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Table 1 Chemical composition and stable isotope contents of waters in the study area (Bürchau, B1-4, Badenweiler, B5): results for the two sampling campaigns in June and July 2013 and earlier studies

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

Spring B1 B2 B3 B4 B5 B1 Schmassmann et al. ( 1984 ) B1 Carlé ( 1975 )
  JUN13 JUL13 JUN13 JUL13 JUN13 JUL13 JUN13 JUL13 JUN13 JUL13 1981 to 1983 1958
Temperature [°C] 15.1 18.1 9.3 9.7 - - 8.3 - 18.7 20.4 16.8 -
Conductivity [μS cm−1] 152 149 49 61 49 46 46 55 429 420 - -
O2 concentration [%] 62 66 92,8 77 105 97 98 90 72 71 - -
Redox potential [mV] 221 245 294 270 - 290 242 237 227 252 - -
pH 7.45 7.5 6.7 6.8 7.2 6.3 7.4 7.2 7.6 7.7 8.06 6.8
δ18O [‰] −9.77 −10.25 −9.82 −10.1 - −10.6 - −10.12 −9.58 −10.1 −9.86 -
δ2H [‰] −68.1 −68.7 −68.9 −68.4 - −70.9 - −68.0 −67.4 −69.2 −69.5 -
δ34S [‰] (from BaSO4 precipitation) 5.11 5.00 - 4.12 - - - - 12.88 12.95 - -
δ18O [‰] (from BaSO4 precipitation) 3.72 3.61 - 3.17 - - - - 6.04 5.88 - -
Amount [mg L−1]             
 Na 15.0 15.4 2.88 2.88 - 2.14 - 3.66 31.4 33.3 14.9 11.7
 K 1.21 1.21 0.55 0.54 - 0.33 - 0.6 3.1 3.27 1.21 -
 Ca 14.6 15.3 4.55 6.88 - 5.37 - 5.72 46.9 54.8 33.3 12.6
 Mg 1.21 1.3 0.85 1.33 - 1.11 - 0.84 6.58 7.16 2.80 3.7
 Li 0.0405 0.0419 0.0009 0.0011 - 0.0006 - 0.0007 0.134 0.138 0.048 -
 Sr 0.155 0.181 0.028 0.042 - 0.042 - 0.03 0.455 0.487 0.298 -
 Cl 1.85 1.79 3.3 3.59 - 1.48 - 3.73 8.58 8.93 1.91 4.5
 HCO3 85.4 79.3 18.3 24.4 - 42.7 - 42.7 159 165 71.0 67.1
 SO4 12.0 12.1 2.89 3.32 - 2.36 - 2.99 67.9 67.8 23.8 12.3
 F 1.85 1.9 0.13 0.23 - 0.2 - 0.12 0.82 0.8 1.86 -
 SiO2 - 22.3 - 4.1 - 4.4 - 5.3 - 19.6 23.8 7.5
Amount [μg L−1]             
 B 14.2 13.6 2.73 2.68 - 2.61 - 2.74 162.9 164 - -
 Fe 1.32 2.32 2.51 1.59 - 1.78 - 10.7 2.03 2.39 - -
 Cu 0.17 0.27 0.15 0.14 - 0.17 - 0.37 3.09 3.58 - -
 Zn 1.03 1.9 1.59 2.37 - 1.88 - 1.85 98.6 96.4 - -
 As 62.3 64.2 4.97 5.2 - 1.91 - 4.8 101.5 104 - -
 Rb 6.67 8.12 2.29 2.67 - 1.74 - 2.29 15.6 17.1 - -
 Mo 1.66 1.65 0.05 0.1 - 0.05 - 0.08 1.34 1.33 - -
 Cs 2.65 3.92 0.7 0.82 - 0.54 - 0.38 14.29 15.1 - -
 U 6.51 7.1 0.09 0.14 - 0.03 - 0.12 5.59 5.79 - -
 Ba 156 187 254 333 - 199 - 75.6 56.7 59.5 - -
TDS [mg L−1] 135 153 35.6 49.8 - 61.7 - 67.8 328 365 - -