Publication details
Krasové jevy v horninách bělohorského souvrství (turon, česká křídová pánev) z lomu Březinka u Letovic
| Title in English | Carstic features in rocks of the Bílá Hora Formation (Turonian, Bohemian Cretaceous Basin) from the Březinka quarry near Letovice |
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| Authors | |
| Year of publication | 2014 |
| Type | Article in Periodical |
| Magazine / Source | Geologické výzkumy na Moravě a ve Slezsku |
| MU Faculty or unit | |
| Citation | |
| Field | Geology and mineralogy |
| Keywords | Bohemian Cretaceous Basin;Orlice-Žďár development;kartsology;speleothemes |
| Description | Pseudokarstic features are common in clastic sediments at many places of the Bohemian Cretaceous Basin. Occurrences of karstic features which are naturally linked to calcareous sediments are less usual or rather rare. Probably the most extended is the tiny-scale Miskovice Karst near Kutná Hora, where macroforms occur. In the Bohemian Paradise were documented karstic features of lesser extent in pseudokarstic caves and known are as well from the Tichá Orlice and Svitava rivers valleys. Small-sized occurrence of karstic phenomena were found during recent mapping works in the surrounding of Letovice (W Moravia) in the Březinka quarry near Březová n. S. just above the base of the Early Turonian Bílá Hora Formation. The karstic features are of a speleotheme character and are represented mainly by sinter crusts, tubercular sinters, concentric spheroidal aggregates and straws. The occurrence of concentric aggregates is connected with primary breccia cavities and, on the other hand, a rest of the karstic features occurs mainly in the cavities of corrosive character. Based on such observation we preliminary interpret the genesis of the secondary carbonate in two distinct phases. A crystallization of the concentric aggregates was connected with primary cavities environment which were probably restricted to exogenous influences. Sinters, straws and other karstic features were generated during a second phase, characterized by influence of normal exogenous karstic processes. |