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Effects of burial on the clay assemblages in the Triassic Skagerrak Formation, Denmark

Published online by Cambridge University Press:  09 July 2018

R. Weibel
R. Weibel*
Affiliation:
Department of Earth Sciences, University of Aarhus, 8000 Aarhus C, Denmark
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Abstract

Sandstones and mudstones of the Skagerrak Formation from the Danish Sub-basin have been studied to assess the origin of the clay minerals, their diagenesis and their transformation/ conversion temperatures (compared to modelled maximum burial temperatures). Detrital smectite and vermiculite occur only at shallow levels. Conversion of smectite into random S-I took place at >47°C and of random S-I into ordered I-S at >74°C. The omnipresent illite increases in amount with burial. The amount of authigenic kaolinite (kaolin) decreases with increasing temperature (>75°C), possibly due to the growth of chlorite. Random S-C is converted into ordered S-C between 70°C and 105°C and chlorite is most abundant at maximum burial temperatures (150°C). This investigation suggests that diagenesis of clay minerals begins at relatively low temperatures, and emphasizes the importance of the availability of necessary ions (K+, Mg2+, Fe2+) for the reactions, besides time and temperature, as controlling parameters.

Type
Research Article
Information
Clay Minerals , Volume 34 , Issue 4 , December 1999 , pp. 619 - 635
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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