Morphotectonic Analysis of the Yenişehir (Bursa) Pull-Apart Basin

The Yenişehir Basin, located in northwestern Türkiye, is a major geological structure formed by complex tectonic processes. This study focuses on the evolution of the basin and examines the structural and morphometric features, tectonic activity, and geophysical results. The active southern branch of the North Anatolian Fault Zone (NAFZ) has been responsible for formation of the Yenişehir Basin as a pull-apart basin. The rotation of the surrounding uplift areas, especially the Gemlik-İznik and İnegöl-Bilecik uplifts, played a crucial role in the development of the basin. The morphometric analysis of the study highlights the impact of tectonic activity on the topography of the basin, including the presence of features such as pressure ridges, relict hills, stream offsets and alluvial fans. Structural elements, including the Yenişehir Fault Zone, the Hayriye-Ayaz Fault and the Sungurpaşa Fault Zone, contribute to the boundaries of the basin and its ongoing tectonic evolution. Gravimetric analyzes confirm an increase in gravity anomalies within the basin, consistent with tectonic activity and structural evolution. In addition, the relative tectonic activity levels provide valuable insights into the evolution of fault systems and their influence on the geomorphology of the region. The results highlight the ongoing tectonic processes, including the extension of the basin and the role of faults in shaping the topography, and contribute to our understanding of the dynamic geological history of the region.