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    Wyświetlanie 1-3 z 3
    Tytuł:
    Asynchronous development of two Late Glacial lake basins near the Drwęca ice-marginal valley (N Poland)
    Autorzy:
    Gamrat, W. W.
    Błaszkiewicz, M.
    Andrzejewski, L.
    Krześlak, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060377.pdf
    Data publikacji:
    2017
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Palaeolakes
    buried dead ice
    Plenivistulian
    Late Glacial
    Holocene
    northern Poland
    Opis:
    Lacustrine organic sediments were sampled at Gronowo (Chełmno Plateau) and Piotrkowo (Dobrzyń Plateau) located within a widespread system of subglacial channels separated by the large Drwęca ice-marginal valley. They have been examined for their pollen, plant macro-remains and geochemistry, as well as radiocarbon-dated. The analyses have allowed reconstructing the evolution of the area and presenting an asynchronous appearance of two lakes. Before lake sedimentation, glaciolimnic sediments from the end of Plenivistulian, at the site of Piotrkowo, was dated. Lacustrine sedimentation started during the Allerød at Gronowo, and during the Preboreal at Piotrkowo. The different age of the two lakes is ascribed mainly to differences in the Late Glacial drainage conditions which directly affected the melting away of dead-ice blocks buried in the channels.
    Źródło:
    Geological Quarterly; 2017, 61, 2; 450--464
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Jeziora i torfowiska w Dolinie Suchej Wody w Tatrach i ich geneza wytopiskowa
    Lakes and peat-bogs in the SuchaWoda Valley in the Tatra Mountains and theirs melt genesis
    Autorzy:
    Derkacz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074411.pdf
    Data publikacji:
    2006
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    forma wytopiskowa
    torfowisko
    Tatry
    dead-ice depressions
    peat bogs
    retreat of glacier
    Tatra Mts.
    Opis:
    Out of the 85 cavings located in the northern part of the SuchaWoda Valley (Polish Tatra Mountains), the majority are probably dead-ice depressions. Their state of preservation (degree of plant overgrowth etc.) can reveal the size of dead-ice blocks and the timing of their melting, whereas the location of these forms helps to estimate the rate of retreat of the Sucha Woda Glacier.
    Źródło:
    Przegląd Geologiczny; 2006, 54, 1; 73-75
    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 1-3 z 3

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