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dc.contributor.authorKarisiddaiah, S.M.
dc.date.accessioned1997-11-28T10:01:06Z
dc.date.accessioned2017-09-29T13:48:25Z
dc.date.available1997-11-28T10:01:06Z
dc.date.available2017-09-29T13:48:25Z
dc.date.issued1985
dc.identifier.citationJournal of the Geological Society of India, vol.26(6); 1985; 402-406
dc.identifier.issn0016-7622
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/6341
dc.description.abstractPetrographic study indicates that the nucleus of nodules is generally composed of clay, volcanic glass, basalt fragments, and earlier nodules. polished sections indicate typical collomorphic globular segregations and partly crystalline oxides of todorokite. Scanning electron micrographs indicate that they are made up of small and large botryoids; and occasional platelets of todorokite, within cavities formed dur to post depositional recrystallization. X-ray diffraction patterns do not show any peaks of todorokite due to poor crystallinity, while ~d-MnO@d2@@ is seen in all the nodules studied. The nodules analysed show: Mn 15.01-21.40%, Fe 10.07-20.10%, Cu 0.07-0.32%, Ni 0.32-0.57%, Co 0.07-0.21%, and also have a Mn/Fe ratio less than 2. The nodules are of hydrogenertic, secondary origin, source being volcanogenic
dc.languageen
dc.publisherGeological Society of India
dc.relation.ispartofJ Geol Soc India
dc.relation.isreferencedbySCI
dc.subjectGeology and Geophysics
dc.subject.otherferromanganese nodules
dc.subject.othermineralogy
dc.subject.otherchemistry
dc.subject.otherridges
dc.subject.otherX ray diffraction analysis
dc.subject.otherISW, West Indian Ocean
dc.titleMineralogy and chemistry of manganese nodules from the Southern part of Carlsberg Ridge
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India


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