[MZZ57-05] Origin of ferromanganese nodules in the Minamitorishima EEZ
Keywords:ferromanganese nodules, nuclei, X-ray CT analysis, ICP-MS, Minamitorishima EEZ
In order to explore the promising areas for the future development of the nodules, it is necessary to elucidate their origin. It has long been suggested that large-scale distribution of ferromanganese nodules is coincide with flow channel of deep-sea current [4, 5]. However, origin and its relation to distribution of ferromanganese nodules remain uncertain.
Here, we focus on nuclei of ferromanganese nodules due to the fact that ferromanganese nodules start to grow around nuclei. Characterizing the nuclei of the nodules can, thus, provide important information on the growth initiation of the nodules. In this study, X-ray CT, XRF mapping, and ICP-MS analyses of the nuclei of ferromanganese nodules were performed. The results show that significant part of the nuclei of ferromanganese nodules are derived from seamounts. In the presentation, we will discuss the origin of the nuclei of ferromanganese nodules in the Minamitorishima EEZ and its relation to the growth initiation and distribution of the nodules.
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