Geneze a vyvoj Matejovicke jeskyne v Amalinske vrchovine na Osoblazsku

The Matějovická Cave is a small underground cavity in the north-eastern portion of Czechia, near the town of Osoblaha (Fig. 1). The cavity is formed in the western steep slope, 20-30 m above the bottom of the Hrozová valley. It is formed in the Cenomanian sandstones with subhorizontal layering stratification and transversal subvertical ruptures (NNE-SSW, NW-SE). The system of several short corridors and two bigger chambers is 25 m long and might be also used as an underground sand pit. The corridors are terminated by phreatic channels (fig. 3). The ceiling is formed by lower bedding planes, the bottom is filled by debris and sand. Two main chambers are disrupted by several transversal ruptures, which are gravitationally widened and filled with sand (Fig. 4). The entrance chamber is disrupted by a distinct weak tectonic zone with petrographical attributes different from the surrounding rock. We identified the Liesegang rings within this structure. The differences in composition are detectable between the samples from the cavity and from the superficial environment. The samples from the cavity contain contact clay mineral matrix without cement whereas the sample from the superficial environment contains clay minerals matrix with calcareous contact or overgrowth cement (Fig. 5). The investigated cavity should be considered a pseudokarst cave, which was discovered during historical mining works. The cave was formed by the erosion of incoherent sandstones by groundwater permeating into the massif along ruptures and bedding planes after the onset of the incision of the Hrozová River during the Alpine orogeny. The resulting corridors and chambers were anthropogenically modified. The jointed massif is affected by gravitational movements. The cave is now fossilized, and the active development is limited to the inflow of melting water and rainwater. The cave is a combination of fissure and bedding cave types (Vítek 1978) or fluvial channel erosion cave combined with exfoliation cave (Bella - Gaál 2013).

References

Baroň, I. - Bečkovský, D. - Míča, L. (2014): Application of infrared thermography for mapping open fractures in deep-seated rockslides and unstable cliffs. - Landslides 11, 15-27.View article

Bella, P. - Gaál, L. (2013): Genetic types of non-solution caves. In: Filippi, M. - Bosák, P., ed.: Proceedings, International Congress of speleology, 16th, 3, 237-242. - Brno.

Czudek, T. (1971): Geomorfologie východní části Nízkého Jeseníku. - Rozpr. Čs. Akad. Věd 81, 7, 80 str.

Czudek, T. (2005): Vývoj reliéfu krajiny České republiky v kvartéru. - 238 str. Morav. zem. muz. Brno.

Hromas, J., ed., et al. (2009): Jeskyně. In: Mackovčin, P. - Sedláček, M., ed.: Chráněná území ČR, sv. XIV. - 608 str. Agent. ochr. přír. kraj. ČR - EkoCentrum Brno. Praha.

Král, V. (1957): O některých pseudokrasových zjevech na Jesenicku. - Přírodověd. Sbor. Ostrav. Kraje 18, 2, 271-276.

Lenart, J. - Pánek, T. - Dušek, R. (2014): Genesis, types and evolution of crevice-type caves in the Flysch Belt of the Western Carpathians (Czech Republic). - Geomorphology 204, 459-476.View article

Selby, M. J. (1993): Hillslope Materials and Processes. - 480 str. Oxford Univ. Press. Oxford.

Schweigstillová, J. - Bruthans, J. - Falteisek, L. - Válek, J. (2013): Rychlá tvorba skalních kůr na povrchu hruboskalského pískovce: mikroskopický popis, tahová pevnost, odolnost vůči erozi, vznik a význam pro pískovcový reliéf. - Zpr. geol. Výzk. v Roce 2012, 228-234.

Skácel, J. (1961): Rozšíření křídového útvaru na Osoblažsku. - Přírodověd. Čas. slez. 22, 3, 367-373.

Soukup, J. - Bruthans, J. - Světlík, D. - Schweigstillová, J. - Smutek, D. (2013): Sebeorganizovaný systém otevřených puklin vzniklých prouděním podzemní vody v kvádrovém pískovci v lomu Střeleč. - Zpr. geol. Výzk. v Roce 2012, 296-304.

Vítek, J. (1978): Typy pseudokrasových jeskyní v ČSR. - Čs. Kras 30, 17-28.

Wagner, J. et al. (1988): Fenixovy jeskyně. Map. Dokumentace s řezy ze dne 12. 6. 1988.

Zapletal, L. (1966): Geomorfologie Osoblažské pahorkatiny. - Acta Univ. Palack. Olom., Geogr.-Geol. 7, 13-188.

Zapletal, L. - Kubalec, B. (1959): Geografie okresu Krnov. - 198 str. Odb. škol. kulturu rady ONV v Krnově. Krnov.