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Wyszukujesz frazę "glaciolacustrine deposits" wg kryterium: Temat

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    Wyświetlanie 1-3 z 3
    Tytuł:
    Development and infill of Vistulian glacial Lake Gniew (N Poland) : a sedimentological analysis
    Autorzy:
    Błaszkiewicz, M.
    Gruszka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059705.pdf
    Data publikacji:
    2005
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Vistulian
    glacial lake
    sedimentology
    glaciolacustrine deposits
    massive clay
    jökulhlaup
    Opis:
    A substantial glaciolacustrine unit in northern Poland, between the valleys of the Vistula and Wierzyca rivers, was deposited in glacial Lake Gniew during the climatic amelioration of the Late Vistulian. It covers an area of 35 km2 and has an average thickness of 7m, but locally reaches over 20 m. Four sedimentary facies are distinguished. The silty/clayey rhythmites of facies A are interpreted as varves from the central lake bottom. They represent the initial stage of lake development. Facies B is formed by a single sand layer that is interpreted as a turbidite originating during lake shallowing due to self-drainage. Facies C consists of massive clay with dropstones and dump structures. Two hypothesis regarding its genesis are put forward: the first assumes sedimentation in a shallow basin with a high input of homogenous fine-grained suspended sediment, whereas the second explains the facies as a result of amuddy jökulhlaup, pouring into Lake Gniew and being sourced from another glacial lake; further research is required to interpret this facies reliably. Facies D consists of thick silty/clayey rhythmites that are interpreted as prodeltaic deposits.
    Źródło:
    Geological Quarterly; 2005, 49, 4; 449--462
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The evolution of a Weichselian proglacial lake in NW Poland as revealed by static penetration tests
    Autorzy:
    Wierzbicki, Jędrzej
    Paluszkiewicz, Renata
    Paluszkiewicz, Ryszard
    Powiązania:
    https://bibliotekanauki.pl/articles/94539.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    glaciolacustrine deposits
    varves
    overconsolidation
    CPTU method
    Pomeranian Lakeland
    Polska
    osad glacjalny
    prekonsolidacja
    Pojezierze Pomorskie
    Polska
    Opis:
    The lithology, structure and geophysical characteristics of the glaciolacustrine clays deposited in the Wierzchowo proglacial lake were determined using static penetration tests (CPTU) in combination with standard lithological measurements. The deposits are divided into four lithological units (R1 to R4) on the basis of overconsolidation. Units R3 and R4 are separated by mass-flow deposits. The depositional conditions history of the lake result represent four phases: (1) an initial (low-energy) phase with the deposition of the rhythmically laminated sediments of units R1 and R2, which are divided by an erosional interval; (2) a phase of non-deposition with some desiccation structures and extended consolidation of sediments; (3) the main phase characterised by deposition of the rhythmically laminated sediments of unit R3; and finally, (4) the youngest phase, which represents alternations of deposition and erosion. The results show that sedimentation in the Wierzchowo proglacial lake was less continuous, and that the depositional processes were more complex than in the neighboring Złocieniec glacial lake.
    Źródło:
    Geologos; 2011, 17, 2; 111-119
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    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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