Record Details

Mineralogy and chemistry of manganese nodules from the Southern part of Carlsberg Ridge

DRS at CSIR-National Institute of Oceanography

View Archive Info
 
 
Field Value
 
Title Mineralogy and chemistry of manganese nodules from the Southern part of Carlsberg Ridge
 
Creator Karisiddaiah, S.M.
 
Subject Geology and Geophysics
ferromanganese nodules
mineralogy
chemistry
ridges
X ray diffraction analysis
ISW, West Indian Ocean
 
Description Petrographic study indicates that the nucleus of nodules is generally composed of clay, volcanic glass, basalt fragments, and earlier nodules. polished sections indicate typical collomorphic globular segregations and partly crystalline oxides of todorokite. Scanning electron micrographs indicate that they are made up of small and large botryoids; and occasional platelets of todorokite, within cavities formed dur to post depositional recrystallization. X-ray diffraction patterns do not show any peaks of todorokite due to poor crystallinity, while ~d-MnO@d2@@ is seen in all the nodules studied. The nodules analysed show: Mn 15.01-21.40%, Fe 10.07-20.10%, Cu 0.07-0.32%, Ni 0.32-0.57%, Co 0.07-0.21%, and also have a Mn/Fe ratio less than 2. The nodules are of hydrogenertic, secondary origin, source being volcanogenic
 
Date 1997-11-28T10:01:06Z
2017-09-29T13:48:25Z
1997-11-28T10:01:06Z
2017-09-29T13:48:25Z
1985
 
Type Journal Article
 
Identifier Journal of the Geological Society of India, vol.26(6); 1985; 402-406
0016-7622
http://drs.nio.org/drs/handle/2264/6341
 
Language en
 
Relation J Geol Soc India
SCI
 
Publisher Geological Society of India