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Table 2 Chemical compositions of the initial seawater (SWi) for the thermodynamic calculations

From: Authigenic carbonate precipitation at the end-Guadalupian (Middle Permian) in China: Implications for the carbon cycle in ancient anoxic oceans

   Value Units
Aqueous species Na+ 495.0 mmol/L
  Cl 483.1 mmol/L
  SO4 2– 18.6 mmol/L
  Ca2+ 13.1 mmol/L
  DIC 2.0 mmol/L
Salinity   32.09 g/kg
Density   1.03 g/cm3
Ionic strength   0.55  
Carbonate alkalinity   1.96 meq/L
Calcite saturation index (Ω)   1.97  
Temperature   15 °C
pH   7.8  
δ13CDIC   2.0