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Granulometric analyses of pelites using a sedigraph: Examples from a Volcano-sedimentary environment

DRS at CSIR-National Institute of Oceanography

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Title Granulometric analyses of pelites using a sedigraph: Examples from a Volcano-sedimentary environment
 
Creator Mascarenhas, A.
 
Subject sediments
granulometry
grain size
sedimentary environments
 
Description This article presents granulometric data of pelites (less than 40 microns) of mixed composition from a volcano-sedimentary environment. The sedigraph serves as an useful tool in the analyses of silt-clay fraction of marine sediments. A cumulative curve from 40 to 1 micron can be obtained in 20 minutes. Pelites analysed show wide variations in grain size characteristics with the median value oscillating between 22 and 3 microns. In general, two fine grain size facies, each showing significant variations, are deciphered. Parabolic facies represent coarse silts whereas logarithmic facies comprise medium to fine silts. The type of grain size curves largely depends on the abundance of carbonate and pyroclastic mineral content of individual pelites. As compared to total pelites, their decalcified fractions sometimes show a significant shift of the grain median towards finer sizes. The intricacies of grain size studies of pelites of mixed composition are described in this paper
 
Date 2009-05-06T10:47:03Z
2009-05-06T10:47:03Z
1993
 
Type Journal Article
 
Identifier Journal of the Geological Society of India, Vol.42(4); 392-404p.
http://drs.nio.org/drs/handle/2264/2844
 
Language en
 
Rights Copyright [1993]. 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 Geological Society of India