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    Wyświetlanie 1-2 z 2
    Tytuł:
    Rozwój strefy glacimarginalnej na przedpolu Beskidu Śląskiego (dział bielski Pogórza Śląskiego)
    Evolution of the glaciomarginal zone in the Silesian Beskid foothill (Bielsko division of the Silesian Foothills)
    Autorzy:
    Salamon, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075125.pdf
    Data publikacji:
    2014
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    glaciomarginal zone
    glaciolacustrine sedimentation
    Sanian Glaciation
    Carpathian Foothill
    strefa glacimarginalna
    sedymentacja glacialna
    zlodowacenie
    Pogórze Śląskie
    Opis:
    The paper presents the succession of Sanian Glaciation sediments recognized in the Swiętoszówka site, Southern part of the Silesian Foothills (Bielsko division). The following deposits were found: a unit ofgravels deposi- ted in a system offoremountain alluvialfans, a unit of silts deposited in a glaciomarginal dammed lake, and a glacial till. Glaciogenic deposits are covered with loess-like deposits. The development of the glaciomarginal zone was influ- enced mainly by the pattern ofbasement relief. In the northern part of the foothill, in the northward-oriented valleys, glacially dammed lakes were mainlyformed. During transgression, waterfrom these reservoirs was pushed in front of the ice-sheet margin towards the southern part of the low-relieffoothill. The individual lakes probably merged there into one larger glaciomarginal lake. It was characterized by low-energy conditions and deposition mainly from suspension. Sedimentation style in the lake changed over time and was dependent on the size and shape of the lake and its position in relation to the ice-sheet margin, which determined thewidth and distribution ofzones of sediment supply and the dynamics ofdepositional processes in the lake.
    Źródło:
    Przegląd Geologiczny; 2014, 62, 2; 103--110
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ewolucja systemu hydrograficznego i szaty roślinnej dorzecza górnej Piławy i górnej Drawy (Pomorze Środkowe)
    Evolution of the hydrographic system and vegetation in the drainage basin of the upper Piława and the upper Drawa Rivers (Middle Pomerania)
    Autorzy:
    Lewandowski, J.
    Nita, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074614.pdf
    Data publikacji:
    2008
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    kotliny wytopiskowe
    limnoglacialne zagłębie
    osady kredy
    analiza pyłkowa
    pomiary radiometryczne
    dead-ice melting
    glaciolacustrine basins
    lacustrine deposits
    pollen analysis
    radiometric measurements
    Opis:
    Highly varied hydrographic system occurs in the drainage basins of the upper Piława, Płytnica and Drawa Rivers (Middle Pomerania). Numerous radiometric dating carried out by the methods of 14C, OSL and U/Th, as well as pollen analyses and geomorphological analysis enable to study evolution of the system in the period of the last twelve thousand years. Glaciolacustrine deposits, accompanying most of the lakes, represent accumulation, which took place at the initial stage of the lacustrine basin formation. The level of lacustrine waters fell by several to more than a twelve meters in that time and was controlled by melt water runoff channeled through valleys in the southern direction. The final stage of the lake development was connected with complete melting of buried dead-ice masses and formation — bottoms of lake. Evolution from glaciolacustrine to lacustrine basins within kettles was continuous process. Lake water level started to fall abruptly when the last remnants of the dead ice blocking the runoff have melted and the inter-lake channels have been erosionaly deepened. That phase should be related to the complete decay of permafrost, probably at the end of the Allerřd. The main phase of erosion in the gorges started at the end of the Pleistocene and lasted (with lower intensity) till the Pre-Boreal and/or the Boreal. The water level in the lake system drained by the Piława and the Drawa Rivers was finally fallen by 8–16 meters and for a long time was stabilized (during the Atlantic and Sub-Atlantic) at the level of 2 meters higher than the present one. Further lowering of drained lakes by the next 2 meters was probably caused by anthropogenic activities resulting from intensive colonization in the 16th and 17th centuries and later by land improvement accomplished in the drainage basins of the Drawa and the Piława Rivers in the 19th century. Local conditions strongly influenced character of forest communities in the area investigated. The tendency was especially significant in the Atlantic. Increased importance of pine trees in the vicinity of the Lędyczek site caused that broadleaf forests with oak, maple, lime and hazel trees, typical of the Atlantic, have not developed there.
    Źródło:
    Przegląd Geologiczny; 2008, 56, 5; 380-380
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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