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Influence of seamount topography on the local facies variation in ferromanganese deposits in the Indian Ocean

DRS at CSIR-National Institute of Oceanography

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Title Influence of seamount topography on the local facies variation in ferromanganese deposits in the Indian Ocean
 
Creator Mukhopadhyay, R.
Nath, B.N.
 
Subject Geology and Geophysics
concretions
geomorphology
ferromanganese nodules
topography
seamounts
ISW, Indian Ocean
 
Description The morphology and chemistry of ferromanganese nodules and encrustations from a seamount in the Central Indian Ocean Basin show local variations. Nodules from the summit of the seamount have sporadic distribution, are less spherical, have smooth surfaces, have lowest oxide/nucleus (O/N) ratios, and contain low values of Mn/Fe, Ni and Cu. In contrast, nodules from plains at the base of the seamount show greater abundance, are more spherical, have rougher surfaces, register high O/N ratios, and highest Mn/Fe, Ni and Cu. An increase in element concentration (Mn/Fe, Ni%, Cu%) and roughness of nodule surface is directly proportional to the increased thickness of the "acoustically transparent layer". Morphochemical characters of these nodules suggest hydrogenetic and diagenetic formation in the summit and plain areas, respectively
 
Date 1995-06-19T10:01:38Z
2017-09-30T01:29:47Z
1995-06-19T10:01:38Z
2017-09-30T01:29:47Z
1988
 
Type Journal Article
 
Identifier Deep Sea Research, vol.35; 1988; 1431-1436
0198-0149
http://drs.nio.org/drs/handle/2264/7035
 
Language en
 
Relation Deep-Sea Res
SCI
 
Publisher Elsevier