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Table 2 Chemical and isotopic compositions of the estimated KDE, the Arima brine end-member, and fluid inclusions within metamorphic rocks in a subduction zone

From: Original composition and formation process of slab-derived deep brine from Kashio mineral spring in central Japan

  Temperature, °C pH Na, mg/L K, mg/L Mg, mg/L Ca, mg/L Cl, mg/L HCO3, mg/L SO4, mg/L Li, mg/L Br, mg/L Br/Cl, molar ratio, × 10−3 δD, ‰ δ18O, ‰ References
KDE 12 7.8 14,000 180 66 650 24,000 66 0 83 41 0.75 − 52 − 2 Present study
Arima end-member >138 25,900 5250 0.09 5020 54,000 78 115 0.92 − 32 10 Masuda et al. (1985)
21,000 3700 3100 42,000 55 84 2.0 − 33 6 Kusuda et al. (2014)
Fluid inclusions 600 ~ 3700 12,000 ~ 240,000 27 ~ 2000 1.0 ~ 3.7 Kendrick et al. (2011)
5400 ~ 53,000 1100 ~ 57,000 N.D. ~ 20,000 N.D. ~ 16 N.D. ~ 49 Fukuyama et al. (2017)
  1. KDE is extrapolated as described in the text. The composition of the Arima brine end-member is from Masuda et al. (1985) and Kusuda et al. (2014), and those of fluid inclusions are from Kendrick et al. (2011) and Fukuyama et al. (2017)