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Morphological features of Co-rich manganese deposits and their relation to seabed slopes

DRS at CSIR-National Institute of Oceanography

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Title Morphological features of Co-rich manganese deposits and their relation to seabed slopes
 
Creator Yamazaki, T.
Sharma, R.
 
Subject ferromanganese nodules
cobalt
horizontal distribution
bottom topography
mining
 
Description The morphological features associated with Co-rich manganese deposits, the size variations of nodules, and the occurrence of different substrates have been analyzed, to evaluate the influence of various seabed slope angles on the distribution of these features. The coverage and size of the crusts depend on their surface morphology and seabed topography, resulting in cobble-type, lineated, or step-like outcrops. Small nodules (1-4 cm in diameter) dominate all seabed slopes, with a few locations having nodules ranging from 1 to 10 cm. Sediments invariably occur as substrates for nodules and as cover for crusts, their coverage being inversely proportional to that of the nodules and crust outcrops. Steeper seafloor areas have large crust outcrops exposed with no or few nodules and sediments associated with them. The intermediate slopes have a combination of nodules, sediments, and crusts in various proportions, depending on topography and gradient. Large-scale nodule occurrences, followed by sediment fields and crust outcrops on seabed slopes of less than 3 degrees , 3-7 degrees , and greater than 15 degrees, respectively, represent typical morphological distribution zones of the Co-rich manganese deposits on a seamount in the central Pacific Ocean. A transition zone between nodule-dominated fields and large crust outcrops occurs for slopes from 7 degrees to 15 degrees . This detailed study on distribution of Co-rich deposits gives a better understanding for purposes of their exploitation
 
Date 2009-01-09T08:22:29Z
2009-01-09T08:22:29Z
2000
 
Type Journal Article
 
Identifier Marine Georesources and Geotechnology, Vol.18; 43-76p.
http://drs.nio.org/drs/handle/2264/1672
 
Language en
 
Rights Copyright [2000]. 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 Taylor and Francis