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Clay mineral reaction progress – the maturity and burial history of the Lias Group of England and Wales

Published online by Cambridge University Press:  09 July 2018

S. J. Kemp ,
R. J. Merriman  and
J. E. Bouch
S. J. Kemp*
Affiliation:
British Geological Survey, Sir Kingsley Dunham Centre, Keyworth, Nottingham NG12 5GG, UK
R. J. Merriman
Affiliation:
British Geological Survey, Sir Kingsley Dunham Centre, Keyworth, Nottingham NG12 5GG, UK
J. E. Bouch
Affiliation:
British Geological Survey, Sir Kingsley Dunham Centre, Keyworth, Nottingham NG12 5GG, UK
*
*E-mail: sjk@bgs.ac.uk
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Abstract

The clay mineral assemblages and microtextures of a suite of mudrocks from the Lias Group of England and Wales indicate important regional differences in burial history.

Samples from the northern Cleveland Basin are characterized by illite-smectite (I-S, 90% illite) and little carbonate whilst samples from the southern Worcester and Wessex basins contain less mature discrete smectite and are often calcite- and dolomite-rich. Lias Group rocks have been buried to 4 km in the Cleveland Basin but to <2 km in the Worcester and Wessex basins. Burial in the Cleveland Basin is deeper than previously estimated and does not need a local heating event. Illite- smectite (80% illite) detected in samples from the East Midlands Shelf suggests burial to 3 km, again deeper than previous estimates for this region.

Keywords

clay diagenesisLias Groupillite-smectitesmectiteXRDSEMTEMsurface areabasin maturity
Type
Research Article
Information
Clay Minerals , Volume 40 , Issue 1 , March 2005 , pp. 43 - 61
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2005

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