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Table 3 Calculated reservoir temperatures
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 |