Czigány Sz. - Lovász Gy. - PTE TTK FI - Pécsi Tudományegyetem

14
Czigány Sz.-Lovász Gy.: A mecseki karszt térképezésének újabb eredményei
Summary
Additional data on the mapping of the Western Mecsek karst area,
Southern Hungary
Czigány Szabolcs – Lovász György
The presented results provide new data on the geomorphological
development of the karst area of the Mecsek Mountains, Southern
Hungary. The surrounding non-karst areas have been playing an
important role on the development of the karst surfaces (Figure 1).
Gravelly, quartz-rich sediments were fluvially (and partly gravitationally)
transported to the study area from the southwestern ranges of the Mecsek
Mountains, where the prevailing rock type is Permian and lower Triassic
sandstone. The other type of development is autogene, where solely
precipitation shaped the karst surface. Some negative (erosional)
landforms are indicatives of sinkholes being in embrional stage (Figures
2, 3 and 4) while larger older sinkholes refer to more elongated surface
development. We also found a newly developed valley on the borderline
of the karst and non-karst (sandstone) areas. The embrional stage of this
valley is indicated by recently-formed sinkholes (Figure 3). Our studies
point out the presence of young sinkholes at the head valleys of the
actively developing valleys (Figure 4a).
Geodesic studies formerly indicated that two sinkhole sequences
were formed along a young (Pleistocene) faultline (Figures 2, „A” and
„B”). The relationship between the sinkholes and the faultline is clearly
visible on the geological map of the Mecsek Mountains. However,
several older pre-Pleistocene (Miocene and Pliocene) faultlines transect
the western ranges of the Mecsek Mountains, further complicating the
geology of the area.