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Relationship between size and geochemistry of polymetallic nodules from the Central Indian Ocean Basin: Significance in selection of high grade nodules

DRS at CSIR-National Institute of Oceanography

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Title Relationship between size and geochemistry of polymetallic nodules from the Central Indian Ocean Basin: Significance in selection of high grade nodules
 
Creator Valsangkar, A.B.
Ambre, N.V.
 
Subject ferromanganese nodules
size
geochemistry
mineralogy
mining
economic feasibility
 
Description Morphological, mineralogical and geochemical studies on nodules of different sizes collected from the Central Indian Ocean Basin (CIOB) show two suits of nodule formation by oxic diagenetic and hydrogenous process resulting into distinct properties. The smaller nodules are higher in grade (Cu+Ni+Co%), Mn and Zn contents and suggest their formation at shallower depths by diagenetic process and transportation later to deeper depths. Larger nodules, in contrast, are poor in grade and higher in Fe, Co and moisture contents and indicate their formation at deeper depths by a hydrogenous process. N/n (size of nodule/nucleus) ratios and nucleus size increase with increase in nodule size, supporting the view that smaller and larger nodules were formed differently at different places. Among nodules of other sizes, only medium sized ones of 3-4 and 4-5 cm are higher in grade and their exploitation seems to be economical
 
Date 2009-05-05T05:13:05Z
2009-05-05T05:13:05Z
1994
 
Type Conference Article
 
Identifier Ocean technology: Perspectives, Ed. by: Sushilkumar; Agadi, V.V.; Das, V.K.; Desai, B.N. 827-841p.
http://drs.nio.org/drs/handle/2264/2694
 
Language en
 
Rights Copyright [1994]. 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 Publ. and Inf. Dir., New Delhi, India