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Nowe spojrzenie na dynamikę lądolodu warty w strefie marginalnej na międzyrzeczu Krzny i Bugu

100%
Godlewska A.
Acta Geographica Lodziensia
|
2015
|
vol. 103
45-56
PL
Artykuł prezentuje najnowsze wyniki badań prowadzonych nad genezą rzeźby glacjalnej i dynamiką strefy marginalnej lądolodu warty w słabo dotychczas rozpoznanym obszarze międzyrzecza Krzny i Bugu we wschodniej Polsce. Zaprezentowany model odbiega znacząco od dotychczasowych poglądów, przyjmujących stan równowagi dynamicznej na linii maksymalnego zasięgu, a następnie recesję arealną. W świetle szczegółowych badań osadów glacigenicznych z wykorzystaniem analizy litofacjalnej, lądolód warty charakteryzował się zróżnicowaną dynamiką lobów lodowcowych, tak w fazie transgresji, jak i recesji. Jak wskazuje porównanie z najnowszymi wynikami badań między Piotrkowem Trybunalskim, Radomskiem a Przedborzem, pogląd o istnieniu lokalnych lobów w strefie marginalnej lądolodu warty i ich zróżnicowanej (silnie uwarunkowanej morfologią i litologią podłoża prewarciańskiego) dynamice jest aktualny również w środkowej Polsce.
EN
The paper presents the latest results of research on genesis of glacial relief and dynamics of the younger Saalian ice sheet in the marginal zone in poorly recognized area of the interfluve of the Krzna and Bug rivers in eastern Poland. The presented model is significantly different from those interpretations of the relief genesis in this area, presenting ice-margin stabilization stage and then areal recession. In the light of detailed morphological, geological and structural research, the younger Saalian ice sheet was characterized by differentiated dynamics of ice lobes, both during transgression and recession. A comparison with the latest results of research on area between Piotrków Trybunalski, Radomsko and Przedbórz, the notion on presence of regional lobes in the marginal zone of the younger Saalian ice sheet and their differentiated (conditioned by morphology and lithology of pre-Saalian substrate) dynamics is also actual in central Poland.
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Rola procesów glacjalnych w kształtowaniu rzeźby południowego obrzeżenia Kotliny Kolskiej

70%
Rdzany Z., Szmidt A., Tarnawska K.
Biuletyn Uniejowski
|
2013
|
vol. 2
5-22
EN
The article analyses the southern part of the expansion of the Bzura-Ner Spillway (Bzura-Ner Pradolina), called the Koło Basin as well as neighbouring areas of the Łask Upland Plain and the Turek Upland Plain. The purpose of the study was to present the role of Pleistocene glaciations, especially the Warta Glaciation and, in particular, their role in the evolution of land relief in this area. It was noted that morphological activity of continental glaciers depended on morphology, lithology and dynamics of the bedrock. Special attention was paid to effects characteristic of the transgression and disappearance of the Warta ice sheet. A survey of geological and geomorphological literature, analyses of archival data, mainly the accounts of geological drillings as well as results of geomorphological and palaeogeomorphological research constitute the basis for the presented data and views. It was found that successive continental glaciers had reduced height differences of the Pleistocene bedrock without obliterating the main forms in the area. Despite the genetic diversity of forms, postglacial forms and sediments – which emerged during the glaciation of the Warta (the last glaciation in this area) – play a predominant part in the described area. The features of glacial tills and fluvioglacial and limnoglacial sediments which form Wartian mounds, hills, and ridges prove that at the end of the Warta glaciation, during deglaciation (in the Bzura sub-phase), the dynamics of glacial processes was intensified. Accumulation of ice in the lower part of the current Koło Basin was conducive to increased dynamics of the ice lobe through oscillations and, possibly, through glacial surges. However, activity of the ice sheet edge has been blurred as a result of areal deglaciation, which is documented by numerous kames – the most widespread convex glacial forms in the area.
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