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Controls on mineral authigenesis in Coal Measures sandstones of the East Midlands, UK

Published online by Cambridge University Press:  09 July 2018

J. M. Hugget
J. M. Hugget*
Affiliation:
BP Petroleum Development Limited, Exploration Department, Britannic House, Moor Lane, London EC2Y 9BU
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Abstract

Authigenic clay mineral formation in fluvial sandstones and one brackish sandstone from the lower and middle Coal Measures of the East Midlands has been studied using XRD, optical microscopy and a variety of electron optical techniques. The sandstones are quartz-rich with minor feldspar and mica. The clay minerals present are kaolinite, chlorite and illite; they form 10–15% by volume of most of the sandstones. Both detrital and authigenic illite and chlorite are present but the kaolinite is entirely authigenic. Kaolinite and illite authi-genesis has been important in all the sandstones but authigenic chlorite is only abundant in the phyllosilicate-rich Silkstone sandstone. The controlling factors in the diagenesis of the sandstones were primary composition, environment of deposition, bed thickness, pore-fluid migration and composition, pressure and temperature. These interacting factors have been of varying importance in time and space in the diagenesis of the sandstones. Authigenic clay morphology appears to have been controlled by time and environment of formation, pore-fluid chemistry and, possibly, parent minerals.

Type
Research Article
Information
Clay Minerals , Volume 19 , Issue 3 , June 1984 , pp. 343 - 357
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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