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Clay mineralogical variations and evolutions in sandstone sequences near a coal seam and shales in the Westphalian of the Campine Basin (NE Belgium)

Published online by Cambridge University Press:  09 July 2018

I. Van Keer
Affiliation:
Fysico-chemische geologie, K.U. Leuven, Celestijnenlaan 200C, B-3001 Heverlee, Belgium
Ph. Muchez
Affiliation:
Fysico-chemische geologie, K.U. Leuven, Celestijnenlaan 200C, B-3001 Heverlee, Belgium
W. Viaene
Affiliation:
Fysico-chemische geologie, K.U. Leuven, Celestijnenlaan 200C, B-3001 Heverlee, Belgium

Abstract

Mineralogical trends have been investigated on a detailed scale in two Westphalian fluvial sandstone sequences in contact with either a coal seam or shales. The evolution in an authigenic clay mineral assemblage can be related to changes in the pH of the pore-water. Firstly, kaolinite formed early in diagenesis, mainly as a result of K-feldspar dissolution and alteration. This process, which took place under acidic conditions, consumed protons. Subsequently the pH of the pore-water increased and after compaction, illitization of kaolinite occurred under near neutral conditions. Deep burial is marked by dickite formation, which again reflects acidic conditions. Distribution of clay minerals is related to meteoric water flux through the sediments and the release of organic acids and CO2 from coalification of organic matter in the underlying strata.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1998

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