Late Saalian (Wartanian) glacial palaeogeography and formation of end moraines at the northern slope of Silesian Rampart, Southwestern Poland

Krzyszkowski, D.; Łabno, A.

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Tytuł artykułu

Late Saalian (Wartanian) glacial palaeogeography and formation of end moraines at the northern slope of Silesian Rampart, Southwestern Poland

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Krzyszkowski D. , Łabno A.

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Warianty tytułu

Paleogeografia zlodowacenia Warty i powstanie moren czołowych na północnych stokach wału śląskiego, południowo-zachodnia Polska

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Abstrakty

There is evidence, hitherto often denied, for the ice marginal features, including the end moraine hills along the Silesian Rampart, SW Poland. These end moraines are attributed to the regional advance of the Wartanian ice sheet into its maximum position, which is also marked by subglacial till bed. The end moraine hills are located on the northern slopes of the Silesian Rampart and they are very rare, partly due to subsequent erosion, but mainly due to conditions not favourable for a remarkable proglacial accumulation. The Wartanian end moraines of southwestern Poland possess several features that suggest that they are end moraines with dominant waterlain, stratified sediments. They are interpreted as alluvial fans, where the ice margin is represented by a 'scarp'. They have semi-conical form, often plano-convex geometry and an average distal slope of 2-25°. These fans are equivalent to sheetflow-dominated or 'humid' alluvial fans in non-glacial environments. Sedimentary sequences of the end moraines consist mainly of coarse-grained material, with boulders up to 1.8 m in diameter, with typical sediments of 'proximal fan' with a highly pulsatory water discharge. The formation of the end moraine followed the formation of a proglacial lake and strong erosion after its drainage. The end moraine was formed during oscillation of the ice margin that resulted in local glaciotectonic deformation of the end moraine fan sediments (push) and a set of parallel hills, with successive younger alluvial fans (retreat).

Słowa kluczowe

proglacial environment end moraines ice-marginal sediments and processes landscape evolution late Saalian SW Poland

Wydawca

Polskie Towarzystwo Geologiczne

Czasopismo

Annales Societatis Geologorum Poloniae

Rocznik

2002

Tom

Vol. 72, No 1

Strony

67--87

Opis fizyczny

Bibliogr. 56 poz., rys., wykr.

Twórcy

autor

Krzyszkowski D.

P.O. Box 202, 53-350 Wrocław, Poland

autor

Łabno A.

Geological Enterprise “Proxima” S.A., Wierzbowa 7, PL.-50-056 Wroclaw, Poland

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