Journal article

Multi-proxy facies analysis of the Opalinus Clay and depositional implications (Mont Terri rock laboratory, Switzerland)

  • Lauper, Bruno Department of Geosciences, University of Fribourg, Switzerland
  • Jaeggi, David Federal Office of Topography swisstopo, Wabern, Switzerland
  • Deplazes, Gaudenz National Cooperative for the Disposal of Radioactive Waste (Nagra), Wettingen, Switzerland
  • Foubert, Anneleen Department of Geosciences, University of Fribourg, Switzerland
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  • Swiss Journal of Geosciences. - 2018, vol. 111, no. 3, p. 383–398
English Located in NW Switzerland, the Mont Terri rock laboratory is a research facility primarily investigating the Opalinus Clay as potential host rock for deep geological disposal of radioactive waste. In the Mont Terri area, this Jurassic shale formation is characterized by three distinctive lithofacies: a shaly facies, a carbonate-rich sandy facies and a sandy facies. However, the lithological variability at dm- to cm-scale is not yet fully understood and a detailed lithofacies characterization is currently lacking. Within the present study, petrographic descriptions at micro- and macro-scale, geophysical core logging (P-wave velocity and gamma-ray density), geochemical core logging (X-ray fluorescence) and organic matter quantification (Rock-Eval pyrolysis) were combined on a 27.6 m long Opalinus Clay drillcore comprising the three major lithofacies. The high-resolution investigation of the core resulted into a refinement of the three-fold lithofacies classification, and revealed high intra-facies heterogeneity. Five subfacies were defined and linked to distinctive depositional regimes. The studied succession is interpreted as a shallowing-upward trend within a storm-wave- dominated epicontinental sea characterized by relative shallow water depths.
Faculté des sciences et de médecine
Département de Géosciences
  • English
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