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Geochemical trends in the sediments and manganese nodules from a part of the Central Indian Basin

DRS at CSIR-National Institute of Oceanography

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Title Geochemical trends in the sediments and manganese nodules from a part of the Central Indian Basin
 
Creator Banakar, V.K.
Jauhari, P.
 
Subject Geology and Geophysics
Aquatic Non-Resources
sediments
ferromanganese nodules
geochemistry
rare earths
ISW, Central Indian Ocean Basin
 
Description Geochemical analyses of eighteen surface sediments samples collected from an area between 1 degree-15 degrees S latitudes and 73 degrees-87 degrees E longitudes exhibit significant variation in their chemical composition. Distribution patterns of the major and minor elements suggest a probable removal of a portion of Fe, Ti, Mg and Cr along with major portions of Mn, Ni, Cu and Zn as authigenic ferro-manganese colloids to the sediments. The rare earth elements (REE) exhibit nearly an order of magnitude enrichment in the nodules compared to the surrounding sediments. The positive Ce anomaly in the Nodules ( 0.25) is associated with negative Ce anomaly (0.04) in the host sediment indicating its oxidative scavenging preferentially by Fe-hydroxide colloidal flocs incorporating into the nodules. The shale (NASC) normalised patterns and end member ratios of REE indicate middle REE(MREE) enrichment over light REE(LREE) and heavy REE(HREE) in both nodules and sediments. The preferential uptake sequence of REE in the nodules could be given as MREE > LREE > HREE
 
Date 1994-05-16T10:06:26Z
2017-09-30T01:55:41Z
1994-05-16T10:06:26Z
2017-09-30T01:55:41Z
1994
 
Type Journal Article
 
Identifier Journal of the Geological Society of India, vol.43(5); 1994; 591-598
0016-7622
http://drs.nio.org/drs/handle/2264/7369
 
Language en
 
Relation J Geol Soc India
SCI
 
Publisher Geological Society of India