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Ice-Sheet Dynamics of Warta Glaciation (Saale) in the Marginal Zone of Knyszewicze Area, Northeastern Poland

Rychel J., Woronko B., Karasiewicz M. T., Szymczuk P., Morawski M.

Studia Quaternaria

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2015

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Vol. 32, Nr 2

79--90

EN

The paper presents a research on a marginal zone near Knyszewicze in the southern part of Sokółka Hills (northeastern Poland). Terminal moraine hills are arranged amphitheatrically in a lobal pattern. Dynamics of the Knyszewicze frontal ice-sheet lobe during the Saale Glaciation and successive stages of the marginal zone near the village of Knyszewicze were reconstructed based on sedimentary and geomorphological analysis, using a digital elevation model and morpholineaments. Three main phases of the Knyszewicze glacial-lobe activity were identified including accumulation of glaciofluvial deposits, advances of the ice margin and ice-lobe retreat. Moraine hills developed at a stable ice-lobe terminus, initially as short end-moraine fans with the following sequence of lithofacies Gh=>SGh=>Sh or Gm=>Gh=>Sh. Such a sequence indicates cyclic sheet-floods. During a small but dynamic advance of the ice sheet terminus, these deposits were moved forward and monoclinally folded, then furrowed with sloping faults due to horizontal pressure. Typical thrust-block push moraines developed in this way. Ice sheet advance took place when permafrost was present in the substratum and very high water pressure occurred at glacial terminus. Inside a lobal configuration of moraines, there is a rich inventory of glacial forms with a classic terminal depression in the central part. Based on this landform pattern, their shape, rhythm and glaciotectonic disturbances, the land relief may be referred to as a hill-hole pair. The structure of Horczaki Knoll, deposited on the sub-Quaternary tectonic structure, significantly contributed to a development of this marginal zone.

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Recession and development of marginal zone of the Scott Glacier

Reder J., Zagórski P.

Landform Analysis

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2007

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Vol. 5

175--178

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Przydatność analizy litologicznej glin morenowych w badaniach geomorfologicznych stref marginalnych ostatniego zlodowacenia

Woźniak P. P.

Przegląd Geologiczny

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2004

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Vol. 52, nr 4

336-339

EN

Lithological analysis of glacial tills is a usefull tool for investigations of marginal zones of Pleistocene glaciations. Presented documentation was based on several examples taken from selected regions of Pomerania, Northern Poland. Simultaneously, regional variability of petrographical tills com po si tion was dem on strated. Some interpretational problems caused by tills weathering are discussed.

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Maksymalny zasięg lądolodu stadiału Warty w lobie Prosny

Haisig J., Wilanowski S.

Biuletyn Państwowego Instytutu Geologicznego

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1998

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nr 385

105-111

PL

Badania prowadzone w rejonie lobu Prosny wykazały dalszy ku południowi (miejscami do 10 km) zasięg strefy marginalnej maksymalnego zasięgu stadiału Warty, wyznaczony głównie na podstawie przebiegu wzgórz moren czołowych oraz występowania poziomu glin lodowcowych. Gliny lodowcowe występujące w lobie Prosny mają cechy litologiczne podobne do glin lodowcowych z tego samego wieku, obserwowanych w dorzeczu Widawki oraz na Wale Śląskim. Na północ od strefy maksymalnego zasięgu lądolodu stadiału Warty zaznaczają się dwie strefy moren recesyjnych.

EN

Current investigations have documented that the maximum extent of the Wartanian ice sheet in the Prosna lobe lies more southwards than hitherto assumed. It occurs in places about 10 km to the south, especially in the central part of the lobe. The ice sheet extent is usually marked by distinct end moraines, but in places only by the till. The Wartanian till in the region investigated has similar mineralogical and petrological features as Wartanian tills in surrounding regions. Northwards the maximum ice sheet extent, there are other end moraine hills, which represent recessional phases, as well as several kames and one esker. South of the terminal moraines, the ice marginal valleys filled with glaciofluvial sands occur extensively.