Record details

    Climatic and biotic changes around the Carboniferous/Permian boundary recorded in the continental basins of the Czech Republic
    Mencl, V.
    Opluštil, S.
    Šimůnek, Z.
    Zajíc, Jaroslav
Publication type
    článek v odborném periodiku
Source title - serial
    International Journal of Coal Geology
    Roč. 119, č. 1
    s. 114-151
    Rozsah: 48 s. : E
    Výzkumný záměr: CEZ:AV0Z30130516
Subject category
    biotic change
    Bohemian Massif
    Carboniferous-Permian transition
    continental basin
Abstract (in english)
   An overview of a several decades-long study of transitional Carboniferous-Permian (Stephanian C-Autunian) sedimentary successions in continental basins of the Czech part of the Bohemian Massif is provided. These predominantly monotonous fluvial red beds intercalate with laterally widespread grey to variegated sediments of dominantly lacustrine origin. Both, fossil and climatic records show that apart from a generally known long-term climatic shift to drier conditions in Early Permian, the climate oscillated on several time scales throughout the study interval. Climatic indicators in the red beds part of the succession include palaeosols ranging between red vertisols and vertic calcisols suggesting strongly seasonal dry sub-humid climate.
   Periods of moist sub-humid (or even humid) climate were accompanied by formation of perennial lakes containing grey laminated mudstones, dark grey bituminous mudstones or limestones, muddy limestones, chert layers or even spatially restricted coals, some of them, however, of economic importance. Shorter climatic oscillations operating on a scale of tens to possibly hundreds of thousands of years are represented by transgressive-regressive lacustrine cycles followed by significant changes in lake water salinity reflected by boron content.The fossil record indicates the presence of dryland and wetland biomes in basinal lowlands although their proportions varied significantly as the climate changed. During deposition of red beds, the alluvial plain was vegetated dominantly by dryland biome assemblages. During the humid intervals parts of the basinal lowlands were occupied by lakes surrounded by broad belts of wetland biome floras.
   Local peat swamps were colonised by and even some lepidodendrid lycopsids. The response of lacustrine faunas to climatic oscillations around the Carboniferous-Permian transition is less prominent than that of plants.
    AV ČR Brno, Geologický ústav
Contributor code
    AV ČR, GLÚ
Source format
Import date
    23. 10. 2014