Comparative New Insight into the Tectonic Origin of Folds and Thrust Faults of an Extensional Basin: Söke-Kuşadasi Basin, Aegean, Western Turkey

Abstract

The Aegean area of the western Anatolian region of Turkey, controlled by the low-angle detachment normal fault system, forms an extensional province, the West Anatolian Extensional Province (WAEP). The tectonic deformation which occurred in the Miocene Period, including the Plio-Quaternary Period has created different structures in both the basement rocks and intra-basin deposits of the crust. One of these structures, high-angle normal faults, controls the supradetachment Söke-Kuşadasi Basin (SKB). Within this basin, there are folds with different axes and thrust faults with a north-northwest-northeast (N, NW, NE) trend. These folds and thrust faults in the SKB deformed the sedimentary structures of intra-basin deposits. The folds and thrust faults, which caused the rotation of beddings and imbrications in the SKB, are mainly associated with the tectonic process of the low angle detachment normal fault, which affected the SKB and the Aegean part of western Anatolia. In the SKB, during the process of extensional deformation associated with primary low angle detachment normal faulting, the ramp-flat and inversion geometry observed in the basement rocks and basin deposits of the crust caused folds and thrust faults in only intra-basin deposits. In the WAEP, it is determined for the first time that the folds and thrust faults causing limited shortening deformed the Plio-Quaternary sediments.

Keywords

low angle detachment normal fault / high angle normal fault / fold / thrust fault / bedding / extensional supradetachment basin

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