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    Wyświetlanie 1-4 z 4
    Tytuł:
    Petrographical analysis of Warthian fluvioglacial gravels as a tool to trace the source area – a case study from central Poland
    Autorzy:
    Górska-Zabielska, M.
    Wachecka-Kotkowska, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/94704.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    gravel petrography
    indicator erratics
    fluvioglacial deposits
    Warthian stadial
    central Poland
    żwirowa petrografia
    eratyki przewodnie
    osady fluwioglacjalne
    centralna Polska
    Opis:
    The petrographical features of the medium- and coarse-grained gravels (4-10 mm and 20-60 mm, respectively) of weathered and fresh (unweathered) deposits indicate, in combination with so-called indicator and statistical erratics, that two glacial lobes joined in the borderland of the Polish Lowlands and Uplands. Lower Palaeozoic limestones become less frequent in the finer gravel fraction, whereas crystalline rocks and flints become more frequent. The petrographical analysis of the coarser gravel fraction indicates that the ice sheet advanced from the NE to NNW (the Widawka lobe) and from the NE to ENE (the Rawka, Pilica and Luciąża lobes). The source areas of the gravel deposited by the Warthian ice sheet were magmatic and sedimentary areas of both the Baltic and the SE Sweden basins.
    Źródło:
    Geologos; 2014, 20, 3; 183-199
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Is the Charlottenthal fan (marginal zone of the Pomeranian phase, NE Germany) an end moraine?
    Autorzy:
    Pisarska-Jamroży, Małgorzata
    Börner, Andreas
    Powiązania:
    https://bibliotekanauki.pl/articles/94327.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    transitional fan
    glaciofluvial sediment
    gravel petrography
    Weichselian glaciation
    Pomeranian Phase
    NE Germany
    osady fluwioglacjalne
    żwiry petrograficzne
    Pomorze
    północne Niemcy
    Opis:
    The maximum ice-sheet extent of a glaciation or glacial phase is in most cases indicated by the position of end moraines. In some cases, however, the maximum extent of the ice sheet is indicated by a fan which represents the transitional zone between the end moraine and the proximal outwash plain (sandur). Such a fan from the Pomeranian phase near Charlottenthal in NE Germany has been investigated for its lithofacies, and the depositional mechanisms of the two sedimentary environments (end moraine and outwash plain) are reconstructed. The Charlottenthal profile is not characteristic in a sedimentological sense of a typical marginal end moraine or a sandur. The deposits represent subaerial debris flows, sheet floods and channelized currents, which are typically processes for transitional fan. Gravel samples from the till complex show typical Weichselian till compositions. These till compositions indicate a general transport direction from North to South, which is consistent with the known movement of the ice sheet during the Pomeranian phase of the Weichselian.
    Źródło:
    Geologos; 2011, 17, 1; 17-28
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gierałtów versus Śnieżnik gneisses - what is the real difference?
    Autorzy:
    Redlińska-Marczyńska, Aleksandra
    Powiązania:
    https://bibliotekanauki.pl/articles/94442.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    Śnieżnik gneiss
    Gierałtów gneiss
    structural analysis
    petrography
    West Sudetes
    Polska
    Śnieżnik
    gnejs
    Gierałtów
    analiza strukturalna
    petrografia
    Sudety zachodnie
    Polska
    Opis:
    Structural and petrographic study applied to the gneisses from the eastern part of the Orlica-Śnieżnik Dome, indicate that two different types of gneiss are present. The Śnieżnik gneisses are porphyrithic granites, constricted and sheared into L-S tectonites, most commonly with augens; the Gierałtów gneisses are sheared migmatites, porphyroblastic gneisses and banded gneisses, with two sets of metamorphic foliation, intrafolial folds and lensoid leucosome aggregates or metamorphic porphyroblasts. Both lithologies were later zonally sheared and transformed into more or less deformationally advanced mylonites, difficult to be distinguished from one of the two types. Identification of the Śnieżnik and Gierałtów gneisses is possible only between zones of the late (Variscan) shearing, in which the original, pre-kinematic structures are preserved.
    Źródło:
    Geologos; 2011, 17, 2; 71-96
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unravelling the complex nature of the Upper Weichselian till section at Gdynia Babie Doły, northern Poland
    Autorzy:
    Woźniak, P. P.
    Czubla, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/94576.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    subglacial processes
    till fabric
    till petrography
    Gulf of Gdańsk
    Pleistocene
    Fennoscandian Ice Sheet
    procesy podlodowcowe
    Zatoka Gdańska
    Pleistocen
    pokrywa lodowa
    Opis:
    The complexity of glacial sequences may increase when these formed underneath ice sheets despite subsequent changes in their extent that are accompanied by alterations in the direction of the ice flow. Our aim was to determine whether or not changes in ice sheet dynamics during the Late Weichselian are also recorded in sediments formed north of the area of its fluctuating margin (i.e., where the ice sheet prevailed independent of such fluctuations). It is shown that in these areas such a record could have occurred, as documented by results of till studies at Babie Doły. The examination was carried out using several analyses: lithofacies properties of sediments, petrographic till composition (fine gravel fraction, indicator erratics), till matrix CaCO3 content, till fabric, as well as orientation of striae on the top surfaces of large clasts. In parallel, datings of sub- and supra-till sediments using the TL method were carried out. The basal till at Babie Doły represents almost the entire Upper Weichselian, but it can be divided into subunits whose features indicate different ice flow directions and debris supply. The lower subunit developed as a result of the palaeo-ice stream along the main axis of the Baltic Sea (from the north), expanding to areas adjacent to the depression of the Gulf of Gdańsk. The upper subunit developed when the influence of the palaeo-ice stream in the study area decreased, the main role having been taken over by the ice flowing from the northwest. The till analysed also shows considerable lateral variation, indicative of the mosaic nature of subglacial sedimentation. We consider the diversity of permeability of deposits over which the ice sheet extended to be the prime factor that determined such a situation.
    Źródło:
    Geologos; 2016, 22, 1; 15-32
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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