Record details

Title
    Sedimentology, coal petrology and palynology of the Radnice Member in the S-E part of the Kladno-Rakovník Basin, Central Bohemia (Bolsovian)
Statement of responsibility
    Stanislav Opluštil, Ivana Sýkorová, Jiří Bek
Author
    Bek, Jiří
    Opluštil, Stanislav, 1962-
    Sýkorová, Ivana, 1969-
Language
    anglicky
Source title - serial
    Acta Universitatis Carolinae. Geologica
Vol./nr.
    Vol. 43, no. 4
Pages
    p. 599-623
Year
    1999
Notes
    6 obr., 4 tab., 4 s.bibl.
    Zkr. název ser.: Acta Univ. Carol., Geol.
Subject group
    palynologie
    pánev kladensko-rakovnická
    sedimentologie
    uhelná petrologie
Keyword
    Basin
    Bohemia
    Bolsovian
    Central
    Coal
    Kladno-Rakovník
    Member
    Palynology
    Petrology
    Radnice
    S-E
    Sedimentology
Abstract (in english)
   Coal-bearing strata of the Radnice Member fill incised or tectonically formed river valley. They were deposited during a short interval approximately coinciding with the Lower Bolsovian. Besides local tectonics, compaction and presedimentary paleotopography the deposition was controlled by regional tectonic subsidence described in term of base-level changes. It was responsible for formation of level rise are marked by development of extensive peat bogs occassionally grading upward into lake during the maximum base-level rise. The most important base-level fall led to a short-term hiatus and varying depth of erosion of previously deposited sediments. Resulting erosional surface with significant relief of max. 20 m divides the Radnice members. Lower unit (Lower Radnice Member) is marked by the upward transition from colluvial and period of maximum base-level rise. Filling of the lake was followed by a short-term hiatus and erosion due to a rapid base-level fall.
   Upper flood-plain deposits are poorly developed (?preserved(. The periods of maximum base-level rise marked by the presence of overbank deposits locally passing into coal seams of the Lubná Group. Mineable coal seams are developed only in minor depressions with low rate of clastic input due to paleontology configuration ("sedimentary shadows") The proposed scheme is valid for incised valleys of the SE part of the Kladno-Rakovník Basin where the regional sectonic subsidence was the main mechanism controlling deposition of this unit. Its validity in valleys with simálar tectonic setting outside the study area has to be proved yet. However, this model is not applicable to the NNE-trending grabens driven by local tectonics, which occur in the axial part of the Plzeň Basin and Rakovník part of the Kladno Rakovník Basin. The studied coal seams formed in rheotrophic mires with open water table or with the water table corresponding to the peat surface and with high to limited clastic input
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    14. 1. 2008
Import date
    8. 8. 2012