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Swiss Journal of Geosciences
Fig. 14 | Swiss Journal of Geosciences

Fig. 14

From: Fluid flow through the sedimentary cover in northern Switzerland recorded by calcite–celestite veins (Oftringen borehole, Olten)

Fig. 14

Permian to present Sr isotope composition of seawater (from McArthur et al. 2001) in comparison to the Sr isotope composition of rocks and minerals from the Oftringen core. Times of marine and freshwater sedimentation and erosion in the studied area (top of figure) are from Kuhlemann and Kempf (2002). The curve of the 87Sr/86Sr ratio of seawater over time is solid black when marine conditions prevailed in the region of interest and dotted grey for continental conditions. The grey area indicates the 87Sr/86Sr range of whole-rock carbonate, and the hatched area represents the range for calcite and celestite from veins. White areas show the preserved sedimentary sequence as encountered in the borehole. The upper limit of the Oligocene–Miocene field has a question mark because the exact timing of the erosive surface in the Lower Freshwater Molasse is unknown. Time of deposition of each molasse unit is shown on top of the figure: OSM Upper Freshwater Molasse, OMM Upper Marine Molasse, USM Lower Freshwater Molasse, UMM Lower Marine Molasse

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