Lofer Cycles of the Upper Triassic Dachstein Platform in the Transdanubian Mid-Mountains (Hungary)

  1. P. L. de Boer2 and
  2. D. G. Smith3
  1. J. Haas

Published Online: 29 APR 2009

DOI: 10.1002/9781444304039.ch20

Orbital Forcing and Cyclic Sequences

Orbital Forcing and Cyclic Sequences

How to Cite

Haas, J. (1994) Lofer Cycles of the Upper Triassic Dachstein Platform in the Transdanubian Mid-Mountains (Hungary), in Orbital Forcing and Cyclic Sequences (eds P. L. de Boer and D. G. Smith), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444304039.ch20

Editor Information

  1. 2

    Utrecht, The Netherlands

  2. 3

    London, UK

Author Information

  1. Geological Research Group of Hungarian Academy of Sciences, H-1088 Budapest Múzeum krt. 4/a, Hungary

Publication History

  1. Published Online: 29 APR 2009
  2. Published Print: 28 JAN 1994

ISBN Information

Print ISBN: 9780632037360

Online ISBN: 9781444304039

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Keywords:

  • Lofer cycles of Triassic Dachstein platform;
  • frequency of cycle types in sequences of carbonate platform;
  • Markov analysis;
  • stacking patterns of various lithogenic units;
  • diagenetic processes controlled by sea level changes

Summary

Lofer cycles are lagoonal–peritidal cycles that are characteristic of extremely thick and broad carbonate platforms along the margin of the Upper Triassic Tethys. In the Transdanubian Mid-Mountains borehole sections expose continuous sequences of the cyclic platform carbonates several hundred metres thick. Sedimentological investigations and statistical analyses have revealed that the cycles consist of symmetric and asymmetric sequences 2–5m thick. The ideal cycle is fairly symmetric but many cycles are condensed or incomplete and truncated. The cycles are related to relatively small-scale sea-level variations, which has resulted in considerable lateral facies migrations on a wide, marginal carbonate platform. Periodicities are estimated to range between 20 and 40 ka, and are suggestive of orbital control.