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Geological Society, London, Special Publications; 2000; v. 173; p. 271-294;
DOI: 10.1144/GSL.SP.2000.173.01.14
© 2000 Geological Society of London

Post-Tethyan Basin Evolution

Tectonosedimentary Evolution of the Miocene Manavgat Basin, Western Taurides, Turkey

Mustafa Karabiyikoglu1, Attila Çiner2, Olivier Monod3, Max Deynoux4, Sevim Tuzcu1 & Sefer Örçen5

1 Mineral Research and Exploration Institute (MTA), Department of Geological Research, TR-06520 Ankara, Turkey karabyk{at}mta.gov.tr
2 Hacettepe University, Department of Geological Engineering, Beytepe, TR-06532 Ankara, Turkey
3 Lab. Géologie Structurale UMR 6530, CNRS-Université d’Orléans, BP 6759, 45067-Orléans Cedex 2, France
4 Ecole et Observatoire des Sciences de la Terre, UMR 7517, CNRS-Université Louis Pasteur, 1 rue Blessig, 67084 Strasbourg Cedex, France
5 Kocaeli University, Department of Geological Engineering, Kocaeli, Turkey

The Manavgat Basin is a northwest-southeast oriented basin that developed on the eastern side of the Isparta Angle, south of the Late Eocene thrust belt of the western Taurides. The Miocene fill of the basin lies unconformably on an imbricated basement, comprising a Mesozoic para-authocthonous carbonate platform overthrust by the Antalya Nappes and Alanya Massif metamorphics. The sedimentary fill is represented by clasticdominated deposits consisting of, in ascending order, a conglomeratic wedge, reefal shelf carbonates, limy mudstones, and calciturbidites with subordinate breccias and conglomerates.

Process-oriented facies analysis of the basin fill indicates a variety of depositional environments ranging from fluvial/alluvial fan and fan-delta complexes through reefal carbonate shelf and forereef slope to slope fan and basin floor. Fluvial/alluvial fan and fan-delta deposits are Burdigalian-Early Langhian in age and represent the initial conglomeratic valley-fill sedimentation during a relative sea-level rise balanced by important sediment supply from relief in the north-northeast hinterland. The continuous relative sea-level rise and a decreasing rate of sediment supply allowed the deposition of transgressive reefal shelf carbonates of Langhian age. Tectonic activity demonstrated by synsedimentary faults resulted in block faulting of the narrow carbonate shelf and foundering of the basin. The rest of the sedimentation consists of the fill of newly created accommodation space. The overall coarsening-upward succession consists of Upper Langhian-Serravallian limy mudstones-calciturbidites and debris flows, overlain by Tortonian coarse-grained fan-delta deposits. The gravity induced character of most of this progradational wedge implies a progressive uplift of the hinterland.