Geology Reference
In-Depth Information
Figure 2.8
South Caspian Depression. Productive Sequence ground water composition
vs. their salinity.
t
On all structures, the localization of most alkaline waters
in the fault zones, mud volcanoes, diapirs, etc. (Figures 2.9,
2.10) (Akhundov, Mekhtiyev and Rachinsky, 1976; Ismailov
and Kurbanova, 1986; Mekhtiyev, Rachinsky and Akhundov,
1966).
The former feature is commonly called “hydrochemical inversion” in
publications.
Regionally, a continuous increase in ground water salinity and hardness
is recorded down the regional dip and corresponding with the weakening
of structure faulting (Figure 2.11).
A specific feature of the Middle Pliocene ground waters is the presence
of sulphate-ions. Their content (mg-equiv./100 g.) is between “traces” and
22 mg-equiv. It regularly increases with depth (
H
, m) (Figs. 2.12, 2.13)
(Mekhtiyev, Rachinsky and Kuliyev, 1984; Rachinsky and Akhundov, 1968;
Rachinsky, 1973; Rachinsky and Aliyev, 1973) and its sulphate contents are
