Palaeogeographical significance of the Eemian biogenic sediments at Bór site (Warta River valley, Central Poland)

Authors

  • Joanna Petera-Zganiacz Department of Geomorphology and Palaeogeography, University of Łódź
  • Ryszard K. Borówka Geology and Palaeogeography Unit, Faculty of Geosciences, Institute of Marine and Coastal Sciences, University of Szczecin, Mickiewicza 18, 70- 383 Szczecin, Poland,
  • Jacek Forysiak Department of Geomorphology and Palaeogeography, Institute of Earth Science, Faculty of Geographical Sciences, University of Łódź, ul. Narutowicza 88, 90-139 Łódź, Poland
  • Grażyna Miotk-Szpiganowicz Polish Geological Institute - NRI, Marine Geology Branch in Gdańsk-Oliwa, ul. Kościerska 5, 80-328 Gdańsk, Poland
  • Dominik Pawłowski Institute of Geology, Adam Mickiewicz University, ul. Maków Polnych 16, 61-606 Poznań, Poland

DOI:

https://doi.org/10.7306/gq.1122

Keywords:

gyttja, palynology, Cladocera, geochemistry, Warta River valley deposits

Abstract

An investigated area is located in the middle reach of the WartaRiver valley. During drillings in the Bór site organic deposits such as detritous calcareous gyttja and calcareous detritous gyttja has been documented in a depth between 14,9 and 16,6 m. The organic deposits are covered by mineral, mostly sandy deposits. The accumulation took place in the small lake formed as an abandoned channel. Palynological analysis led to conclusion that biogenic accumulation began at the end of Wartanian and took place at least to the Eemian Interglacial optimum. Results of palynological, Cladocera and geochemical analysis inform about water level changes and increasing of trophy status of the reservoir. Presence of Mesozoic substratum very close to the palaeolake bottom influenced significantly chemical features of the organic deposits. As Eemian organic deposits are uncommon in the Warta River valley, the Bór site seems important for palaeogeographical reconstructions of the Warta River valley during Eemian Interglacial.           

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Published

2013-10-23

Issue

Vol. 57 No. 4 (2013)

Section

Articles

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