Cabała J., 1996: Active mode of tectonic deformation of Silesian -Cracovian Zn-Pb
ore mine area. Tectonophisic of Mining Areas. Prace Naukowe U nr 1602 s. 65-78.
Z powrotem do
publikacje Jerzy Cabała
Active mode of tectonic deformation of Silesian-Cracovian
Zn-Pb ore mine area.
Abstract:
In the area between Olkusz and Zawiercie towns, Triassic monoclinal
carbonate lithologies "host" deposits of Zn-Pb suphides. These deposits are well
recognised by boreholes and mining excavations in some localities. Basing on the research,
the occurrence of a deep active tectonic zone of NW SE course was revealed. Some premises
were presented, confirming the existence of an important discontinuity in the basement.
The tectonic deformations in the Triassic and Jurassic cover were a result of a horizontal
basement movement.
Some examples of much complicated tectonic structures: reverse, pivotal
and shifted gravity faults were presented. An analysis of tectonic directions enabled to
select some areas where faults form non-typical, star-shaped, rhombohedral or en echelon
network. An opinion were expressed that some graben and horst structures were created in
active way as a result of uplifting within a complicated stress field
Conclusions
Positive, active tectonic movements in the Triassic cover can be a
result of a horizontal tectonic movement in the deep basement during Mesozoic era. It is
very difficult to present evidences for the existence of that kind of movement, but some
premises can be presented:
ˇ in discussed area the NW-SE zone shouid exist which is a
contact zone between Upper Silesian Massif (moving during Palaeozoic era) and Little
Poland Massif.
ˇ old-Palaeozoic rocks occur in the basement of Mesozoic cover
in NE area from a hypothetical discontinuity. This Palaeozoic rocks occur on a different
depth than the
-4
rocks known in southern and western areas.
Devonian rocks situated on the line Zawiercie-Siewierz-Klucze-Olkusz-Dębnik form local
elevations, clearly distinguished in the Triassic basement morphology.
ˇ signs of volcanism in Myszków and Mrzyglód region
(Juskowiak et al, 1978) can confirm the break character of this zone.
ˇ maps of gravity anomaly (Kurbiel, 1979) show a number of
NW-SE elongated anomalies in the discussed region.
ˇ occurrence of zinc and lead deposits in the carbonate
Triassic and Devonian rocks only in the SW area from a
hypothetical zone (Harańczyk 1988, Wodzicki 1987) and the occurrence of Zn-Pb
mineralization in Carboniferous and Permian rocks.
Ore mineralization in Triassic and Devonian sediments is clearly
related with latitudinal tectonic structures (grabens, half horsts and horsts) The
relation between the tectonics and the mineralization exists, but it is difficult to
determine a strict relationships between them. A rnajority of faults and tectonic
discontinuities within ore pockets is epigenetic in relation to the mineralization.
Nevertheless numerous examples shows that the mineralization is developed in fault zones,
particularly in their downthrown sides.
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