Geoscience Reference
In-Depth Information
Fig. 3.28
Map of Labirinta
Cave. I and II: sites of the
measurements
phase that ranges from the genesis of the cave (Early
Pleistocene) to the period of the precipitation of the
sinter
account the absence of these speleothems on the fault-
plane, it can be inferred that this fracture is relatively
younger than that described above. It is also possible
that this crack has a local cause—gravity or sliding
along a slope.
Based on the performed investigations, it has been
established that Labirinta Cave is developed in an
area of intense Quaternary tectonic activity. Accord-
ing to the intensity scale of unstable karst phenomena
of Gilli (
1995
), this cave ranges in the 4th degree:
decimetric to decametric displacement of passage
sections. In previous karstological investigations
(Ilieva et al.
1981
, Angelova et al.
1995
) mostly
vertical neotectonic movements and their importance
is
more
distinct
(12-14 cm
displacement
amplitude).
The
second
phase
is
recognized
in
a
2-3 cm
long
displacement.
Unfortunately,
the
absence
of
speleothems
dating
renders
the
above
conclusions debatable.
II. A subhorizontal displacement striking 160 g
and dipping 25 g to the SW is situated on the wall of
the same passage (Fig.
3.30
). The shift amplitude is
10-14 cm, but there are some additional 8-10 cm
which could be taken into account, located between
the overhang and the foot of the walls. The fracture
broke
the
sinter
deposits
(dendrites).
Taking
into
