Browsing by Author "Erturac, M. Korhan"

Now showing 1 - 3 of 3

Evolution of Camlik Fissure-Ridge Travertines in the Baskale Basin (Van, Eastern Anatolia)
(Taylor & Francis Ltd, 2017) Selcuk, Azad Saglam; Erturac, M. Korhan; Uner, Serkan; Ozsayin, Erman; Pons-Branchu, Edwige
Fissure-ridge travertines (FRTs) are of great importance for the determination and comparison of tectonic deformation in a region. The coeval development of these travertines with active fault zones supplies significant information about regional dynamics in terms of deformation pattern and evolution. In this paper, the characteristics of FRTs of the Baskale basin (eastern Turkey) and responsible regional tectonism are discussed for the first time. The Baskale basin is located between the Baskale Fault Zone (BFZ) characterised by Camlik fault and Isikli-Ziranis fault. It is located between dextral Yuksekova Fault Zone and southern end of dextral Guilato-Siahcheshmeh-Khoy Fault system (Iran). Various morphological features indicating recent activity are exposed along the BFZ, including offsetting rivers, fissure-ridge travertine and fault scarps. The Camlik fissure-ridge travertine composing of three different depositions is observed along the eastern edge of the BFZ with approximately parallel orientations. The Famlik fissure-ridge travertine has been formed and developed on fault zone related to strike-slip or oblique movements. We explain how kinematic changes of faults can influence the fissure-ridge development.
Geology of the Caldiran Fault, Eastern Turkey: Age, Slip Rate and Implications on the Characteristic Slip Behaviour
(Elsevier, 2016) Selcuk, Azad Saglam; Erturac, M. Korhan; Nomade, Sebastien
The Caldiran Fault is a strike slip fault with a dextral slip in East Anatolia. The activity on this fault was marked by the November, 241976 earthquake (Mw: 7.1) which produced an similar to 50 km long surface rupture and caused 3840 fatalities, which was close to half of the population living along the fault at that time. Together with the North Tabriz Fault in Iran, it is regarded as the southern boundary of the Caucasus Block. The fault has an average annual slip rate of 8.1 from 10.8 mm yr(-1), as derived from elastic block modelling. We present results from a detailed morphotectonic survey along the fault. The Caldiran Fault is comprised of three segments, each of which is eparated by bend structures that bend towards the SW with a total change in strike of 20 degrees from east to west. The offsets of lithological contact markers show that the long-term geological slip rate for the Caldiran fault is approximately 3.27 +/- 0.17 mm yr(-1) for a duration of approximately 290 ka. The cumulative offset of the fault was determined from an analysis of a dome-shaped rhyolitic volcano which constrained the age of the fault to the Middle-Late Pleistocene. An analysis of small-scale morphological offset markers indicates a characteristic slip behaviour of the Caldiran Fault for the last 3 events with an average offset of 2.6 m. (C) 2016 Elsevier B.V. All rights reserved.
The Importance of the Geomorphological and Volcanological Indicators in Determining Obsidian Source Areas
(Tmmob Jeoloji Muhendisleri Odasi, 2017) Akkopru, Ebru; Mouralis, Damase; Robin, Anne-Kyria; Kuzucuoglu, Catherine; Erturac, M. Korhan
As understood from the artifacts found in the archaeological excavation areas, the obsidian belonging to the volcanic areas of the Eastern Anatolian Region spread to a very wide area by being traded in prehistoric times. For this reason, it is important to carry out a study on obsidian diffusion and volcanic-geomorphological features in the Eastern Anatolia Region. In this study, the importance of volcanological and geomorphological indicators in the determination of obsidian sources is given by examplifying field studies with geomorphological and geological approaches in the volcanic areas of Eastern Anatolia Region The basic characteristics of obsidian (color, texture, durability, hardness, etc.) presence, quantity and availability as raw materials are closely related with volcanic and geomorphological processes. For example; The chemical and physical properties of the obsidian appear largely under the control of volcanism. Magmatic processes play an important role in the spread of the obsidian surface areas and in the formation types (dom, dyke, flow, etc.). The presence of obsidian in a volcanic massif is the result of volcanism, but at the same time, its continuation in the same area later also depends on the type and severity of the entire erosion process. Namely, the next volcanic activity and or erosional processes in the volcanic area may cause the obsidian to fossilize or be completely eroded and destroyed. In addition, this kind of effect also changes the presence and proportion of obsidian in the colluvial and alluvial material known as secondary sources on the area.