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Clay minerals as records of temperature conditions and duration of thermal anomalies in the Paris Basin, France: discussion

Published online by Cambridge University Press:  09 July 2018

C. Spötl ,
R. H. Worden  and
F. Walgenwitz
C. Spötl
Affiliation:
Institut für Geologie und Paläontologie, Universität Innsbruck, Innrain 52, 6020 Innsbruck, Austria
R. H. Worden
Affiliation:
School of Geosciences, The Queen's University of Belfast, Belfast, BT7 1NN, UK
F. Walgenwitz
Affiliation:
Elf Aquitaine Production, CSTJF avenue Larribau, 64018 Pau Cedex, France
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Abstract

A highly illitic phase containing <5–10% interstratified smectite was described by Mossmann et al. (1992) and, more recently, by Clauer et al. (1995) from Upper Triassic sandstones of the Paris Basin (France). This phase is present in all size-fractions of all samples and was interpreted as authigenic. The K/Ar model ages of this illite range from 189–200 Ma and, combined with oxygen isotope data, were cited as evidence of high-temperature (220–250°C hydrothermal precipitation from highly 18O-enriched fluids at burial depths of only 500 m.

We suggest that this type of illite is more likely to be diagenetically altered detrital illitic material and unlike authigenic illite-smectite which is also present in many of their samples. This reassessment of their petrographic observations leads to a much more realistic diagenetic interpretation consistent with previous studies of the basin and avoids the need to invoke basin-wide hydrothermal activity during shallow burial.

Type
Research Article
Information
Clay Minerals , Volume 31 , Issue 2 , June 1996 , pp. 203 - 208
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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