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Mineralogical and petrological studies of Jurassic and Cretaceous sediments from southern England and their relevance to radioactive waste disposal

Published online by Cambridge University Press:  05 July 2018

A. E. Milodowski
Affiliation:
British Geological Survey, Nicker Hill, Keyworth, Nottinghamshire NG12 5GG
R. D. Wilmot
Affiliation:
British Geological Survey, Gray's Inn Road, London WCIX 8NG

Abstract

A sequence of sedimentary rocks from the Lower Chalk to the Oxford Clay has been studied as part of a reasearch programme into the feasibility of the disposal of low- and intermediate-level radioactive wastes in argillaceous strata. The preservation of aragonite in such rocks suggests that little groundwater movement has occurred through the bulk of these clays and this would imply that most groundwater movement is likely to occur along any fractures that may be present. Such fractures may interconnect with adjacent aquifer units along which most transport of radionuclides would occur. In these sediments the presence of smectitic clay minerals would strongly influence their retention of radionuclides by sorption and ion-exchange reactions. Compaction, calcite cementation, calcite dissolution and the diagenesis of biogenic silica have influenced the porosity and permeability of the rocks. These processes have also controlled the chemistry of many pore surfaces in contact with groundwater and these in turn will affect groundwater chemistry, and the nature of interactions with transported radionuclides.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1985

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