Results 181 to 190 of about 2,801 (218)
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The mineralogy of Lake Malawi ferromanganese nodules
Journal of African Earth Sciences (and the Middle East), 1993Abstract In Lake Malawi, ferromanganese nodules and oolites occur in oxic areas at water depths of 80 to 160 m at the facies boundary between sands and muds. In most cases, the nodules have been found at the water/sediment interface. The nodules and micronodules range in colour from dark brown to rusty or yellowish. Some tend to be of metallic lustre
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Chemical Compositon of ferromanganese Nodules from the Southern Ocean.
Australian Journal of Marine and Freshwater Research, 1979Ferromanganese nodules from the Southern Ocean, south-west of Cape Leeuwin, W.A., were chemically analysed for the elements Al, Ag, Ba, Co, Cu, Cr, Cd, Ca, Fe, K, Mo, Ni, Pb, Mg, Mn, Sr, Ti, V and Zn. Preliminary attempts were made to compare the analyses with nodules from other fields in the South Pacific, Atlantic and Indian Oceans.
RW Pettis, A de Forest
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Ferruginous vernadite in an Indian Ocean ferromanganese nodule
Geological Magazine, 1984AbstractSelect area electron diffraction and microanalysis of the optically dark component of a ferromanganese nodule from the South East Indian Ocean Manganese Field indicate that this is composed of a random stratification of crystallites of vernadite MnO2. (R2O, RO, R2O3)x.
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Geochemistry of ferromanganese nodules from the Central Indian Basin
Marine Geology, 1987Abstract The major and minor elements and mineralogical composition of a suite of abyssal ferromanganese nodules from the southwestern and south-central portion of the Central Indian Basin suggest two accretionary processes for the formation of these nodules: (a) hydrogenous precipitation of colloidal metal oxides from seawater; and (b) oxic ...
S.M Ahmad, A Husain
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Environmental Science: Processes & Impacts, 2015
There is renewed interest in the origin and makeup of ferromanganese nodules (FMNs), long known to soil mineralogists as unusual secondary minerals.
Min, Hu +6 more
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There is renewed interest in the origin and makeup of ferromanganese nodules (FMNs), long known to soil mineralogists as unusual secondary minerals.
Min, Hu +6 more
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Composition of ferromanganese nodules from Riga Bay (Baltic Sea)
Oceanology, 2009An average sample of ferromanganese nodules from Riga Bay was investigated by analytical electron microscopy coupled with atomic absorption, neutron activation, and ICP-MS methods. It is established that the nodules consist of colloform and poorly crystallized Fe and Mn hydroxides with an admixture of dispersed inclusions of better crystallized ...
G. N. Baturin, V. T. Dubinchuk
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Iron–manganese banding in Oneida Lake ferromanganese nodules
Nature, 1981Ferromanganese nodules in the deep-sea and in freshwater lakes usually accrete layers rich in manganese oxides alternating with layers rich in iron oxides1. The mechanism producing these alternating layers is unknown; indeed, the mechanism producing the nodules themselves is unknown.
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Biomineral nanostructures of manganese oxides in oceanic ferromanganese nodules
Geology of Ore Deposits, 2008Manganese oxides, which are widespread and of great practical importance, are formed and transformed by the active role of microorganisms. Manganese aggregates occur as both crystallized varieties and disordered fine-grained phases with significant ore grade and up to 50–60 vol % of X-ray amorphous components.
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Prospects for the development of ferromanganese nodules
Актуальные проблемы экономики и управления, 2022Xenia Andreevna Dudkina +1 more
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