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Manganese nodule distribution in different topographic domains of the central Indian Basin

DRS at CSIR-National Institute of Oceanography

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Title Manganese nodule distribution in different topographic domains of the central Indian Basin
 
Creator Kodagali, V.N.
Sudhakar, M.
 
Subject ferromanganese nodules
distribution
topography
geochemistry
abundance
 
Description Manganese nodule distribution is primarily influencEd. by seafloor topography. Nodule distribution at 479 locations vis-a-vis seabed topography is studiEd. by superimposing sampling location on the topographic profile and assigning appropriate domain (hilltop, valley, slope, or plain) for the sampling location. Highest mean abundance is observed at the valleys (6.94 kg/m sup(2), followEd. by hilltops, slopes, and least on plains. Frequency distributions are regular (Gaussian) on plains, whereas on valleys and hilltops they are irregular (Rayleigh type). Fe and Co content is highest in nodules from hilltops and lowest in those from plains. Conversely, Mn, Cu, and Ni content is highest on plains and least on valleys. Fe: Mn and Co: Mn are negatively correlated in all the domains. Mn and total metal content (Ni + Cu + Co) show direct relationship in all the domains. An inverse relation between nodule abundance and composition is found. Cluster analysis on chemical and abundance data shows two distinct groups in all domains. Abundance and Fe and Co content typically form one group, while all other elements form another group. Genesis of nodules depends on the availability of supply of transition elements to the abyssal environment, maintenance of nodules in the sediment-water interface, and sedimentation rates
 
Date 2009-05-06T10:47:03Z
2009-05-06T10:47:03Z
1993
 
Type Journal Article
 
Identifier Marine Georesources and Geotechnology, Vol.11; 293-309p.
http://drs.nio.org/drs/handle/2264/2845
 
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 Taylor and Francis