Record details

Title
    Karbonátové tempestity v barrandienském středním devonu
Statement of responsibility
    Václav Suchý
Other titles
    Carbonate tempestites in the Barrandian Middle Devonian
Author
    Suchý, Václav
Language
    česky
Source title - monograph
    Horniny ve vědách o Zemi
Pages
    s. 77-105
Notes
    9 obr., 4 s.bibl.
    Anglické resumé
Subject group
    Barrandien
    devon-střední
    konference
    pražská pánev
    sedimentace šelfová
    sedimenty karbonátové
    tempestit
    textury sedimentů
Geographical name
    Choteč (Praha-západ)
    ČR-Čechy
    Hostim (Beroun)
    Praha-Hlubočepy
    Srbsko (Beroun)
Keyword
    Barrandienském
    Devonu
    Karbonátové
    Středním
    Tempestity
Abstract (in english)
   The Choteč Limestone representing the uppermost stratigraphic member of the carbonate development of the Barrandian Devonian was subject of detailed sedimentological study. Limestones comprise centimetre- to decimetre-thick, sheet-like beds of biodetrital limestone rhytmically interbedded with nodular micritic limestone and/or mudstone. Bipolar current marks and scour marks occur on the basal erosion surfaces of biodetrital limestones; their internal structures are hummocky cross strata of various styles, planar and graded laminae, and wave-ripple laminae, with typical lateral and vertical transitions among them. Nearly complete hummocky stratification sequences, which can serve a purpose similar to the Bouma sequence for turbidites, were observed in several units. The depositional environment is interpreted as a shallow-marine shelf periodically influenced by intense tropical or winter storms.
   Lateral transitions from coarse calciruditic limestones into calcisiltic and calcilutic storm layers, observed in a 25 km long SW-NE section of the Barrandian Devonian, demonstrate that these represent a continuous spectrum of genetically related rocks ranging from proximal to distal end members. The proximal to distal trend is expressed in decreasing bed thicknesses, degree of bed amalgamation, grain size, intraclasts and bioclasts content. Such a trend reflects the decreasing effects of storms toward deeper, offshore water and can be used for facies and paleobathymetric analysis
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    31. 3. 2008
Import date
    8. 8. 2012