Morphotectonic evolution of Mavibogaz canyon and Sugla polje, SW central Anatolia, Turkey


DOĞAN U., Kocyigit A.

GEOMORPHOLOGY, cilt.306, ss.13-27, 2018 (SCI İndekslerine Giren Dergi) identifier identifier

Özet

This study focuses on the morphotectonic evolutionary history of two significant geomorphic features, Sugla structural-border polje and Mavibogaz canyon, located within the Sugla-Seydisehir, Akoren-Kavakkoy, and Bozlir grabens in the central Taurides. Data were obtained by detailed field mapping of faults, rocks, and geomorphic features. Three phases of tectonic deformation were determined. The three erosional surfaces developed, especially in the form of tectonically controlled steps, during Oligocene-early Miocene, middle Miocene, and late Miocene-early Pliocene, sequentially. Southwest- to northeast-trending karstified hanging paleovalleys are present on the high erosional surfaces, which have been attributed to the end of early Miocene and late Miocene. Faulting-induced tectonic movements enabled the formation of Sugla-Seydisehir paleograben in early Miocene. We suggest that the Mavibogaz canyon was formed by captures at the beginning of late Miocene and late Pliocene and by incision in Late Pliocene-Quaternary, depending on the headward erosion of Carsamba River. Starting from the beginning of Quaternary, a tensional neotectonic regime became prominent and then a series of modern graben-horst structures formed along the reactivated older grabens. One of these is the Sugla-Seydisehir reactivated graben. Sugla structural-border polje developed within the graben. Total visible tectonic subsidence of the polje is 134 m. Underground capture of surface water occurred on the southern slopes of the graben. Waters of Sugla polje are transported intermittently into Konya basin on the surface and into the Mediterranean basin via natural swallow holes. Beach deposits, water marks, cliffs, and notches marking the late Pleistocene lake level (10 m) and two perched corrosion surfaces (-50 and 22 m) were detected around the polje. (C) 2018 Elsevier B.V. All rights reserved.