Record details

Title
    The nannofossil chalk layers in the Early Oligocene Šitbořice Member in Velké Němčice (The Menilitic Formation, Ždánice Unit, south Moravia): orbitally forced changes in paleoproductivity
Statement of responsibility
    Jan Krhovský, Milena Djurasinovič
Other titles
    Nové výsledky v terciéru Západních Karpat : sborník referátů z 10. konference o mladším terciéru : Brno 27. - 28. 4. 1992 (Variant.)
Author
    Djurasinovič, Milena
    Krhovský, Jan, 1947-
Language
    anglicky
Source title - serial
    Knihovnička Zemního plynu a nafty
Vol./nr.
    Vol. 15
Pages
    p. 33-53
Year
    1993
Notes
    2 obr., 2 pl.
    il.
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Knih. Zem. Plynu Nafty
Classfication no.
    551.7
    56
Conspectus category
    55
    56
Subject group
    biostratigrafie
    flyš
    flyšové pásmo Západních Karpat
    Foraminifera
    geologie regionální
    litostratigrafie
    nannofosílie
    oligocén
    paleoekologie
    terciér
    vápnitost
    vnější skupina příkrovů flyšového pásma
Geographical name
    ČR-Morava
    Velké Němčice (Břeclav, Hustopeče)
Keyword
    Chalk
    Changes
    Early
    Forced
    Formation
    Layers
    Member
    Menilitic
    Moravia
    Nannofossil
    Němčice
    Oligocene
    Orbitally
    Paleoproductivity
    South
    Šitbořice
    Unit
    Velké
    Ždánice
Abstract (in english)
   In the Velké Němčice section, laminae and thin layers of nannofossil chalks were studied in the Silbofice Member (late NP 23, NP 24 Biochrones). In the lower part of the member, horizon with frequent Reticulofenestra lockeri, Coccolithus pelagicus, Helicosphaera recta and Zygrhablithus bijugatus was found; Trahsversopontis pygmaeus is characteristic there. In it? middle part, Reticulofenestra lockeri and Pontosphaera latelliptica are abundant In the upper part, a thin layer with abundant Dictyococcites hesslandii and common cyclicargoliths, Braarudospahaera bigelowii and Dictyococcites bisectus was ascertained. Two thicker layers of nanno-chalk near the top of the member contain abundant cyclicargoliths and are correlatable with the Jaslo and Zagórz Limestones from the Polish Carpathians.
   Three layers of sideritic dolomitized carbonates in the middle part of the section, originated supposedly by dolomitization of nanno-chalk layers, are tentatively correlated with the upper horizons of the Tylawa Limestones.The blooms of calcareous nannofossils are supposed to have occurred at time of two environmental conditions coincidence: 1) renewed communication between semi-isolated Flysch basins and an open sea due to the high sea-level stand, with the salinity rise as a consequence, and 2) high run-off supplying a photic zone with nutrients. The spatial regularity in distribution of the nanno-chalks in the section reflects regular paleoenvi-ronmental changes with suspected orbital forcing
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    16. 1. 2009
Import date
    8. 8. 2012