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Distribution of grain size and clay minerals in sediments from the INDEX area, central Indian Basin

DRS at CSIR-National Institute of Oceanography

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Title Distribution of grain size and clay minerals in sediments from the INDEX area, central Indian Basin
 
Creator Valsangkar, A.B.
Ambre, N.V.
 
Subject sediments
granulometry
grain size
clay minerals
lithology
particle size
mineralogy
 
Description The granulometry of 21 box core sediments from five selected sites in the Central Indian Basin (CIB) have been studied to understand the sediment size characteristics in the Pioneer area before the benthic disturbance experiment. The sediments are predominantly clayey silt. Statistical parameters were determined to understand the control and variations in the grain size. The mean grain size (M sub(2) phi) ranged from 7.0 to 8.6 for the surface and from 6.6 to 8.6 for the subsurface sediments, indicating deposition of very fine fractions during the Neogene period. The sediments were poorly sorted as revealed from the higher sigma sub(1) values (2.7 to 2.9). Higher and negative values of skewness (SK sub(1)) indicated a winnowing action of prevailing currents in the area. Average kurtosis (K sub(G)) values for the surface (0.4 to 0.8) and subsurface (0.5 to 1.2) showed that sediments were very platykurtic and leptokurtic. Clay mineralogical studies showed that smectite had a wider range (from 6% to 55%) and decreased southward because of its terrigenous origin. The terrigenous influence of the sediments could be documented as far as 12 degrees S. Smectite and kaolinite increased eastward and chlorite decreased southward. This observation positively correlated with the mean current direction in the area. However, the influence of Antarctic Bottom Water (AABW) in the area could be predicted from the southward increase in chlorite content
 
Date 2009-01-09T08:08:12Z
2009-01-09T08:08:12Z
2000
 
Type Journal Article
 
Identifier Marine Georesources and Geotechnology, Vol.18; 189-199p.
http://drs.nio.org/drs/handle/2264/1649
 
Language en
 
Rights Copyright [2000]. 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