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Université de Fribourg

Quantification of Lithological Heterogeneity Within Opalinus Clay : Toward a Uniform Subfacies Classification Scheme Using a Novel Automated Core Image Recognition Tool

Lauper, Bruno ; Zimmerli, Géraldine N. ; Jaeggi, David ; Deplazes, Gaudenz ; Wohlwend, Stephan ; Rempfer, Johannes ; Foubert, Anneleen

In: Frontiers in Earth Science, 2021, vol. 9, p. 645596

The Opalinus Clay is notable in Switzerland as being the selected host rock for deep geological disposal of radioactive waste. Since the early 1990’s, this argillaceous mudstone formation of Jurassic age has been intensively studied within the framework of national and international projects to characterize its geological, hydrological, mechanical, thermal, chemical, and biological...

Université de Fribourg

Geochemical fingerprinting of key lithologies and depositional processes across the upper boundary of the Opalinus Clay (Aalenian, Middle Jurassic, northern Switzerland)

Lauper, Bruno ; Deplazes, Gaudenz ; Vogel, Hendrik ; Jaeggi, David ; Wohlwend, Stephan ; Ariztegui, Daniel ; Foubert, Anneleen

In: The Depositional Record, 2021, vol. 7, no. 1, p. 25-51

The Opalinus Clay is an argillaceous to silty mudstone formation, notable in Switzerland as the selected host rock for deep geological disposal of radioactive waste. Its upper bounding unit (Passwang Formation and eastern equivalents) is composed of successions of mudstone, sandy bioclastic marl and limestone separated by ooidal ironstone beds. The lithostratigraphic transition is diachronous...

Université de Fribourg

Archaeometrical study of Khmer stoneware from the Angkorian period: Results from the Cerangkor Project

Thirion‐Merle, V. ; Thierrin‐Michael, Gisela ; Desbat, A.

In: Archaeometry, 2019, vol. 61, no. 6, p. 1246–1263

In the area around Angkor, Cambodia, several ceramics kilns dating from the ninth to 15th centuries ce have been discovered since 1995. The technical, typological and compositional characterization of their production has been one of the main goals of the Cerangkor Project. Samples of green‐glazed ‘Kulen‐type' stoneware and non‐ glazed stoneware produced in five kiln sites in the...

Université de Fribourg

Tectonics of the Neuchâtel Jura Mountains: insights from mapping and forward modelling

Rime, Valentin ; Sommaruga, Anna ; Schori, Marc ; Mosar, Jon

In: Swiss Journal of Geosciences, 2019, vol. 112, no. 2, p. 563–578

This study focuses on a geological section in the Jura Mountains across the villages of Travers, La Brévine in Switzerland, and Morteau in France. Field mapping was conducted to complement and densify existing data. A kinematically and geometrically consistent forward model has been developed to understand and interpret the observed surface structures. The proposed solution features a...

Université de Fribourg

Tectonics controls on fluvial landscapes and drainage development in the westernmost part of Switzerland: Insights from DEM-derived geomorphic indices

Radaideh, Omar M. A. ; Mosar, Jon

In: Tectonophysics, 2019, vol. 768, p. 228179

This work focuses particularly on the geomorphological evidence for the tectonic controls on the development of the present-day fluvial landscapes in the westernmost part of Switzerland. The tectonic deformation was evaluated on the basis of a combined analysis of several classical geomorphic indices (hypsometric curves and integrals, transverse topographic symmetry index, and channel's...

Université de Fribourg

Ecological constraints coupled with deep-time habitat dynamics predict the latitudinal diversity gradient in reef fishes

Gaboriau, Théo ; Albouy, Camille ; Descombes, Patrice ; Mouillot, David ; Pellissier, Loïc ; Leprieur, Fabien

In: Proceedings of the Royal Society B: Biological Sciences, 2019, vol. 286, no. 1911, p. 20191506

We develop a spatially explicit model of diversification based on palaeohabitat to explore the predictions of four major hypotheses potentially explaining the latitudinal diversity gradient (LDG), namely, the ‘time-area’, ‘tropical niche conservatism’, ‘ecological limits’ and ‘evolutionary speed’ hypotheses. We compare simulation outputs to observed diversity gradients in the...

Université de Fribourg

Mountain permafrost degradation documented through a network of permanent electrical resistivity tomography sites

Mollaret, Coline ; Hilbich, Christin ; Pellet, Cécile ; Flores-Orozco, Adrian ; Delaloye, Reynald ; Hauck, Christian

In: The Cryosphere, 2019, vol. 13, no. 10, p. 2557–2578

Mountain permafrost is sensitive to climate change and is expected to gradually degrade in response to the ongoing atmospheric warming trend. Long-term monitoring of the permafrost thermal state is a key task, but problematic where temperatures are close to 0 ∘C because the energy exchange is then dominantly related to latent heat effects associated with phase change (ice–water), rather...

Université de Fribourg

Physically based hydrogeological and slope stability modeling of the Turaida castle mound

Kukemilks, Karlis ; Wagner, Jean-Frank ; Saks, Tomas ; Brunner, Philip

In: Landslides, 2018, vol. 15, no. 11, p. 2267–2278

This study explores the potential of integrating state-of-the-art physically based hydrogeological modeling into slope stability simulations to identify the hydrogeological triggers of landslides. Hydrogeological models considering detailed morphological, lithological, and climatic factors were elaborated. Groundwater modeling reveals locations with elevated pore water pressures in the...

Université de Fribourg

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

Lauper, Bruno ; Jaeggi, David ; Deplazes, Gaudenz ; Foubert, Anneleen

In: Swiss Journal of Geosciences, 2018, vol. 111, no. 3, p. 383–398

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...

Université de Fribourg

Carbonate mounds of the Moroccan Mediterranean margin: Facies and environmental controls

Terhzaz, Loubna ; Hamoumi, Naima ; Spezzaferri, Silvia ; El Lotfi, Mostapha ; Henriet, Jean-Pierre

In: Comptes Rendus Geoscience, 2018, vol. 350, no. 5, p. 212–221

Sedimentological and geochemical studies of boxcores from the Brittlestar Ridge I and Cabliers carbonate mounds, along the Moroccan Mediterranean margin, show that sediments are composed of cold water scleratian corals and micritic mud, muddy micrite or muddy allochem limestone matrix, outlining seven different facies that can be attributed to “cluster reefs”. The mixed...