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Table 2 Chemical and stable isotopes results for confined aquifer systems

From: Groundwater age and hydrothermalism of confined aquifers in the Argentine Pampean plain

   pH EC (μS/cm) HCO3 (mg/L) SO −24 (mg/L) Cl (mg/L) Na+ (mg/L) K+ (mg/L) Ca+2 (mg/L) Mg+2 (mg/L) SiO2 (mg/L) Li (µg/L) ɛ (%) δ18O (‰) δ2H (‰) 3H (TU)
A1 CAS (n = 5) C7 7.64 2470 520.0 770.0 157.1 503.5 19.9 83.6 31.5 42 60 0.4 −5.0 −29 1.5 ± 0.2
C8 7.58 2170 405.0 834.0 142.9 386.8 17.7 114.8 24.1 40 nd 6.4 −4.9 −29 nd
C9 7.71 2510 445.0 878.6 151.4 482.3 19.3 87.2 32.2 44 nd 3.1 −4.8 −25 2.1 ± 0.2
C20 7.95 2170 407.5 634.9 131.4 429.7 17.4 81.6 24.1 nd nd −2.6 −4.8 −28 nd
C22 7.80 1960 310.0 476.2 148.6 394.3 16.4 64.8 21.0 99 70 −7.2 −5.4 −32 1.6 ± 0.4
A2a CAS (n = 5) C1 7.87 1870 370.0 625.2 112.9 382.2 16.0 64.0 23.9 44 nd 0.9 −5.4 −31 1.5 ± 0.2
C6 7.50 3050 440.0 806.2 164.3 580.4 23.0 98.0 45.4 nd nd −8.6 −4.6 −28 nd
C10 7.74 2240 335.0 719.9 144.3 449.9 16.4 87.2 17.8 47 70 −1.8 −5.2 −25 nd
C11 7.86 1872 302.5 582.0 97.1 316.0 15.2 82.4 18.5 51 50 0.7 −5.3 −27 2.1 ± 0.2
C13 7.77 1786 275.0 488.7 95.7 303.3 13.8 81.6 11.7 50 60 −2.7 −4.9 −28 2.5 ± 0.2
A2b CAS (n = 11) C2 7.85 1268 275.0 376.2 78.6 219.9 12.2 52.0 7.8 79 nd 6.2 −5.9 −37 1.8 ± 0.4
C3 7.80 1298 317.5 350.0 77.1 232.1 13.5 47.2 8.3 85 nd 6.0 −5.5 −34 nd
C4 7.72 1850 225.0 624.5 211.4 390.3 11.9 55.2 8.8 42 60 5.4 −6.6 −42 nd
C5 7.85 1713 230.0 497.1 150.0 321.5 11.1 48.0 6.1 57 nd 4.3 −6.1 −41 nd
C15 8.15 1484 230.0 502.6 85.7 289.2 10.7 52.8 4.4 43 50 3.2 −4.9 −31 1.5 ± 0.4
C16 8.16 1286 230.0 433.3 65.7 230.5 11.4 53.6 6.3 41 nd 4.7 −4.8 −30 nd
C17 8.04 944 217.5 276.2 57.1 190.1 9.2 29.6 2.9 83 50 4.3 −5.5 −34 nd
C18 8.14 1140 210.0 253.6 127.1 242.7 6.9 24.0 1.5 48 50 2.1 −6.5 −41 nd
C19 7.75 1458 200.0 370.2 175.7 262.9 9.4 32.8 2.9 42 nd 9.1 −6.5 −43 nd
C21 7.73 1377 253.3 414.3 111.4 257.8 12.9 48.0 7.1 nd nd 5.5 −6.5 −38 1.8 ± 0.4
C23 7.41 1246 245.0 384.5 80.0 236.6 10.5 41.6 4.4 86 nd 5.5 −6.3 −34 nd
  1. ɛ ionic balance