Počet záznamů: 1  

Acta carsologica

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    0145287 - GLU-S 20013072 RIV SI eng M - Část monografie knihy
    Bosák, Pavel
    The evolution of karst and caves in the Koněprusy region (Bohemian Karst, Czech Republic), Part III: Collapse structures.
    Acta carsologica. Inštitut za raziskovanje krasa, s. 35-50
    Výzkumný záměr: CEZ:AV0Z3013912
    Klíčová slova: paleokarst * hydrothermal karstification * collapse
    Kód oboru RIV: DB - Geologie a mineralogie
    https://ojs.zrc-sazu.si/carsologica/article/view/447

    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.
    Trvalý link: http://hdl.handle.net/11104/0042897

     
     

Počet záznamů: 1  

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