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Wyszukujesz frazę "sandur" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Variability of textural characteristics of sandur deposits of Flaajókull and Falljókull (SE Iceland)
    Autorzy:
    Angiel, Piotr
    Mikulska, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/2032503.pdf
    Data publikacji:
    2006-06-01
    Wydawca:
    Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
    Tematy:
    sandur
    coarse clastic sediments
    grain size parameters
    Iceland
    Opis:
    Studies conducted on the sandurs of Flaajókull and Falljókull aimed at the reconstruction of the dynamics of braided rivers based on the grain size parameters of deposits. The goal of the project was to estimate the degree of deposit transformation and of changes of grain size characteristics as related to the length of transport in contemporary sandur rivers.
    Źródło:
    Miscellanea Geographica. Regional Studies on Development; 2006, 12; 111-117
    0867-6046
    2084-6118
    Pojawia się w:
    Miscellanea Geographica. Regional Studies on Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geomorphology, sedimentology and origin of the glacigenic Złota Góra hills near Konin (Central Poland)
    Autorzy:
    Widera, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059142.pdf
    Data publikacji:
    2011
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Central Poland
    sandur
    end moraine
    interlobate landform
    Opis:
    The Złota Góra hills (Central Poland) have been variously interpreted as a kame, a sandur and as different types of moraine. Due to their morphology and internal structure, the Złota Góra hills differ, however, from typical depositional glacigenic landforms in the European lowlands. Morphologically, the Złota Góra hills consist of numerous asymmetrical and oval hills of various sizes. The deposits show a wide variety of lithofacies, which are diagnostic for debris flows, hyperconcentrated flows, sheetfloods, braided rivers, deltas and ephemeral lakes. The combination of such deposits is characteristic of an environmental setting including both an end moraine fan (debris flows, hyperconcentrated flows, sheetfloods and ephemeral lake deposits) and a sandur (braided river, sheetfloods, and delta or ephemeral lake deposits). Therefore, these hills must be interpreted as representing an end moraine/sandur massif. The hills were probably formed subaerially by meltwater in an interlobate area of the retreating Scandinavian ice sheet.
    Źródło:
    Geological Quarterly; 2011, 55, 3; 253-268
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Factors controlling sedimentation in the Toruń-Eberswalde ice-marginal valley during the Pomeranian phase of the Weichselian glaciation: an overview
    Autorzy:
    Pisarska-Jamroży, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/94659.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    sedimentology
    depositional mechanisms
    palaeohydraulics
    heavy minerals
    sandur
    Pleistocene
    Polska
    sedymentologia
    mechanizmy depozycyjne
    paleohydraulika
    minerały ciężkie
    sandr
    plejstocen
    Polska
    Opis:
    During the Pleistocene the Scandinavian ice sheet drained huge quantities of sediment-laden meltwaters. These meltwaters supplied ice-marginal valleys that formed parallel to the front of the ice sheet. Not without significance was the supply of ice-marginal valleys from extraglacial rivers in the south. Moreover, periglacial conditions during and after sedimentation in ice-marginal valleys, the morphology of valley bedrocks, and erosion of older sediments played important roles in the depositional scenarios, and in the mineralogical composition of the sediments. The mechanisms that controlled the supply and deposition in ice-marginal valleys were analysed on the basis of a Pleistocene ice-marginal valley that was supplied by northern and southern source areas in the immediate vicinity. Investigations were conducted in one of the largest ice-marginal valleys of the Polish-German lowlands, i.e., the Toruń-Eberswalde ice-marginal valley, in sandurs (Drawa and Gwda) supplied sediments and waters from the north into this valley, and on extraglacial river terraces (pre-Noteć and pre-Warta rivers), formed simultaneously with the sandurs and ice-marginal valley (Pomeranian phase of Weichselian glaciation) supplied sediments and waters from the south into this valley. A much debated question is how similar, or different, depositional processes and sediments were that contributed to the formation of the Toruń-Eberswalde ice-marginal valley, and whether or not it is possible to differentiate mostly rapidly aggraded sandur sediments from ice-marginal valley sediments. Another question addresses the contribution of extraglacial feeding of the Toruń-Eberswalde ice-marginal valley. These matters were addressed by a wide range of analyses: sediment texture and structure, architectural elements of sediments, frequency of sedimentary successions, heavy-mineral analysis (both transparent and opaque heavy minerals), analysis of rounding and frosting of quartz grains, and palaeohydrological calculations. Additionally, a statistical analysis was used. The specific depositional conditions of distribution of sediments in ice-marginal valley allow to distinguish new environment of ice-marginal valley braided river. The spectrum of depositional conditions in the Toruń-Eberswalde ice-marginal valley and their specific palaeohydraulic parameters allow to distinguish three coexisting zones in the ice-marginal valley braided-river system: (1) deep gravel-bed braided channel zone with extensive scours, (2) deep sand-bed braided channel zone with transverse bars, and (3) marginal sand-bed and gravel-bed braided channel zone with diamicton and breccia deposition, which were characterised in detail. Some of the results have been published previously, which is why they are discussed in the present paper within the context of new data.
    Źródło:
    Geologos; 2015, 21, 1; 1-29
    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
      Wyświetlanie 1-4 z 4

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