Texture and Structure of Resedimented Conglomerates: Examples from Ksiaz Formation (Famennian-Tournaisian), South-Western Poland

  1. Dorrik A. V. Stow
  1. W. Nemec1,
  2. S. J. Porębski2 and
  3. R. J. Steel3

Published Online: 29 APR 2009

DOI: 10.1002/9781444304473.ch22

Deep-Water Turbidite Systems

Deep-Water Turbidite Systems

How to Cite

Nemec, W., Porębski, S. J. and Steel, R. J. (1991) Texture and Structure of Resedimented Conglomerates: Examples from Ksiaz Formation (Famennian-Tournaisian), South-Western Poland, in Deep-Water Turbidite Systems (ed D. A. V. Stow), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444304473.ch22

Editor Information

  1. Department of Geology, University of Southampton, UK

Author Information

  1. 1

    Institute of Geological Sciences, University of Wrocław, 50–205 Wrocław, Poland

  2. 2

    Institute of Geological Sciences, Polish Academy of Sciences, 31–002 Kraków, Poland

  3. 3

    Geological Institute, University of Bergen, 5014 Bergen, Norway

Publication History

  1. Published Online: 29 APR 2009
  2. Published Print: 11 NOV 1991

ISBN Information

Print ISBN: 9780632032624

Online ISBN: 9781444304473

SEARCH

Keywords:

  • Famennian-Tournaisian conglomerates;
  • clast-supported conglomerate beds;
  • inversely graded beds;
  • resedimented conglomerate beds;
  • downfan trends

Summary

The Famennian–Tournaisian conglomerates and sandstones of the Książ Formation are interpreted as marine resedimented deposits. Matrix- and clast-supported conglomerate beds are equally common, and two textural sequences (motifs) have been recognized: (I) matrix-rich conglomerate[RIGHTWARDS ARROW]pebbly sandstone[RIGHTWARDS ARROW]sandstone, and (II) clast-supported conglomerate[RIGHTWARDS ARROW]sandstone. Variation in clast type partly controls motif type, and therefore, to some extent, matrix percentage in the conglomerates generally. Grading is extremely common in both clast- and matrix-supported conglomerates: inverse (19%), inverse-to-normal (14%) and normal (26%). The studied succession, itself part of a 4 km thick, fan delta, basin-fill sequence, is organized into large (110–150 m) and small-scale (5–30 m) sequences, both of which show (1) upward coarsening and thickening, (2) upward trend of sandstones and pebbly sandstone[RIGHTWARDS ARROW]matrix-rich conglomerates[RIGHTWARDS ARROW]clast-supported conglomerates and (3) a less clear upward tendency of massive and normally graded beds[RIGHTWARDS ARROW]inversely graded beds. Variation in matrix percentage in beds is therefore also partly controlled by fan processes, during the progradation of fan bodies and lobes. It is predicted that individual resedimented conglomerate beds or motifs show general downfan trends in thickness, texture and structure opposite to those evident in the vertical sequences.