Progress in Earth and Planetary Science

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
	δ¹³C_DIC		−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
	δ¹³C_DIC		−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
	δ¹³C_DIC		−24.7	‰

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