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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

‰