Department of Geological Engineering

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Akgün, Haluk (127)
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Recent Submissions

K-Pg transition in neritic limestones: Deciphering the first bio/chemo-stratigraphic records and tectono-sedimentary evolution, eastern Neotethys (NE Türkiye) Köroğlu, Fatih; SARI, BİLAL; KANDEMİR, RAİF; Yılmaz, İsmail Ömer; Özer, Sacit (2025-04-01) Interestingly, the K-Pg transition from the Cretaceous to the Paleogene is the closest to our time and, from today's perspective, the most dramatic extinction that has ever occurred on Earth. Using different methods and li...
New foraminifera from the Changhsingian (Upper Permian) of the Taurides (southern Turkey) with remarks on their evolutionary origins Altıner, Demir; Payne, Jonathan L.; Lehrmann, Daniel J.; Atasoy, Serdar Görkem; Altıner, Sevinç (2025-03-03) Several new foraminiferal taxa are described from the Changhsingian carbonates of southern Turkey, and their evolutionary relationships are discussed within the middle to late Permian time frame. Comprising Retroseptellina...
Municipal landfill site selection using TOPSIS methodology: A case study for Polatlı, Ankara, Türkiye Oner, Gokalp; Akgün, Haluk; KOÇKAR, MUSTAFA KEREM; Kelam, Arzu Arslan (2025-03-01) Polatl & imath;, which is the largest and tenth out of twenty fifth most populated county of Ankara is well known for being one of the most productive agricultural districts in T & uuml;rkiye in terms of its barley and whe...
Multi-stage tectonic record of the Central Sakarya Terrane Basement (NW Turkey): Implications for the Paleozoic evolution of Rheic Ocean and northern Gondwanan margin Yasar, I. Dogancan; Sayıt, Kaan; Miller, Brent V.; Hames, Willis E.; KORALAY, OSMAN ERSİN; Jeong, Youn-Joong; Göncüoğlu, Mehmet Cemal (2025-01-01) In northwestern Turkey, within the Central Sakarya Terrane, the Söğüt Metamorphics is one of the Variscan tectonic units preserved as a pre-Jurassic basement assemblage of the Sakarya Composite Terrane (SCT). It consists o...
Integrated fracture analysis for improved oil recovery in the reefal limestones of Soğucak formation, Northwest Thrace Basin, Türkiye Karaca, Ergin; Yılmaz, İsmail Ömer; ÇİFCİ, GÜNAY; Tortopoğlu, Bulut; Akın, Serhat (2025-01-01) Natural fractures play a crucial role in both exploration and development phases in oil and gas industry, as their network and orientation significantly affect flow and recovery strategies. This study highlights the import...
Implications of Activity Rate Characterization and Fault-Based Partitioning on Probabilistic Seismic Hazard Assessment: A Case Study of Extensional Tectonic Regime in Western Anatolia, Türkiye Shah, Syed Tanvir; Özacar, Atilla Arda; Gülerce, Zeynep (2024-12-01) Complex fault geometries with multiple sets of inclined active faults pose a challenge to the accurate representation of fault-based seismic sources in probabilistic seismic hazard assessment (PSHA). In the absence of slip...
Helium and carbon isotope compositions of thermal fluids in the northeastern Anatolia: Implications for the heat source and volatile flux AYDIN, HARUN; Karakuş, Hüseyin; MUTLU, HALİM; Güleç, Nilgün Türkan (2024-11-20) In this study, we make a quantitative assessment on the volatile flux of mantle-derived fluids and source of volatiles to explain the geologic controls on the transport of volatiles within thermal fluids of northeastern An...
CONODONT BIOSTRATIGRAPHY OF UPPER DEVONIAN TEPHRA BEARING DEPOSITS IN THE ISTANBUL-ZONGULDAK TERRANE, NW TURKEY: INSIGHTS ON THE KELLWASSER EVENTS Atakul-Özdemir, Ayşe; Türkmenoǧlu, Asuman Günal; Göncüoğlu, Mehmet Cemal; Bozkaya, Ömer; Okuyucu, Cengiz (2024-11-01) New evidence for a biostratigraphic assessment of the limestone succession comprising K-bentonite levels exposed in the Yilanli Formation of the Istanbul-Zonguldak Terrane are provided from conodonts at the Gavurpinari qua...
Çank Çömlekte Petrografik Yöntemler Biler, Ceren Nur; Toksoy Köksal, Fatma (Zero To Three, 2024-11-01)
A time-space varying distributed unit hydrograph (TS-DUH) for operational flash flood forecasting using publicly-available datasets Hu, Ying; Wu, Huan; Alfieri, Lorenzo; Gu, Guojun; Yılmaz, Koray Kamil; Li, Chaoqun; Jiang, Lulu; Huang, Zhijun; Chen, Weitian; Wu, Wei; Han, Qinzhe (2024-10-01) Although flash floods originate in upstream (headwater) catchments causing hazards locally, they often occur at short time scales and affect widely while relatively small size catchments respond to intense rainfall systems...
A methodology providing new insights into the flow patterns of karst aquifers: an example from SW Türkiye Maramathas, Athanasios; Katsanou, Konstantina; Sağır, Çağdaş; Baba, Alper; Lambrakis, Nikolaos (2024-10-01) This paper presents a new and innovative methodology for the investigation of karst systems using spring discharge. The behaviour of springs in phase space is investigated by plotting the measurements of spring discharge v...
Significance of the Paleocene olistostrome–turbidite belt (Abant Formation) along the Intra-Pontide Suture, northern Turkey Okay, Aral; Altıner, Demir; Özcan, Ercan; Hakyemez, Aynur (2024-09-02) A belt of Paleocene turbidites with olistostromes, the Abant Formation, crops out for 350 km along the Intra-Pontide Suture in northern Turkey. The suture constitutes the contact between two major Pontide tectonic units, t...
Abrupt climate change at the MIS 5/4 transition recorded in a speleothem from the Eastern Mediterranean Paine, Alice R.; Baldini, James U. L.; Ünal İmer, Ezgi; Wadsworth, Fabian B.; Iveson, Alexander A.; Humphreys, Madeleine C. S.; Brown, Richard J.; Mueller, Wolfgang; Ottley, Christopher J. (2024-09-01) The marine isotope stage (MIS) 5a to 4 transition ( 74 ka) was associated with rapid ice sheet expansion, declining moisture availability globally, and significant upheaval of terrestrial ecosystems across the northern hem...
Numerical and Experimental Approach to Evaluate Microplastic Transport in Saturated Porous Media Okutan, Hande; Sağır, Çağdaş; Kurtuluş, Bedri; Özmen, Hasan Burak; Pekkan, Emrah; Razack, Moumtaz; Le Coustumer, Philippe (2024-09-01) Under varying flow rate conditions, the transport and retention of polydisperse microplastics (MPls), with an average particle size of 16 ± 6 µm, were investigated in saturated porous media. First-order reversible and irre...
Deep Lithospheric Controls on Surface Deformation and Seismicity around the East Anatolian Fault Zone and A3 Triple Junction Delph, Jonathan R.; Darin, Michael H.; Whitney, Donna L.; Cosca, Michael A.; Teyssier, Christian; Kaymakcı, Nuretdin; Eken, Tuna; Reid, Mary R.; Beck, Susan L. (2024-08-01) The East Anatolian Fault Zone (EAFZ) is a plate-bounding strike-slip fault capable of hosting large earthquakes, as demonstrated by the extremely damaging February 2023 Mw 7.8 and Mw 7.7 mainshocks of the Kahramanmaraş ear...
Block Rotations in NW Iran in Response to the Arabia-Eurasia Collision Constrained by Paleomagnetism Niknam, Ali; van der Boon, Annique; Rezaeian, Mahnaz; Kaymakcı, Nuretdin; Langereis, Cor (2024-08-01) Northwest Iran is a seismically active region dominated by NW-SE trending strike-slip faults, such as the North Tabriz and Qosha Dagh faults, and smaller NNE-SSW striking faults. The Bozgush Mountains are shaped by these f...
Assessment of rarity and ecological preferences of the non-marine ostracods (Crustacea) in Çanakkale Province (Türkiye) Yavuzatmaca, Mehmet; Külköylüoğlu, Okan; Ataman, Alper; Ayteğin, Ahmet; Yılmaz, İsmail Ömer (2024-07-01) Rarity as a multidimensional concept has not been discussed for the ostracods along with the effects of physicochemical factors and sedimentation rates of waters on their distribution. We randomly sampled 91 aquatic sites ...
Toridler’in (Güney Türkiye) Çangsingiyen’inden (Üst Permiyen) Yeni Tür Glomomidiellopsis? okayi ve Diğer Yeni Foraminiferler: Evrimsel Kökenleri ve Paleobiyocoğrafik Dağılımları Altıner, Demir; Payne, Jonathan; Lehrmann, Daniel; Atasoy, Serdar Görkem; Altıner, Sevinç (2024-06-10) Güney Türkiye’nin Çangsingiyen karbonatlarından, yeni tür Glomomidiellopsis? okayi’yi de içeren, çok sayıda yeni foraminifer tanımlanmakta ve Orta-Geç Permiyen zaman dilimi içinde evrimsel kökenleri ve paleobiyocoğrafik da...
Delamination Magmatism in Eastern Anatolia: A Geochemical Perspective Aktağ, Alican; Sayıt, Kaan; Furman, Tanya; Peters, Bradley J. (2024-05-01) The Sr-Nd-Hf-Pb isotope geochemistry of the Late Miocene Tunceli Volcanics suggests that they are the products of mixed asthenospheric and lithospheric mantle melts. The combined elemental and mineral chemistry data additi...
İzmir İl Merkezindeki Toprağın Jeokimyasal ve Mineralojik Özelliklerinin Sağlık Açısından Risk Değerlendirmesindeki Önemi Kılıç, Atilla; Toksoy Köksal, Fatma (2024-04-18) İzmir il nüfusunun yaklaşık %25'ini oluşturan Bayraklı, Bornova ve Konak olmak üzere üç ilçeden alınan toprak ve kayaç örneklerinin jeokimyasal özellikleri bu ilçelerin bazı bölgelerinde insanlar için potansiyel sağlık ...

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