Veress Márton: A Bakony természettudományi kutatásának eredményei 23. - Covered karst evolution... (Zirc, 2000)

KARSTIFICATION

y. . : . CD CD CD) CD> > ÇZ5> CD .O.t CD CD CD CD. CD]' B ^ rsj Lo]5 £=)n Fig. 17. Development of pseudodepressions of various morphology during exhumation of the broader environment through stream erosion Legend: I. initial stage; II. later stage; a. no depression formation, the regressional valley retreats between the rows of cones; b-c. the retreat of the regressional valley is hindered by a row of cones, formation of elongated depression (b. with rows of depressions of variable activity; c. with rows of depressions of similar activity); d. the regressional valley is enclosed by several rows of cones, depressions on both sides of the valley, e. cones are not arranged in rows, irregular depression results. I. cover sediment; 2. outcrop of carbonate rock in valley incising into cover sediment; 3. regressional valley; 4. buried cone; 5. row of semiexhumed cones; 6. depressions in various stages of development; 7. active karst landform of syngenetic karstification (doline-with-ponor); 8. non-active (fossilised) karst landform of syngenetic karstification; 9. slope of the broader environment; 10. slope of depression floor; II. material transport in regressional valley karst feature acquires a summit position within the depression. As cover sediments are thinning out, in the immediate surroundings of the karst feature renewed karstification begins. All these may result in the rearrangement of the paths of sediment removal and thus slope directions within the depression. Depressions are similar to alluvial streamsink dolines. The main difference between the two types is that matter from the depression is removed into one or more passages formed within the depression and in the case of alluvial streamsink dolines the basin forms above the passage into which sediment is transported. In the latter case the surface of denudation (the basin) and of accumulation (the passage) are not distinct from each other as in the case of depressions. Postgenetic karst features form in (true) depressions or independent of depressions. Postgenetic karst features form in fills of depressions which are of the same age with the karst passage. Postgenetic karstification and karst feature is independent of the depression if it develops in cover sediments which are not fills of surface karst depression. A pseudopostgenetic karst fearture forms if a covered karst feature in the cover sediments of a karst depression to the influence of the exposure of an independently developed karst passage.