Record details

Title
    Combined tectonic-sediment supply-driven cycles in a Lower Carboniferous deep-marine foreland basin, Moravice Formation, Czech Republic
Statement of responsibility
    Ondřej Bábek, Radek Mikuláš, Jan Zapletal, Tomáš Lehotský
Author
    Bábek, Ondřej, 1969-
    Lehotský, Tomáš
    Mikuláš, Radek, 1964-
    Zapletal, Jan, 1939-
Language
    anglicky
Source title - serial
    International journal of Earth sciences (Geologische Rundschau)
Vol./nr.
    Vol. 93, no. 2
Pages
    p. 241-261
Year
    2004
Notes
    8 obr., 1 fot.
    Bibliografie na s. 258-261
    il.
    Zkr. název ser.: Int. J. Earth Sci. (Geol. Rdsch.)
Classfication no.
    551.2
Conspectus category
    55
Subject group
    cyklus sedimentační
    facie
    karbon-spodní
    kontrola tektonická
    moravskoslezské prevariské paleozoikum
    oblast snosová
    paleoproudění
    pískovce
    předhlubeň
    trace fossils
    turbidit
    vrásnění variské
Geographical name
    Bělkovice (Olomouc, Olomouc)
    ČR-Morava
    Domašov nad Bystřicí (Olomouc, Šternberk)
    Hrabůvka (Přerov, Hranice)
    Kružberk (Opava, Vítkov)
    Olšovec (Přerov, Hranice)
    Skoky (Přerov, Lipník nad Bečvou)
Keyword
    Basin
    Carboniferous
    Combined
    Cycles
    Czech
    Deep-marine
    Foreland
    Formation
    Lower
    Moravice
    Republic
    Supply-driven
    Tectonic-sediment
Abstract (in english)
   The Lower Carboniferous Moravian-Silesian Culm Basin (MSCB) represents the easternmost part of the Rhenohercynian system of collision-related, deep-water foreland basins (Culm facies). The Upper Viséan Moravice Formation (MF) of the MSCB shows a distinct cyclic stratigraphic arrangement. Two major asymmetric megacycles bounded by basal sequence boundary, each about 500 to 900 m thick, have been revealed. The megacycles start with 50- to 250-m-thick, basal segments of erosive channels: overbank successions and slope apron deposits interpreted as lowstand turbidite systems. Up-section they pass into hundred metre-thick, fine-grained, low-efficiency turbidite systems. Palaeocurrent data show two prominent directions, basin axis-parallel, SSW-NNE directions, which are abundant in the whole MF, and basin axis-perpendicular to oblique, W-E to NW-SE directions, which tend to be confined to the basal parts of the megacycles or channel-lobe transition systems in their upper parts.
   Based on the facies characteristics, palaeocurrent data, sandstone composition data and trace-fossil distribution data, we suggest a combined tectonics-sediment supply-driven model for the MF basin fill. Periods of increased tectonic activity resulted in slope oversteepening probably combined with increased rate of lateral W-E sediment supply into the basin, producing the basal sequence boundary and the subsequent lowstand turbidite systems. During subsequent periods of tectonic quiescence, the system was filled mainly from a distant southern point source, producing the thick, low efficiency turbidite systems. Consistently with the previous models, our own sediment composition data indicate a progressively increasing sediment input from high-grade metamorphic and magmatic sources up-section, most probably related to an uplift in the source area and progressive unroofing of its structurally deeper crustal parts.
   The first occurrence of the Cruziana-Nereites ichnofacies in sandrich turbidite systems in the youngest parts of the MF (Gobetael to Gobetaspi Zone), supported by rapidly increasing quartz concentrations in sandstones, is thought to indicate a transition from generally underfilled to generally overfilled phase in evolution of the MSCB basin. This transition may be linked to the onset of Upper Viséan phase of northward basin-fill progradation assumed by previous authors
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    7. 4. 2008
Import date
    8. 8. 2012