Assessment of Chaves Low-Temperature CO2-Rich Geothermal System (N-Portugal) Using an Interdisciplinary Geosciences Approach
Table 1
Representative physicochemical data of the Chaves low-temperature CO2-rich geothermal system and the cold CO2-rich mineral waters of the region. Typical physicochemical signatures of the local shallow cold dilute normal groundwaters were also included. Concentrations in mg/L. Table 1 is reproduced from Marques et al. (2006) [under the Creative Commons Attribution License/public domain].
Reference
Local
Type
T (°C)
pH
Cond.
Na
K
Ca
Mg
Li
HCO3
SO4
Cl
NO3
F
SiO2
DR
ACP1 ()
Vilarelho da Raia
(bw)
17.2
6.6
2350
600
22.8
26.3
5.25
1.20
1579
13.0
21.5
0.3
5.40
54.9
1523
AC2 ()
Chaves
(bw)
77.0
6.9
2550
668
62.5
22.1
5.25
2.68
1707
18.3
35.3
n.d.
7.20
86.1
1702
Nas. ()
Chaves
(sp)
66.0
6.8
2430
633
63.0
23.4
5.75
2.56
1604
23.8
38.1
0.3
6.90
82.9
1634
Castelões ()
Chaves
(sp)
11.6
5.8
36
5
0.5
1.3
0.40
0.04
12
0.4
2.7
1.8
0.15
21.6
31
AC16 (●)
Vidago
(bw)
17.6
6.1
1910
423
37.3
73.5
11.50
1.94
1286
7.9
17.3
n.d.
3.50
58.4
1217
AC18 (●)
Vidago
(bw)
17.0
6.7
6230
1525
106.5
223.0
37.00
6.40
4689
1.9
66.0
1.6
3.40
59.8
4346
Areal 3 (●)
Vidago
(bw)
12.3
6.9
6250
1585
96.5
132.0
28.00
9.44
5418
n.d.
54.0
n.d.
2.70
68.1
4205
Baldio ()
Vidago
(sp)
11.9
6.4
74
9
0.2
2.8
1.25
0.01
11
10.3
5.3
3.8
n.d.
26.5
76
AC17 (■)
Pedras Salgadas
(bw)
16.1
6.3
2880
580
28.3
183.5
26.00
2.00
2010
10.3
32.0
n.d.
2.50
79.9
1886
AC25 (■)
Pedras Salgadas
(bw)
17.9
6.4
4120
957
48.5
193.0
50.00
3.10
3057
2.3
32.6
n.d.
1.50
73.9
2781
AC22 (■)
Pedras Salgadas
(bw)
14.8
6.5
5340
1285
37.0
227.0
41.00
1.00
4546
n.d.
51.0
n.d.
1.00
61.2
3663
Notes: T: water temperature; Cond. : electrical conductivity in μS/cm; DR: dry residuum; n.d.: not detected (below detection limits). () Chaves low-temperature CO2-rich geothermal waters; cold CO2-rich mineral waters from () Vilarelho da Raia, (●) Vidago, and (■) Pedras Salgadas. () stands for local shallow cold dilute normal groundwaters. sp: stands for spring waters; bw: stands for borehole waters.
