Evolution of Early Pleistocene fluvial systems in central Poland prior to the first ice sheet advance – a case study from the Bełchatów lignite mine

dc.contributor.authorGoździk, Jan
dc.contributor.authorZieliński, Tomasz
dc.date.accessioned2017-09-13T06:40:00Z
dc.date.available2017-09-13T06:40:00Z
dc.date.issued2017-08
dc.description.abstractDeposits formed between the Neogene/Pleistocene transition and into the Early Pleistocene have been studied, mainly on the basis of drillings and at rare, small outcrops in the lowland part of Polish territory. At the Bełchatów lignite mine (Kleszczów Graben, central Poland), one of the largest opencast pits in Europe, strata of this age have long been exposed in extensive outcrops. The present paper is based on our field studies and laboratory analyses, as well as on research data presented by other authors. For that reason, it can be seen as an overview of current knowledge of lowermost Pleistocene deposits at Bełchatów, where exploitation of the Quaternary overburden has just been completed. The results of cartographic work, sedimentological, mineralogical and palynological analyses as well as assessment of sand grain morphology have been considered. All of these studies have allowed the distinction of three Lower Pleistocene series, i.e., the Łękińsko, Faustynów and Krzaki series. These were laid down in fluvial environments between the end of the Pliocene up to the advance of the first Scandinavian ice sheet on central Poland. The following environmental features have been interpreted: phases of river incision and aggradation, changes of river channel patterns, source sediments for alluvia, rates of aeolian supply to rivers and roles of fluvial systems in morphological and geological development of the area. The two older series studied, i.e., Łękińsko and Faustynów, share common characteristics. They were formed by sinuous rivers in boreal forest and open forest environments. The Neogene substratum was the source of the alluvium. The younger series (Krzaki) formed mainly in a braided river setting, under conditions of progressive climatic cooling. Over time, a gradual increase of aeolian supply to the fluvial system can be noted; initially, silt and sand were laid down, followed by sand only during cold desert conditions. These fluvio-periglacial conditions are identified in the foreground of the advance of the oldest ice sheet into this part of central Poland. The series studied have been compared with other fluvial successions which accumulated in the Kleszczów Graben during subsequent glaciations so as to document general changes in fluvial systems as reactions to climatic evolution. Thus, a palaeoenvironmental scenario has emerged which could be considered to be characteristic of central Poland during the Early Pleistocene.pl_PL
dc.identifier.citationGeologos, 2017, 23, 2, pp. 89-107pl_PL
dc.identifier.isbn978-83-232187-4-6
dc.identifier.issn1426-8981
dc.identifier.urihttp://hdl.handle.net/10593/19279
dc.language.isoengpl_PL
dc.publisherInstytut Geologii UAMpl_PL
dc.rightsinfo:eu-repo/semantics/openAccesspl_PL
dc.subjectQuaternarypl_PL
dc.subjectpreglacialpl_PL
dc.subjectfluvial-aeolian interactionpl_PL
dc.subjectheavy mineralspl_PL
dc.subjectquartz grain morphologypl_PL
dc.subjectsedimentologypl_PL
dc.subjectpalaeoclimatepl_PL
dc.titleEvolution of Early Pleistocene fluvial systems in central Poland prior to the first ice sheet advance – a case study from the Bełchatów lignite minepl_PL
dc.typeArtykułpl_PL

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Uniwersytet im. Adama Mickiewicza w Poznaniu
Biblioteka Uniwersytetu im. Adama Mickiewicza w Poznaniu
Ministerstwo Nauki i Szkolnictwa Wyższego