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

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

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

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