Podrobnosti záznamu

Název
    Climatic oscillations versus environmental changes in the interpretation of Tertiary plant assemblages
Údaj o odpovědnosti
    Zlatko Kvaček
Další názvy
    Climates: Past and Present (Variant.)
Autor
    Kvaček, Zlatko, 1937-
Jazyk
    anglicky
Zdrojový dokument - seriál
    Geological society special publication
Svazek/č.
    Vol. 181
Strany
    p. 89-94
Rok
    2000
Poznámky
    5 tab., 29 bibl.
    il.
    Zkr. název ser.: Geol. Soc. spec. Publ. (London).
Předmětová skupina
    Angiospermophyta
    Coniferales
    diatomit
    listy
    miocén-spodní
    oligocén
    paleoekologie
    sedimentace fluviolakustrinní
    severočeská pánev
    tafonomie
    terciér
    vegetace
    vulkanity Českého středohoří
    změna klimatu
Geografické jméno
    Bechlejovice (Děčín)
    Bílina (Teplice)
    ČR-Čechy
    Litvínov (Most)
    Suletice (Ústí nad Labem)
Klíčové slovo
    Assemblages
    Changes
    Climatic
    Environmental
    Interpretation
    Oscillations
    Plant
    Tertiary
Abstrakt (anglicky)
   Zonal plant communities are the best climatic indicators because they thrive under specific climatic conditions. However, palaeoclimatic estimates based on mere comparisons of local fossil plant assemblages, even if assessed by multivariate methods, may be misleading, if the taphonomical bias is neglected. The fossil record expressed only limited parts of the vegetation of a given period. The example of the Lower Miocene section at Bílina, North Bohemian basin, showns how quickly the composition of the plant megafossil record changes as a result of different environmental factors and sedimentary setting. These changes can imitate climatic oscillation because swamp, fluvial and upland facies represented within this site have different vegetation-palaeoclimatic aspects. On the other hand, if one compares two assemblages originating from the same sedimentary and environmental setting (preferably mesophytic conditions), the resulting palaeoclimatic changes can be estimated more safely.
   two local assemblages from the Oligocene volcanic area of the České středohoří Mts in North Bohemia are of mesophytic character. Both are embedded in diatomites deposited in crater-maar lakes. the assemblages of Suletice (20-29 Ma), with prevailing thermophilous elements, indicates more warm-temperature conditions, whereas the assemblage of Bechlejovice (27 Ma), composed mostly of deciduous broadleaved trees and shrubs, corresponds to a temperate climate. Thus, together, these two floral assemblages suggest that a climatic oscillation occurred within Late Oligocene time in Central Europe
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    28. 3. 2008
Datum importu
    8. 8. 2012