Geology Reference
In-Depth Information
S
2,_
%-equiv 40
30 20
10
0
10
20
30
40
50
60 70
A,
%- equiv
I
180
200
220
240
260
280
300
320
340
360
380
400
420
440
460
∑
II
I
II
, mg- equiv
Figure 2.26
Viennese Basin. Paleogene-Mesozoic ground water ion-salt composition vs.
total salinity I-I. Bockflies-Bockflies-Tief-Schonkirchen- Schonkirchen-Tief;
II-II.
Schonkirchen-Ubertief, Reiersdorf, Schonfeld.
Syndepositional chlorine-calcium brines of the Paleogene-Mesozoic
(Lower) structure stage are common in the internal zones of the nappes.
They have certain hydrochemical image [specific composition where a
substantial role is played by chlorine and calcium and magnesium sul-
phates; high salinity; high (2,500 and greater) chlorine-bromine ratio; ele-
vated sulphate content, etc.]. That and mode of occurrence in the natural
reservoirs (the contact with salt accumulations identified in the sections
of the overlying nappes: Agabekov, 1963; Dolenko, 1974; Reznikov, 1970;
Koelbl, 1967; Krejci-Graf, Hecht and Pasler, 1957) best of all fit the forma-
tion concept of such waters as metamorphosed depositional solutions of
the evaporite depositional basin.
In the hydrocarbonate-sodium waters of the hydrochemical back-
ground from the Neogene Stage, total salinity consistently declines, and
primary alkalinity factor increases up the section. They bear in their
composition and distribution patterns the traces of clear effect from the
sediment-genesis and diagenesis factors, i.e., paleogeographic depositional
environment. This environment included a number of factors such as:
stratigraphic and lithological unconformities; erosions; time-progressing
shrinking of the depositional basin boundaries and drastic desalination;
