Department of Geological Engineering

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Akgün, Haluk (125)
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Recent Submissions

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...
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...
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...
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...
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...
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...
Karamadazı Bölgesi’nde (Yahyalı, Kayseri, Orta Anadolu) Yeni Bir Porfiri Keşfi – Çubuklu Cu-Mo Prospekti Gürgen, Müge; İmer, Ali; Serçe, Deniz Can (2024-04-15)
Çatalçam (Manisa) Epitermal Zn-Pb-Au Cevherleşmesi Üzerindeki Yapısal Kontroller İmer, Ali; Ergili, Hilal; Kaymakcı, Nuretdin (2024-04-15)
Simav Bölgesi’nde (Batı Anadolu) Erken Miyosen Döneminde Porfiri Magma Üretkenliğinde Zamana Bağlı Artış Çil, Akın; İmer, Ali; Sayıt, Kaan; Koralay, Osman Ersin; Chiaradia, Massimo; Ulyanov, Alexey; Moritz, Robert (2024-04-15)
Latest Carboniferous–Early Permian Rifting of the Northern Gondwanan Margin and the Opening of the Northern Neotethys: New Evidence from the Carboniferous and Permian Foraminiferal Assemblages from the Beysehir-Hoyran Nappes, Central Taurides (Southern Turkey) Okuyucu, Cengiz; TEKİN, UĞUR KAĞAN; Guzgun, Cagri; Sayıt, Kaan (2024-04-01) The Beyşehir-Hoyran Nappes, one of the tectonostratigraphic units of the Taurides, are thought to be originated from the Izmir-Ankara Ocean (northern branch of Neotethys). In this study, Late Paleozoic rock units from the ...
A Novel VS30 Prediction Strategy Taking Fluid Saturation into Account and a New VS30 Model of Türkiye Okay, Hakan Bora; Özacar, Atilla Arda (2024-04-01) The averaged shear-wave velocity of the top 30 m (VS30) is widely used in earthquake engineering as a proxy to represent site responses. However, the spatial availability of measured VS30 is rather limited, and, so far, a ...
Classification and modification of slake durability test for different types of rocks Ersöz, Timur; Topal, Tamer (2024-04-01) Rocks exposed to atmospheric conditions are subjected to weathering processes driven by numerous factors especially precipitation. The slaking behavior attributed to water-induced weathering particularly affects rocks cont...
Development of half-grabens along the northwestern end of Gediz-Alaşehir Graben: Inferences from morphometric and kinematic analysis Tekin, Taner; Dönmezoğullari, Tamer; Sançar, Taylan; Rojay, Fuat Bora (2024-03-11) Aegean Extensional Province under which evolution was primarily influenced by the interaction of the northward subducting African plate beneath along “Mediterranean Ridge” and the extrusion of the Anatolian continental fra...
Impact of human and natural causes on shrinking Burdur Lake in the semi-arid Mediterranean region of Turkiye Kılıç Germeç, Hatice; Yazıcıgil, Hasan (2024-03-08)

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