Record details

Title
    Coal clasts in the Bolsovian (Westphalian C) sequence of the Kladno-Rakovník continental basin (Czech Republic): implications for the timing of maturation
Statement of responsibility
    Vilém Daněk, Jiří Pešek, Pavla Valterová
Other titles
    Proceedings of the IV European Coal Conference, September 26-28, 2000, Ustroń, Poland (Variant.)
Author
    Daněk, Vilém
    Pešek, Jiří, 1936-
    Valterová, Pavla
Language
    anglicky
Source title - serial
    Polish geological institute special papers
Vol./nr.
    Vol. 7
Pages
    p. 63-78
Year
    2002
Notes
    1 diagr., 5 tab., 3 pl.
    il.
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Pol. geol. Inst. spec. Pap.
Classfication no.
    55(1)
    551.7
    552
Conspectus category
    55
    552
Subject group
    analýza petrografická
    časový faktor
    karbon-svrchní
    kladensko-rakovnická pánev
    klast
    konference
    miospory
    prouhelnění
    sedimenty bohaté organickým uhlíkem
    středočeské svrchní paleozoikum
    uhlí bituminózní
Geographical name
    ČR-Čechy
    Kladno
    Rakovník
Keyword
    Basin
    Bolsovian
    Clasts
    Coal
    Continental
    Czech
    Implications
    Kladno-Rakovník
    Maturation
    Republic
    Sequence
    Timing
    Westphalian
Abstract (in english)
   Angular coal clasts confined to coarse-grained feldspathic sandstone deposited in the Tuchlovice Mine pit in the Kladno-Rakovník basin were studied. These fragments of various orientation consisting of banded, dull and bright coal of Bolsovian age (=Westphalian C) occur as an admixture being some tenths of a millimetre up to 40x30x20 mm large. The clasts are coalified into high volatile bituminous coal showing an average reflectance corresponding to vitrinite (Rr = 0.64 per cent). They reveal no signs of progressing diagenetic changes after their redeposition. Some clasts exhibit cracks filled with clay minerals, which constitute common admixture in coal seams of this basin. Cracks do not extend into the adjacent sediment. Their origin is connected with coalification processes in original coal seam, which occurred prior to erosion. The investigation of miospores showed that the coal clasts come from the eroded Lubna coal seams of Bolsovian age.
   Since the Radnice Member is the oldest unit of the central and west Bohemian basins, the coalification of organic matter into high volatile bituminous coal must have occurred within this member, i.e., during some hundred thousand years at a depth of only a few tens, maximum first hundred metres. The achieved results argue for a high paleotemperature gradient, which must have existed during the Carboniferous in the Bohemian Massif. Similar conditions are known, e.g., from South Wales basin in UK (Gayer et al., 1996) and from the Upper Silesian basin (Kožušníková et al., 1999)
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    27. 11. 2008
Import date
    8. 8. 2012