Geology Reference
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t The step-block structure of the trough caused by a system
of intersecting lengthwise and crosswise faults; it prevents
ground water migration down the regional slope.
t Tectonic isolation by the main Zagros overthrust of the
regional band of pre-Fars rocks' exposures (the so-called
“mountain front” using the terminology of the Southwest
Iran geology; Falcon, 1961) from the main trough terri-
tory. These exposures are the potential area of the meteoric
charge.
t The absence within the local highs of exposures of the major
reservoir intervals.
t Negative precipitation balance in the region incapable of
supplying the necessary volume of the infiltration water
flow.
t Mostly carbonate section and low horizontal permeability of
the limestone reservoirs.
t Ascending thermal sources in the piedmont zone producing
salt water.
Ground water migration under the elision model is also unlikely for the
following reasons:
t Low geostatic compaction of carbonate rocks and low like-
lihood of squeezing-out from them enough pore water to
provide for its lateral flow.
t Drastic decrease in limestone permeability toward the cen-
tral trough (Aliyev and Zabanbark, 1974).
t Practically zero fracturing in the peripheral parts of local
highs and within the inter-structural zones (Dunnington,
1961 1967).
t Low thickness gradients for individual stratigraphic com-
plexes up their regional dip (Alferov and Kurenkov, 1973;
Geodekian and Zabanbark, 1985).
t Step-block structure of the trough (Aliyev and Zabanbark,
1974; Bakirov, Varentsov and Bakirov, 1970; Vysotsky and
Kucheruk, 1978; Vysotsky, Olenin and Vysotsky, 1984;
Kalinin, 1977; Szteklin, 1966).
t Large faults in trough's axial and flank areas preventing lat-
eral hydraulic communications between the charge and dis-
charge areas and a number of differently oriented smaller
faults, which would refract the elision water flow.
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