geoscience, Ocean University of China. Oingdao 266071, P. R. China |
| Abstract: | A series of selective dissolution experiments were conducted on the hydrogemc ferromanganese crusts collected near Line Island to study the geochemistry of Mn, Fe, Cu, Co, Ni and Ti. Despite of the fact that the very close intergrowth between amorphous ferric oxyhydroxides and δ-MnO2 exists in the hydrogenic ferromanganese crusts, there is no isomorphous substitution between iron and manganese. This is because the two elements in oxides have different crystal chemistry and geochemistry, such assertion being in agreement with the results of selective dissolution experiments. Transitional metal elements such as Cu, Co, Ni and Ti are enriched in different phases, i.e. Ni and Co are incorporated into δ-MnO2 while Cu and T1 are incorporated into ferric oxyhy-droxides. The distributions of the elements in amorphous ferric oxyhydroxides and δ-MnO2 are controlled by the existing states of the elements in the seawater and the crystal chemistry and geochenustry of these elements/ions in oxides. |
| Keywords: | hydrogenic ferromanganese crust selective dissolution experiments transitional metal elements distribution |
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