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Source area and tectonic control on alluvial-fan development in the Miocene Fohnsdorf intramontane basin, Austria

By
Michael Wagreich
Michael Wagreich
Department of Geological Sciences, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria (e-mail: michael.wagreich@univie.ac.at)
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Philipp E. Strauss
Philipp E. Strauss
OMV AG, Gerasdorfer Strasse 151, A-1211 Vienna, Austria
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Published:
January 01, 2005

Abstract

Middle Miocene alluvial fans in the intramontane Fohnsdorf Basin of the Eastern Alps originated along normal faults and linked strike-slip faults in a continental half-graben setting. The fans display considerable facies differences. Debris flows of the Rachau fan are characterized by a sandy matrix and large boulders, whereas debris flows of the Apfelberg fan are characterized by higher silt and clay content and smaller clasts. Key control of debris-flow facies is the lithology contrast in the fan source areas. Sand, pebbles and large outsized boulders originated predominantly from the resistant augengneiss- and amphibolite-dominated hinterland of the Rachau fan, whereas a significant higher proportion of mud and silt and smaller boulders have been derived from the Apfelberg fan catchment, which was dominated by mica schists and marble.

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Contents

Geological Society, London, Special Publications

Alluvial Fans: Geomorphology, Sedimentology, Dynamics

A. M. Harvey
A. M. Harvey
University of Liverpool, UK
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A. E. Mather
A. E. Mather
University of Plymouth, UK
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M. Stokes
M. Stokes
University of Plymouth, UK
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Geological Society of London
Volume
251
ISBN electronic:
9781862394995
Publication date:
January 01, 2005

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