Record Details

Internal microfeatures of manganese nodules from the Central Indian Ocean

DRS at CSIR-National Institute of Oceanography

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Title Internal microfeatures of manganese nodules from the Central Indian Ocean
 
Creator Pattan, J.N.
 
Subject Geology and Geophysics
abyssal plains
abyssal hills
microstructure
ferromanganese nodules
ISW, Indian Ocean
 
Description The internal features of manganese nodules from abyssal hills ranging in height from 600 to 880 m and the nodules from abyssal plains in the Central Indian Ocean have been studied. Nodules from the abyssal hills show mainly parallel laminations whereas nodules from the abyssal plains show prominent, well-developed columnar structures. Features such as botryoids and fractures filled with Fe and Mn oxides are more common in the nodules of abyssal plains whereas the clay content and clastic grains are more common in abyssal hill nodules. Compositional studies of layers within the nodules show that Mn, Ni, Cu and Zn increase from the nucleus to the outer layer, while Fe and Co are inclined to decrease. The innermost layer adjacent to the nucleus is hydrogenetic (Mn/Fe ratio of 1.5) and contains phillipsite, quartz and feldspar, while the outer layers are early diagenetic (Mn/Fe ratio of 4.2-5.4) and contain mainly todorokite with minor delta MnO sub(2), phillipsite and quartz. A mixing model shows that the contribution of interstitial water to the outer diagenetic layers was about 75% and that of sea water was about 25%
 
Date 1995-06-19T10:01:38Z
2017-09-30T01:29:47Z
1995-06-19T10:01:38Z
2017-09-30T01:29:47Z
1988
 
Type Journal Article
 
Identifier Marine Geology, vol.81; 1988; 215-226
0025-3227
http://drs.nio.org/drs/handle/2264/7037
 
Language en
 
Relation Mar Geol
SCI
 
Publisher Elsevier