Table 2 Geologic aquifer type endmember compositions and model outputs of global groundwater chemistry.

From: Groundwater discharge impacts marine isotope budgets of Li, Mg, Ca, Sr, and Ba

Parameter

Aquifer Type

[Li] (μM)

δ7Li (‰)

[Mg] (mM)

δ26Mg (‰)

[Ca] (mM)

δ44/42Ca (‰)

[Sr] (μM)

87Sr/86Sr

δ88/86Sr (‰)

[Ba] (μM)

δ138/134Ba (‰)

Extrusive Igneous

0.04

28.6

0.1

−0.85

1.1

0.51

3

0.70695

0.357

0.8

0.10

Carbonate

2.42

24.0

3.3

−1.78

4.3

0.49

15

0.70862

0.255

1.5

0.11

Intrusive Igneous

1.81

28.4

2.1

−1.09

0.8

0.53

2

0.71253

0.411

1.0

0.01

Sedimentary

1.52

19.1

0.7

−1.08

1.5

0.62

2

0.70931

0.354

1.6

0.15

No Lithology

1.45

25.0

1.6

−1.20

2.0

0.54

5

0.70935

0.344

1.3

0.10

  1. No Lithology represents the Complex/No Litho classification units used in the Beck et al.4 and Luijendijk et al.2, respectively. It is represented by a concentration-weighted average of all four lithologic average aquifer type endmembers.
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