Podrobnosti záznamu

Název
    The evolution of karst and caves in the Koněprusy region (Bohemian Karst, Czech Republic), Part III: Collapse structures
Autor
    Bosák, Pavel
Jazyk
    anglicky
Typ dokumentu
    část monografie (kapitola)
Zdrojový dokument - monografie
    Acta carsologica
Strany
    s. 35-50
Poznámky
    Rozsah: 16 s.
    Výzkumný záměr: CEZ:AV0Z3013912
Předmětová kategorie
    collapse
    hydrothermal karstification
    paleokarst
Klíčové slovo
    Bohemian
    Caves
    Collapse
    Czech
    Evolution
    III
    Karst
    Koněprusy
    Region
    Republic
    Structures
Abstrakt (anglicky)
   Vertical and subvertical pipes are circular to ovate in shape with diametres from 2-4 m up to tens of metres and with proven depth up to 82 m. Some of them terminate by horizontal cave levels at depth. Pipes are filled with complicated sedimentary sequences with clearly developed collapse structures. The fill is composed of pre-Cenomanian, Cenomanian-Turonian and Tertiary deposits. Internal structures of the fill indicate multiphase collapses. Cretaceous and pre-Cretaceous deposits are often subvertical with chaotic internal texture. In the centre of some of pipes, there are traces of younger collapses, most probably induced by continuing karstification and suffosion at depth. Tertiary deposits overlay the Cretaceous ones unconformably; they show gentler centripetal inclination, but in places they fill the central parts of collapsed fill.
   The origin of solution pipes is connected with hydrothermal activity most probably during Paleogene to Miocene, when the surface of limestones was still covered by slightly eroded cover of Upper Cretaceous platform sediments. Hydrothermal karst forms developed up to the surface of limestones as the piezometric level was situated within the Cretaceous cover. After the lost of buoyancy support of water, sedimentary cover started to move (collapse) down.
Přispěvatel
    AV ČR Brno, Geologický ústav
Kód přispěvatele
    AV ČR, GLÚ
Zdrojový formát
    U
Datum importu
    8. 8. 2012