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dc.contributor.authorValsangkar, A.B.
dc.contributor.authorKhadge, N.H.
dc.date.accessioned1995-06-24T10:01:50Z
dc.date.accessioned2017-09-30T01:29:59Z
dc.date.available1995-06-24T10:01:50Z
dc.date.available2017-09-30T01:29:59Z
dc.date.issued1989
dc.identifier.citationMarine Mining, vol.8(3); 1989; 325-347
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/7288
dc.description.abstractFerromanganese nodules collected during the 13th cruise of the M.V. Skandi Surveyor in 1987 cover a very large area, 71 424 km super(2) in the Central Indian Ocean. The area consists of 13 nodule types, which are grouped into six size classes. Morphology indicates that spheroidal and ellipsoidal nodules of rough type (Sr) belonging to classes 1 ( 2 cm) and 2 (2-4 cm) are more abundant. The concentration of Mn, Fe, Cu, Ni, and Co in 84 samples varies inversely with size class and only class 1 and 2 nodules are found to be enriched in Mn, Cu, Ni, and Co. Excellent correlations are observed between Mn with Cu and Ni and Fe with Co, whereas Mn and Fe behave inversely in all the size classes. The estimated growth rates are inversely related to size and suggest that the smaller nodules of classes 1 and 2 grow rapidly because of an additional source of the transitional elements. Mineralogy of 36 different size nodules shows decreasing abundance of todorokite with increase in size. Systematic compositional variation observed between the six nodule classes is related to the morphology, mineralogy, and contribution of biogenic matter. The nodules of classes 1 and 2 have a higher grade ( 2.47% of Cu + Ni + Co) and a higher percentage of abundance relative to the nodules of other classes. The study also implies the importance of selection of size parameter when designing the nodule collector
dc.languageen
dc.relation.ispartofMar Mining
dc.relation.isreferencedbySCI
dc.subjectGeology and Geophysics
dc.subject.othermineralogy
dc.subject.othercorrelation
dc.subject.othersize
dc.subject.otherferromanganese nodules
dc.subject.othergeochemistry
dc.subject.otherISW, Central Indian Ocean
dc.titleSize analyses and geochemistry of ferromanganese nodules from the Central Indian Ocean Basin
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India


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