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Table 4 Bulk rock composition (wt%) of basalts and carbonates and their initial Sr-isotopic signature

From: Geochemical/hydrochemical evaluation of the geothermal potential of the Lamongan volcanic field (Eastern Java, Indonesia)

Sample SiO2 TiO2 Al2O3 Fe2O3 MnO Mg CaO Na2O K2O P25 Total 87Sr/86Sr
FD1 46.1 1.37 19.1 12.9 0.20 4.58 10.9 2.73 0.85 0.08 99.7
FD8 50.3 1.63 15.6 13.4 0.20 3.27 8.11 2.53 1.61 0.39 99.6 0.70463 (±2)
WP2 47.0 1.09 19.4 12.1 0.19 4.99 10.8 2.48 0.63 0.11 99.7 0.70447 (±3)
WP9 49.4 1.06 17.9 10.9 0.16 2.68 7.86 2.86 2.26 0.38 99.7 0.70447 (±2)
WP8 50.0 2.00 14.4 15.5 0.25 3.87 7.68 2.54 1.90 0.53 99.6 0.70445 (±2)
WP11 47.2 1.20 19.0 12.7 0.20 4.67 10.4 2.65 0.64 0.17 99.8 0.70430 (±1)
WP12 44.9 0.92 15.3 12.7 0.19 10.8 11.8 1.56 0.29 0.09 99.8 0.70449 (±1)
WP14 50.7 0.99 20.0 9.3 0.15 2.75 8.21 2.85 2.12 0.41 99.7 0.70428 (±2)
WP17 46.0 1.32 19.2 12.8 0.20 4.92 11.2 2.67 0.84 0.09 99.7 0.70464 (±3)
WP13 47.2 2.03 16.7 14.4 0.26 2.77 9.83 2.72 1.19 0.46 100.0
WP19 50.5 0.94 19.9 11.2 0.18 3.20 8.71 3.26 1.09 0.24 100.0
WP20 51.6 0.94 20.6 10.1 0.18 2.41 9.44 3.62 0.97 0.15 100.0
WP22 48.8 1.04 21.0 10.7 0.18 3.51 10.8 3.17 0.66 0.09 99.9
WP4aa 0.4 0.00 0.13 0.08 0.01 0.21 54.7 0.05 0.00 0.00 99.8
WP4ba 4.4 0.08 1.99 0.87 0.01 0.47 50.8 0.06 0.04 0.00 100.0
  1. aCarbonate rocks sampled outside the research area