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Table 3 Calculated reservoir temperatures

From: Hydrochemical characterisation of a major central European heat flux anomaly: the Bürchau geothermal spring system, Southern Black Forest, Germany

Geothermometer Temperature calculation [t in °C] Calculated reservoir temperature for B1 [°C] Calculated reservoir temperature for B5 [°C]
S = Si-concentration as SiO 2 in mg kg −1
α = isotopic relation between SO 4 and H 2 O (fractionation factor)
Quartz (Fournier 1977) \( t=\frac{1,309}{5.19 - \log S}-273.15 \) 68 63
Quartz (Arnórsson et al. 1998a) \( \begin{array}{l}t=-55.3+0.3659S-5.3954\times {10}^{-4}{S}^2\\ {}+5.5132\times {10}^{-7}{S}^3+74.36 \log S\end{array} \) 55 49
Quartz (Verma 2000) \( t=\frac{1,175}{4.88- \log S}-273.15 \) 60 55
Chalcedony (Fournier 1977) \( \mathrm{t}=\frac{1,032}{4.69\hbox{--} \mathrm{logS}}-273.15 \) 36 31
Chalcedony (Arnórsson et al. 1983b) \( \mathrm{t}=\frac{1,112}{4.91- \log S}-273.15 \) 39 34
SO4 2−-H2O (Halas and Pluta 2000) 103 lnα (SO4-H20) = 2.41·106/t 2 – 5.77 77 59
SO4 2−-H2O (Zeebe 2010) 103 lnα(SO4-H20) = 2.68·106/t 2 – 7.45 81 65