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Geological Society, London, Special Publications; 2005; v. 251; p. 207-216;
DOI: 10.1144/GSL.SP.2005.251.01.14
© 2005 Geological Society of London

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

Michael Wagreich1 & Philipp E. Strauss2

1 Department of Geological Sciences, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria michael.wagreich{at}univie.ac.at
2 OMV AG, Gerasdorfer Strasse 151, A-1211 Vienna, Austria

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.