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

KARSTIFICATION

Fig. 55. Postgenetic karstification in the interior of true depression (tributary of Tábla Valley at postgenetic dolines-with-ponor 1-22 and 1-102) Legend: 1. contour in local system; 2. cover sediment; 3. assumed margin of well-developed superimposed valley; 4. assumed margin of developing regressional-superimposed valley; 5. large depression; 6. postgenetic doline-with-ponor; 7. erosional channel Karstification of terrains with valley formation after cavernation On block or groups of blocks which remained in low positions for a longer time, karst water table was located on the boundary between cover sediments and the carbonate rock (Fig. 57). An evidence for this is eg. the gravel fill of the solution chimney on the ceiling of cave no M-7 and the gravels found in passages opening onto the surface. Cover sediments forced karst water to flow laterally. The water deriving from cover sediments also contributed to solution and cavernation (buried karst). In the karst water zone karst water moves in two basic directions. A predominantly horizontal movement occurs in abraded conglomerates, marl series and in a thinned-out Eocene limestone overlying dolomite. Further away from these sites, particularly if the enclosing block is uplifted, water flow becomes increasingly vertical. In the previously mentioned sites cavities develop in diverse horizontal directions, in accordance with flow, while in the latter sites directions are less diverse and mostly vertical cavities form. During the further uplift of the enclosing block cover sediments are removed. The incising regressional-superimposed valleys (postgenetic valleys) partly destroy and partly expose cavities. If the ceilings of subsurface cavities