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    Wyświetlanie 1-7 z 7
    Tytuł:
    Kame or moraine? A sedimentological study of a glaciomarginal landform at Niedźwiedziny (Great Polish Lowland)
    Autorzy:
    Ewert-Krzemieniewska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/94579.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    sedimentology
    glaciomarginal zone
    kame
    Weichselian
    Middle Poland
    sedymentologia
    strefa glacimarginalna
    kem
    Środkowa Polska
    Opis:
    A sedimentary succession in a gravel pit at Niedźwiedziny was investigated in order to determine its origin: kame or moraine. The gravel pit is located in an isolated hill of approx. 600 m long and 250–400 m wide. The succession is built of glaciofluvial deposits: a sandy/gravelly unit in the lower and middle parts, overlain by diamicton. Five lithofacies have been distinguished, which represent two facies associations: (1) a fluvial association evolving from a high-energy to a transitional to a shallow braided river on an alluvial fan, and (2) an association of cohesive deposits representing a glacigenic mass flow. The interpretation is based mainly on palaeocurrent data and differs from conclusions by earlier investigators. The ice-marginal zone is characterised by a large variety of glaciomarginal forms. Their sedimentology, morphology and palaeogeography are determined by successive phases of deglaciation. The results of the present study show that the character of the deglaciation in the study area changed with time from frontal to areal deglaciation.
    Źródło:
    Geologos; 2014, 20, 3; 167-181
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sedimentary record of a Pleistocene ice-sheet interlobate zone (NE Poland)
    Autorzy:
    Gruszka, Beata
    Morawski, Wojciech
    Zieliński, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/94281.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    interlobate sedimentation
    outwash deposits
    esker
    Weichselian
    NE Poland
    sedymentacja
    osady sandrowe
    oz
    Polska Północna
    Opis:
    Well developed NE-SW trending corridors of outwash in NE Poland are associated with a series of lakes with a similar direction of elongation. The glaciofluvial corridor under study consists of parallel ridges with associated channels and kames. The deposits are flanked by till and hummocky terrain. The gravel ridges are composed of sand and gravel deposits that are cross-stratified, massive or graded, and that contain cut-and-fill structures and large intra-clasts of sand and gravel. Locally the deposits show normal faults. The succession of one of the ridges is interpreted to reflect the infilling of a braided channel in a crevasse. Sedimentation took place in some phases when the ice-sheet regime changed from active to stagnant. Sandy-gravel ridges occur within this complex perpendicular to the Weichselian icesheet margin. The corridor is interpreted as an interlobate area in the zone between the Warmia and Mazury ice lobes. The braided-channel deposits are not comparable to typical Polish sandurs. The lithofacies characteristics show higher energy conditions, and the channels are deeper than those typical of Pleistocene lowland sandurs. The sand and gravel ridges are interpreted as interlobate eskers.
    Źródło:
    Geologos; 2012, 18, 2; 65-81
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    O możliwościach rekonstrukcji paleotemperatur vistulianu na podstawie kopalnych zespołów ptaków
    Reconstruction of Vistulian palaeotemperatures on the basis of fossil bird assemblages
    Autorzy:
    Lorenc, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/94241.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    vistulian
    paleotemperatura
    osady jaskiniowe
    szczątki kostne ptaków
    Vistulian
    Weichselian
    palaeotemperature
    cave sediments
    bird bone remains
    Opis:
    Pochodzące z vistulianu szczątki ptaków znane są w Polsce niemal wyłącznie z osadów jaskiń i schronisk skalnych, w sumie z 18 stanowisk. Relatywnie liczne są wyłącznie szczątki pochodzące ze środkowego i późnego vistulianu. W artykule podsumowano zamieszczone w literaturze dane dotyczące występowania i zróżnicowania gatunkowego kości ptaków w vistuliańskich osadach powyższych 18 stanowisk. Zespoły ptaków z vistuliańskich osadów poszczególnych jaskiń i schronisk skalnych stanowiły często podstawę rekonstrukcji paleośrodowiska, rzadziej paleoklimatu. W artykule podsumowano średnie temperatury lipca, które na podstawie tych zespołów oszacowano do tej pory dla niektórych faz klimatycznych vistulianu. Większość temperatur określono używając metody obliczania wskaźników termicznych, według Demarcq & Mourer-Chauvire (1976) i przeliczania wartości tych wskaźników na °C, według Lorenca (2007). Metody te zostały ogólnie scharakteryzowane. Prezentowane temperatury odnoszą się do następujących faz klimatycznych vistulianu: późny vistulian (bölling, starszy dryas, alleröd, młodszy dryas), późny plenivistulian, środkowy plenivistulian (denekamp, hengelo), wczesny plenivistulian (schalkholz) i wczesny vistulian (odderade). Wskazano mocne i słabe strony rekonstrukcji paleotemperatur na podstawie powyższych zespołów ptaków.
    Vistulian bird-bone remains are known in Poland almost exclusively from sediments of 18 caves and rockshelters in the Kraków-Częstochowa Upland, the Podhale Depression and the Holy Cross Mountains. Only remains from the Middle and Late Vistulian are relatively abundant. The present contribution summarizes literature data on the occurrence and species diversity of bird-bone remains from the 18 sites mentioned above. The bird-bone assemblages from the caves and rock-shelters were often used to reconstruct the then palaeoenvironment, more rarely the palaeoclimate. Analysis of the bird-bone assemblages indicates average July temperatures for some Vistulian intervals, viz. the Late Vistulian (Bölling, Older Dryas, Alleröd, Younger Dryas), Late Plenivistulian, Middle Plenivistulian (Denekamp, Hengelo), Early Plenivistulian (Schalkholz) and Early Vistulian (Odderade). Most of the temperatures were assessed through thermal indices (Demarcq & Mourer-Chauvire 1976), but they were estimated by Lorenc’s (2007) method as well. Both methods are explained in the present contribution. In addition, the advantages and disadvantages of palaeotemperature reconstruction on the basis of bird-bone assemblages are specified.
    Źródło:
    Geologos; 2008, 14, 1; 91-106
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Palynology of Late Pleistocene varved clays from ice-dammed lakes at Lębork and Złocieniec (north-western Poland) - preliminary results
    Autorzy:
    Gedl, Przemysław
    Powiązania:
    https://bibliotekanauki.pl/articles/94298.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    palynology
    varved clays
    palaeoenvironment
    Weichselian
    Pleistocene
    NW Poland
    analiza pyłkowa
    iły warwowe
    paleośrodowisko
    plejstocen
    Polska północna
    Opis:
    Samples collected from Late Pleistocene varved clays of the Vistulian (Weichselian) glaciation exposed at Lębork and Złocieniec (Gardno and Pomeranian phases, respectively) yielded palynological contents that are related to the different lithologies composing the varves. The dark-coloured clay units contain very small amounts of palynological material. The lighter-coloured, much thicker coarser units yielded large amounts of organic particles consisting of predominantly palynodebris of terrestrial plants, sporomorphs and aquatic palynomorphs. The latter include fresh-water and marine phytoplankton. All particles were presumably washed out from the pre-Quaternary basement or from erratic material. This is indicated by the dinoflagellate-cyst assemblages, which represent Cretaceous and Palaeogene taxa. The large amounts of organic particles in the light-coloured layers indicate high-energy meltwaters streams, which washed them out, transported them and deposited them in ice-dammed lakes. The barren layers and those with lower amounts of organic particles were deposited during calm, presumably winter, periods, when the energy of the meltwater streams was much lower.
    Źródło:
    Geologos; 2011, 17, 1; 49-59
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reconstruction of sediment provenance and transport processes from the surface textures of quartz grains from Late Pleistocene sandurs and an ice-marginal valley in NW Poland
    Autorzy:
    Woronko, B.
    Pisarska-Jamroży, M.
    van Loon, A. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/94315.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    quartz grain micromorphology
    ice-marginal valley
    sandur
    Weichselian glaciation
    Polska
    mikromorfologia ziaren kwarcu
    pradolina
    zlodowacenie północnopolskie
    Polska
    Opis:
    During the Pomeranian phase of the Weichselian glaciation (~17–16 ka), the Toruń-Eberswalde ice-marginal valley (NW Poland and easternmost Germany) drained water from the Pomeranian ice sheet, while intensive aeolian processes took place across Europe in the foreland of the Scandinavian ice sheet (‘European Sand Belt’). The micromorphology of the quartz grains in the Toruń-Eberswalde ice-marginal valley shows no traces of these aeolian processes, or only vague signs of aeolian abrasion. This is unique among the aeolian sediments in other Pleistocene ice-marginal valleys in this part of Europe. The study of the surfaces of the quartz grains shows that the supply of grains by streams from the south was minimal, which must be ascribed to the climate deterioration during the Last Glacial Maximum, which resulted in a decrease of the discharge of these extraglacial rivers to the ice-marginal valley.
    Źródło:
    Geologos; 2015, 21, 2; 105-115
    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:
    Heavy minerals as a tool to reconstruct river activity during the Weichselian glaciation (Toruń Basin, Poland)
    Autorzy:
    Weckwerth, Piotr
    Chabowski, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/94678.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    heavy minerals
    ice-marginal valley
    river-discharge regime
    channel-pattern transformation
    Toruń Basin
    Weichselian
    ciężkie minerały
    pradolina
    dorzecze Torunia
    zlodowacenie północnopolskie
    Opis:
    The heavy-mineral composition of the Weichselian fluvial successions deposited by an ephemeral meandering river and by a sand-bed braided river in the Toruń Basin (central Poland) was analysed. On the basis of a lithofacies analysis, in combination with the composition of the heavy-mineral assemblages, the fluvial processes and river-channel morphology were reconstructed. This allows determining the provenance of the fluvial deposits and the rivers’ discharge regimes. A model is proposed which can explain the changes in the amount of individual minerals in the fluvial sediments of different ages under the conditions of the oscillating Scandinavian ice sheet. The model assumes that, during the ice-sheet advances, the proglacial streams supplied large amounts of heavy minerals that were less resistant to mechanical abrasion. During the main phase of the ice-sheet retreat, the distance between the ice sheet and the Toruń Basin increased, and the amount of non-resistant minerals diminished as a result of sediment reworking in proglacial rivers. Due to the unique location of the Toruń Basin at the front of the Scandinavian ice sheet during the Weichselian glaciation, the heavy-mineral assemblages in the fluvial deposits form a valuable tool for the recognition of the ice-sheet extent.
    Źródło:
    Geologos; 2013, 19, No. 1-2; 25-46
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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