Record details

    Depositional systems and sequence stratigraphy of coarse-grained deltas in a shallow-marine, strike-slip setting: the Bohemian Cretaceous Basin, Czech Republic
Statement of responsibility
    David Uličný
    Uličný, David
Source title - serial
    Vol. 48, no. 3
    p. 599-628
    13 obr., 2 fot., 3 s.bibl.
    Zkr. název ser.: Sedimentology
Subject group
    česká křídová pánev
    geometrie vrstevního tělesa
    sedimentace deltová
    stratigrafie sekvenční
    textury sedimentů
Geographical name
    Broumov (Náchod)
    Kokořín (Mělník)
    Liběchov (Mělník)
    Mšeno (Mělník)
    Police nad Metují (Náchod)
    Teplice nad Metují (Náchod)
    Turnov (Semily)
Abstract (in english)
   Deposits of coarse-grained, Gilbert-type deltas showing varying degrees of reworking of foresets by basinal currents were identified in Middle Turonian to Early Coniacian sandstones of the Bohemian cretaceous basin. The progradation of the deltaic packages, earlier interpreted as alrge-scale subaqueous dunes, shelf ridges or subaqueous fault-scarp "acumulation terraces", was controlled by a high- and low-frequency, relative sea-level changes in a relatively slowly subsiding, intracontinental strike-slip basin. End-member types of the Bohemian cretaceous coarse-grained deltas are deep-water deltas, characterized by thick (50-80 m) foreset packages with steep (10-30ř) foresets, and shallow-water deltas, which deposited thin (<15m) packages with foreset slope angle were controlled predominantly by the accomodation available during progradation.
   The depositional regime of the deltas was governed by (i) the fluvial input of abundant sand bedload, with a minor proportion of gravel; (ii) gravity flows, most probably caused by liquefaction of the upper part of the unstable foreset slope; and (iii) migration of sandy bedforms on the foreset slopes. The bedform migration was driven by unidirectional currents of possible tidal origin. Individual foreset packages represent systems tracts, or parts of systems tracts, of depositional sequences. A variety of stacking patterns of high-frequency sequences exists in the basin, caused by low-frequency relative sea-level changes as well as by local changes in sediment input
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    21. 3. 2008
Import date
    8. 8. 2012