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    Wyświetlanie 1-4 z 4
    Tytuł:
    Multi-method geophysical mapping of ground properties and periglacial geomorphology in Hans Glacier forefield, SW Spitsbergen
    Autorzy:
    Marciniak, Artur
    Osuch, Marzena
    Wawrzyniak, Tomasz
    Owoc, Bartosz
    Dobiński, Wojciech
    Glazer, Michał
    Majdański, Mariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/16538466.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    Arctic
    Svalbard
    geophysical imaging
    periglacial environment
    glacial landforms
    Opis:
    This article presents the results of a geophysical survey from which detailed images of glacial and periglacial landforms and subsurface structures were obtained. Sediments and landforms on newly deglaciated terrain can be used to reconstruct the extent and character of glaciers in the past and add to the understanding of their response to climate and environmental changes. To derive spatial information from complex geomorphological terrain, joint interpretation of three non-intrusive geophysical methods were applied: Electrical Resistivity Tomography (ERT), Ground Penetrating Radar (GPR), and time-lapse Seismic Tomography. These were used to identify subsurface structures in the forefield of the retreating Hans Glacier in SW Spitsbergen, Svalbard. Three main zones were distinguished and described: outwash plain, terminal moraine from the last glacial maximum, and glacial forefield proximal to the glacier front. Geophysical profiles across these zones reveal information on glacio-fluvial sediment thickness and structure, ice thickness and structure, and bedrock topography. The freezing-thawing effect of the active layer has a strong and deep impact, as demonstrated by variations in P-wave velocity in the obtained outcomes. The results are discussed in the context of the current climate in Svalbard. This study provides a snapshot of ground parameters and the current state of the subsurface in southern Spitsbergen. The boundary between sediment-bedrock layers was estimated to be from 5 to 20 m in depth. It is the first such extensive description of periglacial structures in the forefield of the Hans Glacier, utilising the longest ERT profile (1500 m) in Svalbard together with deep GPR and precise seismic tomography.
    Źródło:
    Polish Polar Research; 2022, 43, 2; 101-123
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unikalne stanowisko szczątków mamuta na Dolnym Śląsku
    Unique site of the mammoth remains in the Lower Silesia
    Autorzy:
    Wiśniewski, A.
    Wojtal, P.
    Krzemińska, A.
    Zych, J.
    Przybylski, B.
    Badura, J.
    Ciszek, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074685.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    mamut
    vistulian
    środowisko peryglacjalne
    Dolny Śląsk
    mammoth
    Weichselian glaciation
    periglacial environment
    Lower Silesia
    Opis:
    Aunique set of mammoth bones and tusk was found in active gravel pit in vicinities of Zastruże near Żarów, Lower Silesia. The use of archaeological methods made it possible to uncover 17 bones belonging to a single individual (Mammuthus primigenius). This is the first record of so complete set of mammoth bones in the Lower Silesian region. Mammoth remains were found to be accompanied by some bones of a horse and a flint artifact. The mammoth bones were dated radiocarbon method at 23 790 š 160 years, that is at the beginning of the last Pleniglacial of the Weichselian Glaciation. The mammoth remains were embedded in slope sediments of a small valley so they did not occurin anatomical order.
    Źródło:
    Przegląd Geologiczny; 2009, 57, 3; 234-242
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Depositional conditions on an alluvial fan at the turn of the Weichselian to the Holocene – a case study in the Żmigród Basin, southwest Poland
    Autorzy:
    Zieliński, P.
    Sokołowski, R. J.
    Fedorowicz, S.
    Woronko, B.
    Hołub, B.
    Jankowski, M.
    Kuc, M.
    Tracz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/94513.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    climate change
    periglacial environment
    fluvial processes
    aeolian processes
    luminescence dating
    zmiana klimatu
    środowisko peryglacjalne
    procesy fluwialne
    procesy eoliczne
    datowanie luminescencyjne
    Opis:
    Presented are the results of research into the fluvio-aeolian sedimentary succession at the site of Postolin in the Żmigród Basin, southwest Poland. Based on lithofacies analysis, textural analysis, Thermoluminescence and Infrared-Optical Stimulated Luminescence dating and GIS analysis, three lithofacies units were recognised and their stratigraphic succession identified: 1) the lower unit was deposited during the Pleni-Weichselian within a sand-bed braided river functioning under permafrost conditions within the central part of the alluvial fan; 2) the middle unit is the result of aeolian deposition and fluvial redeposition on the surface of the fan during long-term permafrost and progressive decrease of humidity of the climate at the turn of the Pleni to the Late Weichselian; 3) the upper unit accumulated following the development of longitudinal dunes at the turn of the Late Weichselian to the Holocene; the development of dunes was interrupted twice by the form being stabilised by vegetation and soil development.
    Źródło:
    Geologos; 2016, 22, 2; 105-120
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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