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dc.contributor.authorPattan, J.N.
dc.contributor.authorParthiban, G.
dc.date.accessioned2006-10-24T12:06:54Z
dc.date.available2006-10-24T12:06:54Z
dc.date.issued2006
dc.identifier.citationJournal Geological Society Of India, vol.68(4); 605-609pp.
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/453
dc.description.abstractFive buried ferromanganese nodules were recovered at different depths of 167-169 cm (A), 172 174 cm (B), 228 230 cm (C), 328 330 cm (D) and 418 420 cm (E) in a 5 m sediment core from the siliceous sediment of Central Indian Basin (Lat 9°00' S, Long 76°00'E) at a water depth of 5260 m These nodules were analysed for major, trace and rare earth element (REE) concentrations to understand their genesis and compare with the surface and buried nodules in the top 1 m of the sediment column from the same basin Nodules A, B, C arc of an early diagenetic (Mn/Fe ratio between 9 3 and 15 1), nodule D is of hydrogenetic (Mn/Fe ratio 1 6) and nodule E is of diagenetic (Mn/Fe ratio 3 0) origin Total REE concentration ranges between 164 and 497 ppm (av-348 ppm) and is nearly 2 to 3 fold lower than the surface and buried nodules REE are conveyed from the seawater to the nodules in association with a combined phase consisting of Fe - Ti - P The shale (NASC) - normalized REE pattern displays a small convex pattern with a positive Ce-anomaly indicating an oxidized environment while, the presence of positive Eu-anomal) in nodules A, B and C probably suggest an aeolian dust These buried nodules show a moderate middle and heavy REE enrichment (strong in nodules B and C) compared to light REE, but fractionation between middle and heavy REE is not very clear It appears that not much significant post -depositional changes have occurred in these buried nodules
dc.format.extent83411 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherGeological Society of India
dc.rightsThis full-text version of the paper hosted with the permission
dc.subjectferromanganese nodules
dc.subjectCentral Indian Basin
dc.titleComposition and origin of buried ferromanganese nodules from central Indian Ocean
dc.typeJournal Article


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