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Table 6 Element-wise release rates

From: Thermally driven fracture aperture variation in naturally fractured granites

Experiment Test conditions Element-wise release rates
\({P}_{\text{co}\_\text{r}}\) (MPa) \(T_\text{i}\) (\(^\circ\)C) \(T_\text{f}\) (\(^\circ\)C) \(\Delta\) t
(h)
\(\frac{{\text{Si}}}{{\text{Al}}}\) \(\frac{{\text{Si}}}{{\text{Ca}}}\) \(\frac{{\text{Si}}}{{\text{Fe}}}\) \(\frac{{\text{Si}}}{{\text{K}}}\) \(\frac{{\text{Si}}}{{\text{Na}}}\) \(\frac{{\text{Si}}}{{\text{Mg}}}\) \(\dot{M}_{\text{Si}}\) (10\(^{-11}\) mol \(\text {s}^{-1}\))
\(\#\)N14-S1 20 25 110 70 > 100 5 > 100 2 0 27 3.876
110 25 44 > 100 5 > 100 a 5 > 100 1.596
\(\#\)N14-S2 30 25 110 85 b 9 > 100 a b b 0.955
110 25 52 b 3 b a b b 0.822
\(\#\)N14-S3 40 25 140 83 > 100 72 >100 a b b 9.304
\(\#\)N19-C1 20 25 110 51 > 100 3 >100 1 0 9 4.305
110 25 41 > 100 5 35 2 1 16 2.602
\(\#\)N19-C2 30 25 110 67 >100 4 > 100 2 1 15 1.318
110 25 34 87 13 70 3 2 45 3.959
  1. The ratios of the mean release rate of Si to the mean release rates of the other major elements, where \(\dot{M}_text{Si}\) [\(\text {mol}\,\text {s}^{-1}\)] is the mean release rate of silicon
  2. aBelow detection limit      
  3. bUndetectable increment