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Swiss Journal of Geosciences

Table 4 Overview of the assumed palaeo-hydrogeological evolution and values used for transport modelling of the time period between deposition of Opalinus Clay and the onset of flushing of the Dogger aquifer at 6 Ma

From: Pore-water evolution and solute-transport mechanisms in Opalinus Clay at Mont Terri and Mont Russelin (Canton Jura, Switzerland)

Time period Age (Ma) Model time (Myr) Environment Data used for modelling Significance in model calculations
Jurassic-Cretaceous 201–66   Open marine Cl− at 66 Ma = 19.35 g/L, δ18O = 0‰ throughout the sequence Initial and upper boundary condition
Palaeogene 66–23 0–43 Continental Meteoric water (Cl− = 0 g/L, δ18O = −7.7‰) circulating in Malm aquifer Upper boundary condition
Aquitanian (and younger?) 23–a 43–b Hypersaline (partial evaporation of sea-water) Cl− = 70–190 g/L, δ18O = +6‰ in Malm aquifer Upper boundary condition
- Late Miocene a–6 b–60 Continental Meteoric water (Cl− = 0 g/L, δ18O = −8.6‰) circulating in Malm aquifer Upper boundary condition
  1. a = 14.5 Ma/19.5 Ma, b = 51.5 Myr/46.5 Myr for model variants considering brine at gypsum saturation (Cl− = 70 g/L)/brine at halite saturation (Cl− = 190 g/L). For the model variant considering brine at gypsum saturation (Cl− = 70 g/L), a = 14.5 Ma, b = 51.5 Myr. For the model variant considering brine at halite saturation (Cl− = 190 g/L), a = 19.5 Ma, b = 46.5 Myr
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