Nature and distribution of manganese nodules from three sediment domains of the Central Indian Basin, Indian Ocean
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Manganese nodules from the Central Indian Basin (5°–10°S) vary in abundance, morphology, mineralogy, and chemistry with water depth and sediment type. Nodules from the southern region, dominated by siliceous sediment, differ markedly from northern and central regions, dominated by terrigenous and terrigenous-siliceous mixed sediments, respectively. Effects of lysocline and sediment diagenesis are envisaged for trace metal enrichment in rough nodules of the southern region. Influence of deep ocean bottom currents have been postulated for the atypical trace metal enrichment of the smooth nodules from other regions. While nodules from other areas of sub-equatorial CIB are grown hydrogenetically, present area nodules show diagenetic influence.
KeywordsNodule Indian Ocean Diagenesis Southern Region Deep Ocean
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- Banakar, V.K. and Borole, D.V., 1987. Growth rate and chemical composition of a nodule from EEZ of Seychelles.Journal Geological Society, India 33:253–258.Google Scholar
- Cronan, D.S. and Moorby, S.A., 1981. Manganese nodules and ferromanganese deposits from the Indian Ocean.Journal Geological Society, London 138:527–529.Google Scholar
- Colley, N.M., Cronan, D.S., and Moorby, S.A., 1979. Some mineralogical studies on newly collected ferromanganese oxide deposits from the North West Indian Ocean. In: La Genes des Nodules de Manganese.C.N.R.S. 289:13–21.Google Scholar
- Gujar, A.R., Nagendernath, B., and Banerjee, R., 1988. Marine minerals—The Indian perspective.Marine Mining 7:317–350.Google Scholar
- karisiddaiah, S.M., 1985. Mineralogy and chemistry of manganese nodules from the southern part of Carlberg Ridge.Journal Geological Society, India 26:401–406.Google Scholar
- Mukhopadhyay, R., 1988. Morphological and geochemical studies of polymetallic nodules from four sectors in the Central Indian Ocean Basin between 11° south and 16° south latitudes. Unpublished Ph.D. Thesis, University of Calcutta, 93 pp.Google Scholar
- Nagendernath, B. and Mudholkar, A.V., 1989. Early diagenetic processes affecting nutrients in the pore waters of Central Indian Ocean cores.Marine Geology 80:57–65.Google Scholar
- Sharma, P. and Somayajulu, B.L.K., 1987. Composition, mineralogy and depositional history of ferromanganese nodules from world oceans. In: Rao, T.S.S., Natarajan, R., Desai, B.N., Narayanswamy, G., and Bhat, S.R. (Eds.), Contributions in Marine Sciences, Dr. S.Z. Qasim sastyabarshapurti felicitation volume. pp. 335–390.Google Scholar
- Udinstev, G.B., 1975. Geological and geophysical atlas of the Indian Ocean. Inter-Governmental Oceanographic Commission, UNESCO, Pergamon, New York, 151 pp.Google Scholar