Pasinler-Horasan Havzası (Erzurum-Türkiye) Pliyosen-Kuvaterner Yaşlı Gölsel Sedimanlarındaki Yumuşak Çökel Deformasyon Yapılarının Oluşum Mekanizması ve Bölgesel Jeodinamikler ile İlişkisi

Abstract

Soft-sediment deformation structures of different types are frequently observed in the Pliocene–Quaternary lacustrine deposits of Pasinler-Horasan Basin. These structures are located in four locations in the basin (Yukarı Tahirhoca-1, Yukarı Tahirhoca-2, Karacaören, and İncesu) at different levels within fine gravelly, sandy and silty sediments. According to their morphological features, the formation mechanisms of these structures, defined as flame structure, load structure, convolute structure, slump structure, dish-and-pillar structure and ball-and-pillow structure, were interpreted by considering sedimentological features, stratigraphic location and regional factors. With these data, it was revealed that soft sediment deformation structures were formed by the effect of overloading effect and seismic tremors. While rapid sediment accumulation and underwater mass movements constitute the overloading effect that creates some of the deformation structures, seismic tremors with a magnitude of M ≥ 5 constitute the other triggering mechanism. The Horasan-Şenkaya, Tutak and Karayazı faults, which are very close to the liquefaction areas (< 35 km), have the potential to produce the seismic shocks necessary for deformation. © 2025, Hacettepe Universitesi Yerbilmleri. All rights reserved.