Bora Rojay

Middle East Technical University | METU · Department of Geological Engineering

Lateral movement of lithospheric fragments along strike-slip faults in response to collision (escape tectonics) has characterized convergent settings since the onset of plate tectonics and is a mechanism for the formation of new plates. The Anatolian plate was created by the sequential connection of strike-slip faults following ≥10 m.y. of distribu...

The Anatolia (Eurasia), Arabia, and Africa tec­tonic plates intersect in southeast Turkey, near the Gulf of İskenderun, forming a tectonically active and unstable triple junction (the A3 triple junction). The plate boundaries are marked by broad zones of major, dominantly left-lateral transform faults including the East Anatolian fault zone (the An...

Situated within the interior of the Central Anatolian Plateau (Turkey), the 200-km-long Tuzgölü extensional fault zone offers first-order constraints on the timing and pattern of regional deformation and uplift. In this study, we analyze the morphometrics of catchments along the Tuzgölü range-front fault and the parallel, basinward Hamzalı fault us...

Unlike the rodents of the local zone C (MN 2) fauna of Gökler, the faunal list of the insectivores shows little surprises. The fauna is dominated by the gymnure Galerix saratji and the enigmatic talpid Suleimania ruemkae, both present in such numbers that for the first time the anterior dentition could be reconstructed. In the case of Galerix, thes...

Pliocene leporid remains are very rare in Anatolia, occurring sporadically only in a few localities. The new locality of Tepe Alagöz (Çankırı Basin) is the first reported Pliocene locality in Turkey with sufficiently rich leporid material for determination of morphometric variability in taxonomically important teeth. The locality also yielded remai...

The Tuz Gölü Basin is the largest sedimentary depression located at the center of the Central Anatolian Plateau, an extensive, low-relief region with elevations of ca. 1 km located between the Pontide and Tauride mountains. Presently, the basin morphology and sedimentation processes are mainly controlled by the extensional Tuz Gölü Fault Zone in th...

The rich and relatively diverse fossil mammalian assemblage from Gökler is of special importance for understanding of faunal evolution in Central Anatolia. Large mammals were not recovered, but insectivores and rodents are abundant. The assemblage of rodents is studied in detail and comprises mainly diversified cricetids. Dormice are abundant, but...

The SE part of Turkey is characterized by a transtensional regime within the complex collision zone between the Anatolian, Arabian and African plates, which is bounded by two main faults, Dead Sea Fault and its splays on east and the Karasu Fault on west. In this tectonic and geodynamic context developed the Amik and further North, Erzin and Toprak...

ESF-Tübitak Vertical Anatolia Movement Project report

Although much of the deformation associated with Arabia­Eurasia collision and Aegean extension is expressed by westward translation of Central Anatolia along the North Anatolian and East Anatolian fault zones, important deformation also takes place in the interior. Major interior faults include the NE­SW striking, left­lateral Central Anatolian fau...

Although much of the deformation associated with Arabia­Eurasia collision and Aegean extension is expressed by westward translation of Central Anatolia along the North Anatolian and East Anatolian fault zones, important deformation also takes place in the interior. Major interior faults include the NE­SW striking, left­lateral Central Anatolian fau...

Central Anatolia, located on the immense Alpine-Himalayan orogenic belt, has a complicated neotectonic evolution, and NE–SW-trending Neogene horsts-graben systems that rejuvenate pre-existing palaeostructures are among the most important structures which help us understand the tectonic evolution of Central Anatolia. Post-Miocene deformational studi...

a b s t r a c t The chaotic tectonic belt, which is distinguished in northern Anatolia, is called the – Ankara Accretionary Complex – in the Ankara region, central Anatolia. The belt is differentiated into three imbricated tectonic subbelts, namely, pre-Triassic metamorphics, Mélange with calcareous blocks and Cretaceous mélange with ophiolitic blo...

The Central Anatolian Plateau (CAP) in central Turkey, much like its larger counterparts in Tibet or the Andes, has a clear influence on regional atmospheric circulations and thus creates a distinct pattern of orographic rainout and rainshadow. Reconstructing these patterns over geological time is a major challenge for understanding the interplay o...

Post-Miocene extension in Central Anatolia; It's linkage to Aegean extension Anatolian Plate, -where Central Anatolia situated on-, escapes westward onto African plate along Eastern Mediterranean-Cyprus subduction zone, sliding by North and East Anatolian faults. Central Anatolia is bounded by dextral North Anatolian Fault from north, Taurides from...

Geochemistry of free and dissolved gases in the Amik basin area (Turkey) and its relationships with the tectonic setting

The Tuz Gölü Basin is the largest sedimentary depression located at the center of the Central Anatolian Plateau, an extensive, low-relief region with elevations of ca. 1 km located between the Pontide and Tauride mountains. Presently, the basin morphology and sedimentation processes are mainly controlled by the extensional Tuz Gölü Fault Zone in th...

Paleoelevation reconstructions of mountain belts and orogenic plateaus based on stable isotope climate and precipitation records benefit greatly from present-day calibrations that relate the fractionation of hydrogen (δD) and oxygen (δ18O) isotopes in precipitation to orographic rainfall. Here, we establish a first-order template of δD and δ18O of...

In this paper, new paleomagnetic and anisotropy of magnetic susceptibility (AMS) data from Miocene continental units of the Çankırı Basin are presented, with the main goal of providing additional constraints on its deformational and rotational history during the Late Cenozoic. AMS data indicate a tectonic origin for the magnetic fabric, suggesting...

The Çankiri Basin, located in the northern part of the Central Anatolian Plateau, is a large Tertiary basin where thick Miocene to Quaternary continental sediments overlay the Cretaceous-Tertiary units. This investigation focuses on the Tuǧlu Formation, an Upper Miocene succession mainly composed of dark grey silty and organic rich clays. The type...

Isotope geochemistry of lacustrine carbonate represents a powerful tool to reconstruct paleoclimatic and paleoenvironmental conditions. Here, we present a comprehensive set of long-term oxygen (δ18O) and carbon (δ13C) stable isotope records from 5 Chattian to Burdigalian lacustrine sequences distributed over the Central Anatolian Plateau. Field rel...

The southwest margin of the Central Anatolian Plateau has experienced multiple phases of topographic growth, including the formation of localized highs prior to the Late Miocene that were later affected by wholesale uplift of the plateau margin. Our new biostratigraphic data limit the age of uplifted marine sediments at the southwest plateau margin...

The existences of the gross structures are crucial elements in the understanding of the Neogene evolution of the Anatolia. The structures, from north to south, are fairly documented extensional Black Sea coast structures, "N vergent tectonics" in Black Sea region, the cross cutting scar/shear zone -North Anatolian Fault- , S verging tectonics in ce...

Th e North Anatolian Fault System (NAFS) that separates the Eurasian plate in the north from the Anatolian microplate in the south is an intracontinental transform plate boundary. Its course makes a northward convex arch-shaped pattern by fl exure in its central part between Ladik in the east and Kargı in the west. A number of strike-slip basins of...

The existences of the gross structures are crucial elements in the understanding of the Neogene evolution of the Anatolia. The structures, from north to south, are fairly documented extensional Black Sea coast structures, "N vergent tectonics" in Black Sea region, the cross cutting scar/shear zone-North Anatolian FaultS S verging tectonics in centr...

One of the major tasks in terrestrial paleoclimate research is the reconstruction of continental precipitation changes and its effect on vegetation patterns as well as animal and human environments. Stable isotopes in precipitation have become increasingly important for characterizing various effects of surface uplift-related climate change and the...

This project aims the understanding of the competing processes (tectonics, geomorphic and climate) that control the development of the Central Anatolia Plateau (CAP). The study covers a 400 km large area from Black Sea to Mediterranean Sea including the northern part of Cyprus. The interior of CAP that reach 1500 m high denudated topography is char...

Long-term stable isotope records of terrestrial environments represent increasingly important tools for tectonic, paleoaltimetric, and paleoclimatic reconstructions within continental interiors. A rapidly growing number of studies within the Earth's major mountain ranges demonstrates that the growth of topography and orogenic plateaus profoundly in...

The Karayasmak ultramafic–mafic association (KUMA) in NE Turkey represents an Alaskan-type, pre-Liassic intrusion in the Pulur metamorphic massif and is one of many such intrusive complexes that were emplaced into the continental basement of the Eastern Pontides belt during the pre-Liassic. Its main lithological units include plagioclase peridotite...

The Eastern Pontides is deformed by the existence of the huge Mesozoic-Tertiary, magmatic arc at the axial line, as being the member of the Pontide Belt that extends from Biga peninsula in west to Caucasia in east. A transect from North Anatolian fault zone in south to Black Sea coast in north will be presented to bave a well understandable section...

The western Anatolian multi-directional extensional terrain developed as a result of the anti-clockwise westward migration of the Anatolian Block onto African Plate along the Mediterranean Ridge in between the North Anatolian Fault in north and East Anatolian-Dead Sea Fault in south-southeast. The multi-directed horst-graben system of the western A...

Neogene volcanic rocks and granitoid plutons are among the most important geological components of western Turkey. Although they are voluminous north of the Gediz Graben, they are very scarce to the south, where volcanic rocks occur as isolated small exposures in a small number of localities. The Kiraz Basin of the Küçük Menderes Graben is a key lo...

With elevations of several kilometers, low local relief and pronounced relief contrasts with surrounding regions, orogenic plateaus are first-order tectonic and topographic features of several Cenozoic mountain belts. The morphologic characteristics of plateaus may result from efficient tectonic uplift of mountain ranges that successively incorpora...

Central Anatolia, located on the immense Alpine-Himalayan orogenic belt, has a complicated neotectonic evolution, and NE–SW-trending Neogene horsts-graben systems that rejuvenate pre-existing palaeostructures are among the most important structures which help us understand the tectonic evolution of Central Anatolia. Post-Miocene deformational studi...

This study investigates the origin and regional tectonic implications of high-altitude Plio (?)–Quaternary fluvial deposits developed over the Bozdag ˘ horst which is an important structural element within the horst–graben system of western Anatolia, Turkey. A total of 23 deposits occur near the modern drainage divide comprising fluvial to occasion...

The Küçük Menderes Graben (KMG) is part of the horst-graben system of southwestern Anatolia (Turkey), bounded by the Bozda… horst in the north and the Ayd¬n horst in the south. The Plio-Quaternary evolution of the KMG has been evaluated using the nature of the Miocene-Quaternary fill sediments and palaeostress analysis of slip data measured in diff...

Western Anatolia (Turkey) is a region of widespread active N-S continental extension that forms the eastern part of the Aegean extensional province. The extension in the region is expressed by two distinct/different structural styles, separated by a short-term gap: (1) rapid exhumation of metamorphic core complexes along presently low-angle ductile...

Western Anatolia (Turkey) is a region of widespread active N-S continental extension that forms the eastern part of the Aegean exten-sional province. The extension in the region is expressed by two distinct/different structural styles, separated by a short-term gap: (1) rapid exhumation of metamorphic core complexes along presently low-angle ductil...

The coastal face of Büyük Menderes River is characterized by a complex system of lagoons, inlets, lakes, natural levees, beach ridges and river promontories. The geomorphological aspects of this complex system had been studied by means of aerial photographs and archive topographical maps. Three different periods of dataset is used where the earlies...

The most widespread blocks within the Cretaceous ophiolitic mélange (North Anatolian ophiolitic mélange) in Central Anatolia (Tur-key) are pillow basalts, radiolarites, other ophiolitic fragments and Jurassic-Cretaceous carbonate blocks. The pillow basalts crop out as discrete blocks in close relation to radiolarites and ophiolitic units in Cretace...

The Karasu Rift (Antakya province, SE Turkey) has developed between east-dipping, NNE-striking faults of the Karasu fault zone, which define the western margin of the rift and west-dipping, N–S to N20°–30°E-striking faults of Dead Sea Transform fault zone (DST) in the central part and eastern margin of the rift. The strand of the Karasu fault zone...

The most widespread blocks within the North Anatolian ophiolitic mŽlange of central Anatolia (Turkey) are ophiolitic fragments, Jurassic-Cretaceous carbonate blocks and pillow basalts. The blocks of pillow basalts have an immobile trace-element geochemistry that is characteristic of ocean-island alkali basalts. An N-MORBnormalized spider diagram sh...

Riassunto. Nelle Pontieli, la deposizione dei carbonati del Giu-rassico-Cretacico Inferi~re fu controllata dall' evoluzione di un margi-ne continentale di tipo atlantico rivolto verso la Tetide. 1.0 studio di nwnerose sezioni stratigrafiche da scaglie e blocchi alloC!oni del Melan-ge Ofiolitico dell Anatolia Settentrionale, ha permesso di analizzar...

In northern Anatolia along the Izmir-Ankara-Erzurum Suture, the low-grade metamorphics display strong protolithologic similarities. However, the classification of these metamorphics with respect to ' their prototithological stratigraphy, internal organization, age and boundary relations are still not clear due to limited number of metamorphic studi...

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In Northern Anatolia, along the Izmir-Ankara-Erzincan Suture Belt, low grade metamorphic assemblages display strong similarities in their pre-metamorphic stratigraphy. However, the classification of these assemblages with respect to their stratigraphy, internal organization, age and boundary relations is still not clear due to limited number of stu...

The Central Pontides is an orogenic belt evolved since Triassic by the progressive closure of Paleo- and Neo-Tethys oceans, which is bounded by the IzmirAnkara-Erzincan Suture (Northern Neotethyan Suture) from the south. The post-Triassic Neo-Tethyan evolution in Amasya region started with Liassic transgression on the rifted pre-Liassic basement ro...

The Of-Solakli Hydropower Development Project (HDP) is designed to generate 380 MW of electricity through the diversion of six streams into a headrace tunnel and maintaining a head difference of 1 000 m above the underground power station. The tunnel system is located within felsic and mafic magmatic rocks, and volcanogenic flysch. In this paper a...

Geological maps, lithology, structural geology of western CACC

Based on both the detailed field and laboratory studies carried out at the north of Ankara, northwest of Amasya and south of Tokat in northern Turkey, the presence of remnants of different types of forearc .basin at the active margin of Northern Neo-Tethys has been found. The forearc deposits exposed at these localities are underlain either by only...

The ‹smetpafla-Karg› section of the North Anatolian Fault System (NAFS) consists of six subfault zones, namely the Eskipazar, the Ulusu, the Tosya, the Çerkefl-Kurflunlu, the Devrez and the newly detected Dodurga fault zone (DFZ). Together these fault zones form a well-developed dextral strike-slip-faulting pattern, in which the DFZ is an antitheti...