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Swiss Journal of Geosciences volume , pages — Cite this article. Metrics details. The present study reports on elemental and Sr isotopic analyses of calcite and associated celestite infillings of various microtectonic features collected mostly in the Main Fault of the Opalinus Clay from Mont Terri rock laboratory.
Based on a detailed microstructural description of veins, slickensides, scaly clay aggregates and gouges, the geochemical signatures of the infillings were compared to those of the leachates from undeformed Opalinus Clay, and to the calcite from veins crosscutting Hauptrogenstein, Passwang and Staffelegg Formations above and below the Opalinus Clay.
To envision a Priabonian seawater supply, there is a need for its storage without a significant evolution in its Sr isotopic composition until the final deformation of the area. The paleo-hydrogeological context calls for a possible infiltration of the seawater into a limestone karst located above the Opalinus Clay that could have acted as the storage reservoir. An alternative storage could have been provided by the regional faulting system that developed during the contemporary regional rifting of the Rhine Graben.
The fluid expulsion started along these extensional faults during the further Upper Eocene—Lower Oligocene rifting phase. Later, the thin-skinned deformation of the Jura Belt affected the Mont Terri region in the form of the Main Fault, probably between approximately 9 and 4 Ma on the basis of preliminary K—Ar ages of nanometer-sized authigenic illite crystals recovered from gouge samples.
Petrophysical characteristics of argillaceous sediments are critically important for a reliable evaluation of their abilities to safely confine buried wastes, especially those of the nuclear industry. In this context, the Opalinus Clay of the Mont Terri rock laboratory has been selected as a case study for evaluation of its intrinsic storage characteristics.