Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)
The sedimentary intercalations in the superficial volcanics of the Středohoří Complex and their influence on slope stability
Abstract
The large, roughly triangular, 1 km long and 800 m wide landslide of Čeřeniště in Rytina valley in the central part of České středohoří Mts. represents deep seated, probably 150 to 200 m thick area formed by rock debris. The detailed geological research was carried in the area to distinguish the role of several few metres thick sedimentary intercalations. They represent weathered volcanoclastics almost completely changed to smectites. Irregular tongues of red, fine-grained smectite infiltrations were observed and they indicate fossil (Tertiary-Lower Pleistocene) slope movements. The sediments occur as fossil soils (with rhizoconcretions), marshes and diatom muds. Thin high quality coal seam was observed (Tabs. 1 and 2). The sedimentary conditions resemble present day Rift valley where unesev surface of lava flows gives the origin to small shallow ponds and soil profiles. The sediments are probably an important factor influencing the sliding of the land masses and the formation of solifluctional terraces.
