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    Wyświetlanie 1-4 z 4
    Tytuł:
    The first record of red till lithotype in western Poland and its implication for glacial stratigraphy and palaeogeography
    Autorzy:
    Krzyszkowski, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/191966.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    till petrography
    red till lithotype
    Elsterian
    Western Poland
    Opis:
    The first site in western Poland with a red till lithotype has been discovered in the Trzebnica Hills, southwestern Poland. This is a clay-rich, red till with dominant East-Baltic material (East-Baltic lithotypes). The red till forms the uppermost part of the Borowiec Till, a till from the Sanian 2 (Elsterian) Glaciation. Moreover, some Borowiec tills in the Barycz River valley (north) and the Prosna River valley (east) contain in their uppermost parts a dolomite-rich horizon, which, although only greyish-brown, also represents the East-Baltic till lithotypes. The late Elsterian ice sheet in Poland was developed as several ice-lobes with different ice dynamics. The lobes from western Poland advanced to their maximum extent earlier than the eastern lobes. In the latest phase of the glaciation, the western lobes retreated, while the eastern ones advanced from NE to SW. Their presence is proved by deposition of the Borowiec Till and East-Baltic till lithotypes.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2010, 80, No 1; 53-67
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elsterian ice sheet dynamics in a topographically varied area (southern part of the Racibórz–Oświęcim Basin and its vicinity, southern Poland)
    Autorzy:
    Salamon, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060370.pdf
    Data publikacji:
    2017
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    ice sheet dynamic
    fore-mountain area
    subglacial till
    Elsterian Glaciation
    Ostrava Basin
    Opis:
    During the Elsterian Glaciation, the Scandinavian Ice Sheet, before reaching its maximum extent, advanced over the mountainous foreland of Southern Poland, which was characterized by a substrate of increasingly varied relief. One such area was the hilly Rybnik Plateau of the southern part of the Racibórz–Oświęcim Basin, located directly north of the Ostrava Basin and Moravian Gate, where the ice sheet advanced far south and formed a large lobe. In this study, till from the Łaziska site, located in southern part of the Rybnik Plateau, was analysed and interpreted. The till was deposited at the top of an W–E oriented ridge composed of Neogene clays. The study indicates that a high basal water pressure occurred at the base of the ice sheet, favouring a basal mechanism of ice sheet movement. Till fabric and kinematic structures indicate that ice flowed easily from the west over the ridge, parallel to its axis. Reconstructed patterns of ice flow direction reflect an ice sheet that was characterized by a strong spatially varied dynamics. The Odra Valley was the main corridor of fast flowing ice to the Ostrava Basin, from where ice was distributed radially in different directions. The second corridor of actively flowing ice was probably located in the Ruda palaeovalley to the north of the Rybnik Plateau. In the central part of the Rybnik Plateau, ice flow was restricted. This less dynamic ice sheet behaviour resulted mostly from the much higher location of the area. This study indicates that the large morphological and lithological variations of the ice sheet substrate induced varied frictional resistance, producing a spatially varied stress field within the ice sheet. This generated active zones of streaming ice adjacent to more passive zones. Potential switching between neighbouring active zones transporting ice towards the ice sheet margin is postulated.
    Źródło:
    Geological Quarterly; 2017, 61, 2; 465--479
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Revised stratigraphy and palaeogeography of the Rostan Hills in northwestern Ukraine
    Autorzy:
    Rychel, Joanna
    Orłowska, Anna
    Zbucki, Łukasz
    Nowacki, Łukasz
    Zalesskij, Ivan
    Powiązania:
    https://bibliotekanauki.pl/articles/2025050.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ice-sheet dynamics
    petrographic analysis
    lithofacies analysis
    Elsterian ice sheet
    MIS 12
    NW Ukraine
    Opis:
    This paper presents a new approach to stratigraphy and palaeogeography of NW Ukraine. So far, the glacial landforms near the Rostan area have been interpreted as end moraines derived from the Saalian ice-sheet. Sedimentological and petrographic analyses conducted at the Rostan site shed new light on the dynamics and age of the ice-sheet that formed the examined glaciogenic forms. Sedimentological analysis of glacial deposits documented the sedimentary environment of a glaciofluvial fan deposited by the ice-sheet front characterised by varying dynamics, i.e. advancing, stationary and retreating. Petrographic analysis proved an older age of deposits, i.e. Elsterian, and not Saalian as interpreted so far. These results shed new light on palaeogeography and stratigraphy of this area. The occurrence of the Elsterian deposits on the surface gives evidence of the absence of younger – Saalian – glaciation in this area, which relates to the recently announced new approaches to palaeogeography and stratigraphy of neighbouring areas in eastern Poland.
    Źródło:
    Studia Quaternaria; 2021, 38, 1; 33-41
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lithology of glacial sediments of Sanian-2 (Elsterian-2) stage at Tenczynek Basin, Kraków region, Southern Poland
    Litologia osadów glacjalnych z piętra Sanu-2 w Kotlinie Tenczynka na zachód od Krakowa
    Autorzy:
    Rutkowski, Jacek
    Zuchiewicz, Witold
    Bluszcz, Andrzej
    Helios-Rybicka, Edeltrauda
    Powiązania:
    https://bibliotekanauki.pl/articles/27311296.pdf
    Data publikacji:
    1998
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    lithology
    petrography
    Sanian-2 glacial stage
    Elsterian-2 glacial stage
    Quaternary
    Tenczynek Basin
    southern Poland
    Opis:
    The paper deals with the lithology of Quaternary sediments that fill the Tenczynek Basin, Kraków Upland. The basin was eroded within Carboniferous strata before or during the Elsterian. The basin fill can be subdivided into three complexes, the middle one of which records a nearly complete glacial cycle, represented by glacier advance and standstill during the Elsterian-2 (Sanian-2) glacial stage. Sediments of the lower complex were deposited before or during that stage. Following this deposition, a terminoglacial lake was formed and became gradually filled with glaciolacustrine clays and silts that bear a few intercalations of diamictons, some of them shed by slumps. These sediments compose the middle, strongly disturbed complex which, in turn, is unconformably overlain by periglacial sands of the upper complex, deposited during a time-span comprised between the Sanian and Weichselian. The petrographic composition of gravels and cobbles, determined for a wide spectrum of grain-size classes, is highly variable due to differentiated exaration and the changeable supply of extraglacial material.
    Artykuł omawia litologię osadów czwartorzędowych wypełniających Kotlinę Tenczynka na zachód od Krakowa. Kotlina została wyerodowana w skałach karbonu przed lub w trakcie zlodowacenia Sanu-2. Piaski i żwiry dolnego kompleksu osadowego powstały przed zlodowaceniem i w wyniku zatamowania odpływu przez lądolód. Następnie doszło do utworzenia jeziora terminoglacjalnego i sedymentacji osadów glacilimnicznych, z wkładkami diamiktytów o bardzo zmiennym uziarnieniu. Osady te, budujące kompleks środkowy, są silnie zaburzone i przykryte niezgodnie przez peryglacjalne piaski pokrywowe kompleksu górnego, osadzone po zlodowaceniu Sanu. Skład petrograficzny żwirów i głazików w osadach glacjalnych, analizowany dla różnych przedziałów frakcyjnych, jest bardzo zmienny z uwagi na zróżnicowanie lokalnej egzaracji i zmiany w dostawie materiału ekstraglacjalnego.
    Źródło:
    Annales Societatis Geologorum Poloniae; 1998, 68, 4; 247--265
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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