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Composition and origin of buried ferromanganese nodules from central Indian Ocean

DRS at CSIR-National Institute of Oceanography

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Title Composition and origin of buried ferromanganese nodules from central Indian Ocean
 
Creator Pattan, J.N.
Parthiban, G.
 
Subject ferromanganese nodules
Central Indian Basin
 
Description Five 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
 
Date 2006-10-24T12:06:54Z
2006-10-24T12:06:54Z
2006
 
Type Journal Article
 
Identifier Journal Geological Society Of India, vol.68(4); 605-609pp.
http://drs.nio.org/drs/handle/2264/453
 
Language en
 
Rights This full-text version of the paper hosted with the permission
 
Format 83411 bytes
application/pdf
 
Publisher Geological Society of India