Table I

Starting and final compositions for the evaporation of a synthetic "sulfate type" Topopah Spring Tuff pore water.


Leg l FEC 9 molala starting
Leg l FEC 9 molal, 95°C starting
Leg l FEC 9 molal, 95°C final
Leg 2 FEC 12 molal, 95°C starting
Leg 2 FEC 12 molal, 95°C final
Leg 3b FEC 13 molal, 95°C starting
Leg 3 FEC 13 molal, 95°C final
Leg 4b FEC 14 molal, 95°C starting
Leg 4 FEC 14 molal, 95°C final

PHa
9.65
nac
7.15
7.60
7.32
7.69
nac
8.08
6.97
F
5.94 × 10-5
ndd
ndd
ndd
ndd
ndd
ndd
ndd
ndd
Ca
1.57 × 10-3
1.25 × 10-3
4.36 × 10-3
4.69 × 10-3
2.25 × 10-2
2.17 × 10-2
4.21 × 10-2
4.06 × 10-2
1.03 × 10-2
Mg
1.01 × 10-3
6.48 × 10-4
5.58 × 10-4
6.05 × 10-4
4.52 × 10-3
1.06 × 10-3
6.43 × 10-3
1.88 × 10-3
9.02 × 10-3
Na
2.84 × 10-3
3.04 × 10-3
9.23 × 10-3
1.10 × 10-2
1.05 × 10-1
1.11 × 10-1
1.15
1.12
7.42
SiO2
1.39 × 10-3
9.21 × 10-4
1.15 × 10-3
1.38 × 10-3
7.91 × 10-3
2.24 × 10-3
6.32 × 10-3
3.09 × 10-4
1.89 × 10-5
K
1.76 × 10-4
1.63 × 10-4
5.15 × 10-4
5.82 × 10-4
5.66 × 10-3
6.54 × 10-3
6.99 × 10-2
7.89 × 10-2
8.09 × 10-1
Cl
3.26 × 10-3
3.31 × 10-3
1.00 × 10-2
9.80 × 10-3
9.80 × 10-2
1.05 × 10-1
9.93 × 10-1
1.09
6.59
NO3
3.53 × 10-4
3.94 × 10-4
1.15 × 10-3
1.32 × 10-3
1.12 × 10-2
1.18 × 10-2
1.29 × 10-1
1.32 × 10-1
1.42
SO4
1.23 × 10-3
1.85 × 10-3
4.54 × 10-3
4.64 × 10-3
2.35 × 10-2
2.24 × 10-2
5.85 × 10-2
5.80 × 10-2
1.36 × 10-1
HCO3
7.93 × 10-4
3.11 × 10-4
ndd
1.59 × 10-4
ndd
1.92 × 10-4
ndd
1.95 × 10-4
2.66 × 10-4

aMeasured at room temperature.

bMagnesium and silica precipitated from the solution at 25°C. Initial gravimetric concentrations are Mg = 4.5 × 10-3 mol/kg-solution and Si = 7.8 × 10-3 mol/kg-solution for Leg3 and are Mg = 6.0 × 10-3 mol/kg-solution and Si = 5.9 × 10-3 mol/kg-solution for Leg4.

cNot analyzed.

dNot detected, detection limits: F = 0.25 ppm, HCO3 = 1 ppm.

Alai et al. Geochemical Transactions 2005 6:31   doi:10.1186/1467-4866-6-31