Asynchronous development of two Late Glacial lake basins near the Drwęca ice-marginal valley (N Poland)

Authors

  • Wojciech Gamrat Department of Geomorphology and Paleogeography of the Quaternary, Nicolaus Copernicus University
  • Mirosław Błaszkiewicz Department of Environmental Resources and Geohazard, Polish Academy of Science
  • Leon Andrzejewski Department of Geomorphology and Paleogeography of the Quaternary, Nicolaus Copernicus University
  • Iwona Krześlak Department of Geomorphology and Paleogeography of the Quaternary, Nicolaus Copernicus University

DOI:

https://doi.org/10.7306/gq.1348

Keywords:

Palaeolakes, buried dead-ice, Plenivistulian, Late Glacial, Holocene, northern Poland

Abstract

Lacustrine organic sediments were sampled at Gronowo (Chełmno Plateau) and Piotrkowo (Dobrzyń Plateau) located within a widespread system of subglacial channels separated by the large Drwęca ice-marginal valley. They have been examined for their pollen, plant macro-remains and geochemistry, as well as radiocarbon-dated. The analyses have allowed reconstructing the evolution of the area and presenting an asynchronous appearance of two lakes. Before lake sedimentation, glaciolimnic sediments from the end of Plenivistulian, at the site of Piotrkowo, was dated. Lacustrine sedimentation started during the AllerÝd at Gronowo, and during the Preboreal at Piotrkowo. The different age of the two lakes is ascribed mainly to differences in the Late Glacial drainage conditions which directly affected the melting away of dead-ice blocks buried in the channels.

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Published

2017-03-08

Issue

Vol. 61 No. 2 (2017)

Section

Articles

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