Shortening and extrusion in the East Anatolian Plateau: How was Neogene Arabia-Eurasia convergence tectonically accommodated?

作者：Douwe J.J. van Hinsbergen, Derya Gürer, Ayten Koç, Nalan Lom · 发表于：Earth and Planetary Science Letters · 年份：2024 · DOI：10.1016/j.epsl.2024.118827 · 被引用次数：19 · 研究领域：earthquake and tectonic studies、Geological and Geochemical Analysis、High-pressure geophysics and materials

• The rise of the East Anatolian Plateau must have been dominantly caused by regionally distributed Neogene crustal thickening. • Anatolian extrusion since the late Miocene only accommodated a small fraction of contemporaneous Arabia-Europe convergence. • Detailed field studies in the East Anatolian Plateau are required to assess seismic hazard associated with regionally distributed shortening. Deformation in orogenic belts is typically widely distributed but may be localized to form discrete, fast-moving fault zones enclosing semi-rigid microplates. An example is the Anatolian microplate, which is extruding westwards from the East Anatolian Plateau in the Arabia-Eurasia collision zone along the North and East Anatolian Faults that cause devastating earthquakes, including those of February 6, 2023 in Southeast Anatolia. Here, we summarize the orogenic architecture of the East Anatolian Plateau and its underlying kinematic history since the Cretaceous, and use this to reconstruct the tectonic situation that existed at the onset of and during the development of the Neogene East Anatolian Plateau and the Anatolian microplate. The orogen first formed in the late Cretaceous by subduction-accretion of microcontinental lithosphere below Neotethys oceanic lithosphere. Then, in Paleogene time, the accretionary orogen underwent regional upper plate extension, causing crystalline crust exhumation and deep-marine basin formation. From early Miocene time onwards, the extended orogen short...