Geoscience Reference
In-Depth Information
(Jeannin
1990
; Bini et al.
1992
; Dublyansky
1995
)
the following elements are used in the present report:
(A) Displaced (shifted) sections in the cave pas-
sages—the original cross section of the passage has
been altered as a result of the action of a certain fault.
(B) Speleothems which cover the displacements
and in other cases are fractured by them.
Over the period March-June 1997, several visits to
Labirinta Cave led to the following observations:
I. A subvertical displacement with an amplitude of
16-17 cm, along a normal fault, excellently preserved
in a primary cave formation—rock bridge or ''pillar''
structure—sensu Jeannin (
1990
) (Fig.
3.29
). In this
passage the fault-plane strikes 146 g with 808 NE dip.
This fault can also be traced in the cave over nearly
50 m but in other cross sections of the passage, the
shift is not so distinctly visible because of the existing
gravitational and weathering processes.
The occurrence of a ''hanging'' dendritic cover
over the fault-plane implies the existence of two
phases of movement. The precipitation and lithifica-
tion of the speleothems occurred during a relatively
calm period between the two phases of tectonic
activity (Fig. 3). In terms of morphology, the first
Fig. 3.26
Sampling of the tall stalagmite in Varteshkata Cave
Fig. 3.27
The entrance of
Labirinta Cave
