Diurnally and Seasonally Controlled Sedimentation on a Glaciolacustrine Foreset Slope: An Example from the Pleistocene of Eastern Poland

  1. Albina Colella2 and
  2. David B. Prior3
  1. K. Mastalerz

Published Online: 2 APR 2009

DOI: 10.1002/9781444303858.ch17

Coarse-Grained Deltas

Coarse-Grained Deltas

How to Cite

Mastalerz, K. (1990) Diurnally and Seasonally Controlled Sedimentation on a Glaciolacustrine Foreset Slope: An Example from the Pleistocene of Eastern Poland, in Coarse-Grained Deltas (eds A. Colella and D. B. Prior), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444303858.ch17

Editor Information

  1. 2

    Universita della Calabria, Italy

  2. 3

    Atlantic Geoscience Center, Nova Scotia, Canada

Author Information

  1. Institute of Geological Sciences, University of Wrocław, Cybulskiego 30, 50–205 Wrocłlaw, Poland

Publication History

  1. Published Online: 2 APR 2009
  2. Published Print: 19 OCT 1990

ISBN Information

Print ISBN: 9780632028948

Online ISBN: 9781444303858

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Keywords:

  • large-scale glaciolacustrine foresets;
  • foreset unit, element of Gilbert-type delta;
  • Elsterian and Saalian Glaciation;
  • deposits of Warthian Stadial in Podlasie - glacial, fluvioglacial and lacustrine;
  • Neple foreset sequence;
  • Markov property

Summary

Large-scale glaciolacustrine foresets from a Pleistocene terminal-moraine complex near Neple, eastern Poland, were examined to determine foreset-forming processes. The foresets studied reach 5 m in thickness and consist of inclined beds with dip angles markedly decreasing from 30–40° in the proximal part to 5–15° distally. The foreset beds can be classified into the following lithofacies: gravel, graded sand, massives and, massive to laminated sand, laminated sand, silt, scour-and-fill facies, and contorted deposits. The main foreset-forming processes were: cohesionless debris flow, turbulent density flow, tractional deposition and suspension fallout. The bed-scale rhythmicity in the foresets is believed to represent diurnal fluctuations of depositional conditions controlled by air temperature, meltwater discharge and sediment supply (diurnal rhythms). On a larger scale, foreset segments show decreasing bed thickness and dip angle as well as grain size passing from their older to younger portions, and they are interpreted as the record of seasonal variations (annual cycles).