A fault kinematic and geomorphological study of the Late Cenozoic Ilgin Basin, Central Anatolia, Turkey

A fault kinematic and geomorphological study of the Late Cenozoic Ilgin Basin, Central Anatolia, Turkey

Koopman, Marijn

Molengraaff Fonds

2011-09

The Ilgin Basin in Central Anatolia is the southeastern extension of the Akşehir-Afyon Basin, situated at the eastern periphery of the Isparta Angle region. The basin geometry, its patterns of sediment infill and its kinematics are controlled by the interference between Late Cenozoic (i.e. neotectonic) overprints and re-activation of old, largely pre-Cenozoic, structures. This thesis provides new structural and geomorphological data aiming to understand the structural complexities involved with such interference and a critical note about the relevance of outcrop-scale observations for regional-scale interpretations of the associated kinematics. The interconnectivity and interaction between intersecting faults and the presence of pre-existing basement structures in the Ilgin Basin and adjacent basin regions are major complications to the application of the stress inversion method. An integration of outcrop-based fault slip data and structural analysis using a Digital Elevation Model is therefore essential to reconstruct their meaning in terms of kinematic evolution of the Ilgin Basin. Fault geometries and their kinematic analysis indicate that transtension in the Ilgin basin is influenced by a small but geometrically significant, left-lateral shear component. This kinematic model inferred for the Ilgin Basin is not in line and therefore difficult to correlate with the deformation kinematics of Late Cenozoic fault zones to the north and northeast.

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Utrecht University

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