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Table 4 Chemical compositions of the seawaters used in the mixing calculations

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

    Value Units
SW1 Aqueous species Na+ 494.7 mmol/L
   Cl 483.1 mmol/L
   SO4 2− 17.9 mmol/L
   Ca2+ 13.1 mmol/L
   DIC 3.5 mmol/L
  Salinity   32.13 g/kg
  Density   1.03 g/cm3
  Ionic strength   0.55  
  Carbonate alkalinity   2.98 meq/L
  Calcite saturation index (Ω) 0.49  
  Temperature   15 °C
  pH   7.0  
  δ13CDIC   −10.1
SW2 Aqueous species Na+ 492.8 mmol/L
   Cl 483.0 mmol/L
   SO4 2− 14.0 mmol/L
   Ca2+ 13.2 mmol/L
   DIC 11.8 mmol/L
  Salinity   32.38 g/kg
  Density   1.03 g/cm3
  Ionic strength   0.55  
  Carbonate alkalinity   9.15 meq/L
  Calcite saturation index (Ω) 1.00  
  Temperature   15 °C
  pH   6.8  
  δ13CDIC   −21.2
SW3 Aqueous species Na+ 485.7 mmol/L
   Cl 482.6 mmol/L
   SO4 2− 0.0 mmol/L
   Ca2+ 13.6 mmol/L
   DIC 42.0 mmol/L
  Salinity   33.28 g/kg
  Density   1.03 g/cm3
  Ionic strength   0.53  
  Carbonate alkalinity   31.89 meq/L
  Calcite saturation index (Ω) 3.32  
  Temperature   15 °C
  pH   6.8  
  δ13CDIC   −24.7