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Influence of seabed topography on the distribution of manganese nodules and associated features in the Central Indian Basin: A study based on photographic observations

DRS at CSIR-National Institute of Oceanography

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Title Influence of seabed topography on the distribution of manganese nodules and associated features in the Central Indian Basin: A study based on photographic observations
 
Creator Sharma, R.
Kodagali, V.N.
 
Subject ferromanganese nodules
ocean floor
sediments
topography
distribution
underwater photographs
 
Description The distribution of manganese nodules and associated rock outcrops and sediment cover in the Central Indian Basin (10 degrees-16 degrees S, 73 degrees-82 degrees E), were studied from seabed photographs in relation to topographic features, categorised as the crests of seamounts and abyssal hills, their slopes, valleys and abyssal plains. The nodule coverages are high on the crests and slopes (mean coverage = 12.3 and 15.3%) and low in the valleys and plains (mean coverage = 0.3 and 1.4%). The occurrence of nodules is related to the rock outcrops and sediment cover which are in turn controllEd. by variations in seabed topography; rock outcrops are exposed on crests and slopes, sediment thickness increases from nil on the crests to very thin on the slopes, and from thick to very thick in the plains and valleys. High nodule concentration along the slopes and near the crests of the seamounts and abyssal hills, is a result of the availability of rock fragments as nuclei, which are derived from the rock outcrops. However, areas where nodules are absent are common in all the topographic settings
 
Date 2009-05-06T10:55:50Z
2009-05-06T10:55:50Z
1993
 
Type Journal Article
 
Identifier Marine Geology, Vol.110; 153-162p.
http://drs.nio.org/drs/handle/2264/2876
 
Language en
 
Rights Copyright [1993]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Elsevier