Hostname: page-component-cd9895bd7-jkksz Total loading time: 0 Render date: 2024-12-26T08:52:53.791Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access Rights & Permissions [Opens in a new window]

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Clauer, N., O'NEIL, J. R. & Furlan, S. (1995) Clay minerals as records of temperature conditions and duration of thermal anomalies in the Paris Basin, France. Clay Miner. 30, 1–13.Google Scholar
Demars, C. (1994) Evolution diagenetique, paleofluids et paleothermicite dans les reservoirs du Keuper et du Dogger du Bassin de Paris, PhD thesis, Nancy, France.Google Scholar
Demars, C. & Pagel, M. (1994) Paleotemperatures et paleosalinites dans les gres du Keuper du Bassin de Paris: inclusions fluides dans les mineraux authigenes. Compt. Rend. Acad. Sci. Paris, 319, serie II, p 427-434.Google Scholar
Friedman, I. & O'NEIL, J.R. (1977) Compilation of stable isotope fractionation factors of geochemical interest. In: Data of Geochemistry (Fleischer, M., editor). U.S. Geol. Survey Prof. Paper, 440-KK, 1-12.Google Scholar
Guilhaumou, N. (1993) Paleotemperatures inferred from fluid inclusions indiagenetic cements: implications for the thermal history of the Paris Basin. Eur. J. Mineral. 5, 1217–1226.Google Scholar
Lanson, B. & Champion, D. (1991) The I-S-to-illite reaction in the late stage diagenesis. Am. J. Sci. 291, 473–506.Google Scholar
Moore, D.M. & Reynolds, R.C. (1989) X-ray Diffraction and the Identification and Analysis of Clay Minerals, Oxford University Press, Oxford.Google Scholar
Mossmann, J.R. (1991): K-Ar dating of authigenic illitesmectite clay minerals: application to complex mixtures of mixed-layer assemblages. Clay Miner. 26, 189–198.Google Scholar
Mossmann, J.R., Clauer, N. & Liewig, N. (1992) Dating thermal anomalies in sedimentary basins: the diagenetic history of clay minerals in the Triassic sandstones of the Paris Basin, France. Clay Miner. 27, 211–226.CrossRefGoogle Scholar
Spotl, C., Matter, A. & Brevart, O. (1993) Diagenesis and porewater evolution in the Keuper reservoir, Paris basin (France). J. Sed. Pet. 63, 909–928.Google Scholar
Walgenwitz, F. & Worden, R.H. (1993) Decoupling of thermal histories in the Paris Basin. Terra Abstracts, Suppl. No.l to Terra Nova 5, 659.Google Scholar
Worden, R.H. & Matray, J.M. (1995) Cross formational flow in the Paris Basin. Basin Research 7, 53–66.CrossRefGoogle Scholar
Worden, R.H., Coleman, M.L. & Matray, J.-M. (in prep.) Basin scale evolution of formation water: open system and diagenetic influences upon water chemistry.Google Scholar