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Some chemical data on British Carboniferous sediments and their relationship to the clay mineralogy of these rocks

Published online by Cambridge University Press:  14 March 2018

G. D. Nicholls  and
D. H. Loring
G. D. Nicholls
Affiliation:
Department of Geology, University of Manchester
D. H. Loring
Affiliation:
Department of Geology, University of Manchester
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Abstract

Analyses of shales, mudstones and associated strata from the British Coal Measures reflect the general similarity of the clay mineralogy of the rocks studied. Variations in the Na+:K+ ratio appear to be due to variations in the Na+:K+ ratio in illite. It is suggested that degraded illite supplied to the site of sedimentation had a higher Na+:K+ ratio than the illite now present in the shales and that post-depositional changes have caused a fall in this ratio. Under conditions of rapid sedimentation such changes tend to be inhibited by rapid burial. In the seat earths, produced by very slow sedimentation, post-depositional changes continued to an advanced stage and resulted in low Na+:K+ ratio in the final sedimentary rock.

Type
Research Article
Information
Clay Minerals Bulletin , Volume 4 , Issue 24 , December 1960 , pp. 196 - 207
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1960

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