Coastal Alluvial Fans and Associated Marine Facies in the Miocene of S.W. Turkey

  1. J. D. Collinson and
  2. J. Lewin
  1. A. B. Hayward

Published Online: 29 APR 2009

DOI: 10.1002/9781444303773.ch26

Modern and Ancient Fluvial Systems

Modern and Ancient Fluvial Systems

How to Cite

Hayward, A. B. (1983) Coastal Alluvial Fans and Associated Marine Facies in the Miocene of S.W. Turkey, in Modern and Ancient Fluvial Systems (eds J. D. Collinson and J. Lewin), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444303773.ch26

Author Information

  1. Grant Institute of Geology, University of Edinburgh, West Mains Road, Edinburgh, UK

  1. British Petroleum Co., West Britannic House, London E.C. 2, UK

Publication History

  1. Published Online: 29 APR 2009
  2. Published Print: 7 FEB 1983

ISBN Information

Print ISBN: 9780632009978

Online ISBN: 9781444303773

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Keywords:

  • coastal alluvial fans and associated marine facies – Miocene, S.W. Turkey;
  • Mesozoic ophiolitic complex;
  • alluvial fan deposits;
  • shallow marine deposits;
  • conglomerate–sandstone association

Summary

A thick sequence (c. 1000 m) of Miocene clastic sediments was derived from a Mesozoic ophiolitic complex during its tectonic emplacement. The upper 350 m of the sequence, the Kasaba Formation of Upper Miocene age, consists of a diverse assemblage of coastal alluvial fan and shallow marine facies.

Alluvial fan deposits in proximal areas consist of dominantly clast-supported massive conglomerates, interpreted as stream deposits, interbedded with subordinate, matrix-supported conglomerate deposited by debris-flows. These pass down palaeoslope into interbedded conglomerates, sandstones and mudstones which form distinct fining-upward units up to 15 m thick. These are considered to have been deposited on an alluvial braid-plain. Pedogenic calcretes and reddened horizons attest to an arid or semi-arid environment.

Shallow marine deposits are the downslope equivalent of the alluvial braid-plain sediments. Patch reefs which developed along the shoreline protected the shoreface from extensive wave and storm reworking. Offshore material finer than pebble gravel was reworked sporadically, probably by storm-induced currents.

The overall depositional setting is interpreted to be a narrow coastal plain where alluvial fans prograded directly into a shallow microtidal sea.