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Wyszukujesz frazę "lithofacies" wg kryterium: Temat

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    Wyświetlanie 1-2 z 2
    Tytuł:
    An application of Markov chain analysis to studies on lithofacies sequences in the alluvial fans from the "Bełchatów" lignite deposit (Poland
    Zastosowanie analizy łańcuchów Markowa do badań sekwencji litofacji w stożkach napływowych w złożu węgla brunatnego "Bełchatów"
    Autorzy:
    Mastej, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/191575.pdf
    Data publikacji:
    2002
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    Markov chain analysis
    vertical lithofacies succession
    Bełchatów lignite deposit
    alluvial fans
    lacustrine limestones
    Opis:
    The Markov chain analysis was used to study on lithofacies sequences in alluvial fans enclosed in the main seam of the "Bełchatów" lignite deposit. Quantitative approach supported the qualitative results of sedimentological analysis - the origin of muds, clays and coaly clays as well as the presence of a barrier (peat bog) between the fans and the lake with carbonate deposition. It was found that ephemeral lakes located on the fan surface were favourable sites for development of peat bogs. Similarly, the same lakes evolving into the peat bogs were favourable environments for expansion of sand lobes of the fans. It was discovered that cyclicity in sediment succession was disturbed by erosion. The new model of lacustrine limestone deposition was proposed for the northwestern part of lake which borders the fans from the northwest.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2002, 72, No 3; 271-282
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of lithofacies cyclicity in the Miocene Coal Complex of the Bełchatów lignite deposit, south-central Poland
    Autorzy:
    Mastej, W.
    Bartuś, T.
    Rydlewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/94646.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    Markov chain
    method
    cyclic sedimentation
    vertical succession of lithofacies
    łańcuchy Markowa
    metoda
    cykliczna sedymentacja
    litofacja
    Opis:
    Markov chain analysis was applied to studies of cyclic sedimentation in the Coal Complex of the Bełchatów mining field (part of the Bełchatów lignite deposit). The majority of ambiguous results of statistical testing that were caused by weak, statistically undetectable advantage of either cyclicity over environmental barriers or vice versa, could be explained if only the above-mentioned advantages appeared in the neighbourhood. Therefore, in order to enhance the credibility of statistical tests, a new approach is proposed here in that matrices of observed transition numbers from different boreholes should be added to increase statistical reliability if they originated in a homogeneous area. A second new approach, which consists of revealing statistically undetectable cyclicity of lithofacies alternations, is proposed as well. All data were derived from the mining data base in which differentiation between lithology and sedimentary environments was rather weak. For this reason, the methodological proposals are much more important than details of the sedimentation model in the present paper. Nevertheless, they did reveal some interesting phenomena which may prove important in the reconstruction of peat/lignite environmental conditions. First of all, the presence of cyclicity in the sedimentation model, i.e., cyclic alternation of channel and overbank deposits, represents a fluvial environment. It was also confirmed that the lacustrine subenvironment was cut off from a supply of clastic material by various types of mire barriers. Additionally, our analysis revealed new facts: (i) these barriers also existed between lakes in which either carbonate or clay sedimentation predominated; (ii) there was no barrier between rivers and lakes in which clay sedimentation predominated; (iii) barriers were less efficient in alluvial fan areas but were perfectly tight in regions of phytogenic or carbonate sedimentation; (iv) groundwater, rather than surface flow, was the main source of CaCO3 in lakes in which carbonate sedimentation predominated; (v) a lack of cyclic alternation between abandoned channels and pools with clayey sedimentation; (vi) strong evidence for autocyclic alternation of phytogenic subenvironments and lakes in which carbonate sedimentation predominated was found in almost all areas studied.
    Źródło:
    Geologos; 2015, 21, 4; 285-302
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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