Zechstein (Ca1) limestone-marl alternations from the North-Sudetic Basin, Poland: depositional or diagenetic rhythms?

Authors

  • Julita Biernacka Institute of Geology, Adam Mickiewicz University, Maków Polnych 16, PL-61-606 Poznań, Poland
  • Katarzyna Borysiuk Poznań Radiocarbon Laboratory, Rubież 46, PL-61-612 Poznań
  • Paweł Raczyński Institute of Geological Sciences, University of Wrocław, Pl. M. Borna 9, PL-50-204 Wrocław, Poland

Keywords:

Zechstein, limestone-marl alternations, storm deposits, carbonate diagenesis

Abstract

Limestone-marl alternations constitute a characteristic rock facies within the Zechstein Limestone (Ca1) deposits of the North-Sudetic Basin, Poland. Rhythmites of this type are exposed in a 10-metres section at Nowy Kooeciół, which from the beginning of the last century has been considered representative for this part of the Zechstein basin, and were formerly interpreted as calcareous storm sediments alternating with marls deposited during more quiet conditions. Our results of sedimentological, petrographical and chemical studies suggest that the Nowy Kooeciół section is a record of distal storm deposits, but that the present-day layering does not precisely reflect the depositional rhythm. Post-depositional changes have overprinted and blurred the original pattern. We propose a model of diagenetic alteration in which dissolution and reprecipitation of calcium carbonate in the shallow subsurface formed new layer boundaries; subsequent modifications during deeper burial followed these early diagenetic changes.

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Published

2010-03-27

Issue

Vol. 49 No. 1 (2005)

Section

Articles

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