Profile URL: https://hdl.handle.net/20.500.13091/11673
Job Title:Dr. Öğr. Üyesi
Email Address:ggkorkmaz@ktun.edu.tr
Main Affiliation:02.07. Department of Geological Engineering
Status: Current Staff
ORCID:
0000-0003-0185-2806
0000-0003-0185-2806Scopus ID:
57193251403
57193251403YÖK Akademik: 9D4B784CF57DC441
Google Scholar:
dPb5DdEAAAAJ
dPb5DdEAAAAJWeb of Science ID:
AAD-5040-2020
AAD-5040-2020Name Variants:
Gençoğlu Korkmaz, G. Gencoglu Korkmaz, G.
42 results
Scholarly Output Search Results
Now showing 1 - 10 of 42
Article Citation - WoS: 2Konya İlinin Doğal Varlıkları ve Jeolojik Miras Potansiyeli(TMMOB Jeoloji Muhendisleri Odasi, 2023) Kazancı, Nizamettin; Gençoğlu Korkmaz, Gülin; Korkmaz, Gulin GencogluDoğal ve/veya jeolojik miras şehirlere değer katan ve kimlik kazandıran varlıklar olup giderek daha çok dikkat çekmekte ve korunmasına özen gösterilmektedir. Jeolojik miras, bulunduğu bölgenin jeolojik evrimini ve o evrimdeki çok önemli olayları temsil eder. Mevcut bilimsel veriler ışığında jeolojik mirasın belirlenmesi, envanterinin yapılması yerbilimcilerin, bunların tescili ve koruma önlemlerinin alınması, yerel kalkınma için kullanılması ise karar vericilerin sorumluluğundadır. Bu çalışmada, Jeolojik Mirası Koruma Derneği’nin (JEMİRKO) kayıtlarından yararlanılarak, Konya il merkezi ve ilçelerinde var olan jeolojik mirasın tanıtılması ve niteliklerinin tespiti amaçlanmıştır. Araştırma henüz başlangıç aşamasında olup zamanla daha da genişletilecektir. İncelemeler Konya’da, çoğunluğu uluslararası nitelikte 61 jeositin varlığını göstermektedir. Bunlara ilaveten 22 doğal miras ve 9 tescilli alan (milli park, tabiat parkı) bulunmakta olup bu potansiyel, bölge için eşsiz bir jeoturizm fırsatı sunmaktadır.Conference Object Article Multidisciplinary Insights into Zeolite and Clay Formation in Hydrothermally Altered Volcanic Rocks of Cubuk, Turkey(Cambridge University Press, 2025) Unal Ercan, Hatice; Schroeder, Paul A.; Gencoglu Korkmaz, Gulin; Ece, Omer Isik; Ciftci, Emin; Ercan, Hatice ÜnalThe present study addressed the influence of lithological variability on hydrothermal alteration processes in the Cubuk region of Ankara, recognized globally for its agate occurrences. The objective was to clarify how differing host rocks, tuff and ignimbrite in Karadana, and perlitic units in Yukariemirler, affect secondary mineral formation and alteration pathways. A combination of mineralogical (X-ray diffraction, Fourier-transform infrared spectroscopy, field-emission scanning electron microscopy) and geochemical (energy-dispersive X-ray spectroscopy, whole-rock geochemistry, delta O-18-delta D) methods was utilized to characterize alteration assemblages and fluid conditions. The alteration sequence progressed through five stages, beginning with unaltered volcanic rocks. In the second stage, smectite-group clays, particularly montmorillonite, were formed under mildly alkaline and low-temperature conditions (pH 7.5-9.0; T 43-50 degrees C). This initial clay formation was followed by zeolitization along two distinct pathways: clinoptilolite crystallized (K-rich, Si/Al similar to 4.2) in the Karadana tuff-ignimbrite units, while heulandite formed (Ca-rich, Si/Al similar to 2.7) in the perlitic host rocks of Yukariemirler. These variations are attributed to differences in host-rock composition, permeability, and hydrothermal fluid chemistry. In more advanced stages, mordenite and chabazite precipitated under progressively higher pH and temperature conditions (pH 9.5-10.0; T 70-80 degrees C). In the final stage, opal-quartz formed due to silica supersaturation triggered by a drop in pH, despite rising temperatures (pH similar to 8.5-9.0; T similar to 250 degrees C). The paragenetic sequence confirms that clay mineral formation preceded zeolitization in both zones. Variations in zeolite types reflect strong lithological and hydrochemical controls, as well as the origin of the hydrothermal fluids; clinoptilolite formation in Karadana is associated with Na- and K-rich supergene fluids, while Ca-rich hypogene fluids promoted heulandite precipitation in Yukariemirler. This study presents the first detailed paragenetic model for zeolite-clay alteration in the Cubuk volcanic system and offers new insights into post-caldera hydrothermal evolution in Central Anatolia.Conference Object Laser-Induced Breakdown Spectroscopy (libs) Applications on the Archaeological Cultural Assets(2022) Gençoğlu Korkmaz, Gülin; Gündoğdu, Yasemin; Işık, İlker; Yiğit Gezgin, Serap; Kılıç, Hamdi ŞükürLaser-Induced Breakdown Spectroscopy (LIBS) is a practical and important analytical method for the determination of sample composition in many applications. One of the most common study branches is archaeometry applications. In archaeometry studies, considering the location of the material from which the archaeological sample was made, making qualitative mineralogical - petrographic descriptions of this material (geological samples) on thin sections, and the results obtained by geochemical analyzes are evaluated by taking into account the similarities and differences with the results of the samples bearing the quality of traces. Recently, LIBS is a significant technique for analysis and characterization of the composition of a broad variety of objects of cultural heritage containing icons, painted artworks, pottery, polychromes, sculpture, and metal, glass, and stone artifacts. The fact that the LIBS technique is a non-damaging technique is important in the characterization of archaeological samples. Here we report in brief the basic principles and exhibit the applicability and case studies regarding LIBS applications in the field of archaeological science.Article Geochemical and Mineralogical Differentiation of Tepekent Basalts: a Multivariate Analysis Approach (NW of Konya-Central Anatolia)(2025-03-26) Korkmaz, Gulin GencogluThis study investigates the mineralogical, petrographic, and geochemical characteristics of Miocene-aged basaltic rocks from the Tepekent region to distinguish and correlate them with other members of the Sulutus Volcanic Complex (SVC), particularly the Ulumuhsine and Yükselen basalts. Advanced geostatistical methods such as Principal Component Analysis (PCA), Uniform Manifold Approximation and Projection (UMAP), and k-medoids clustering analysis were applied to correlate the basaltic lava flows. While some overlaps were identified in whole-rock compositions, significant differences were observed in the mineral chemistry. The investigated basalts are primarily composed of plagioclase, with lesser amounts of olivine, pyroxene, and Fe-Ti oxides. Clinopyroxenes from the Tepekent basalts exhibit oscillatory zoning in MgO, CaO, Cr2O3, and TiO2 contents, indicating magma recharge from a more mafic mantle source. Olivine phenocrysts show disequilibrium with their host magma but are in equilibrium with the most mafic Ulumuhsine basalt, suggesting they were derived from earlier solidified phases and subsequently incorporated into the system during magma ascent or convective processes within the magma chamber. Irregular An fluctuations and sieve textures in plagioclase crystals further support the presence of magma replenishment processes. Although isotopic data are indispensable in provenance studies to definitively identify magma sources and establish genetic relationships in greater detail, this study demonstrates how mineral chemistry and geostatistical analyses can effectively differentiate basaltic lava flows and elucidate complex magma chamber processes. The findings highlight the interplay between crustal contamination, mantle-derived magma replenishment, and multi-stage magmatic evolution, providing valuable insights into the volcanic history of Central Anatolia.Article Classification and Generation of the Enclaves in Karapınar-Karacadağ Volcanic Rocks (Central Anatolia)(2021) Korkmaz, Gülin Gençoğlu; Kurt, Hüseyin; Asan, KürşadKarapınar-Karacadağ Volcanic Rocks (KKVR) have very complex magmatic history and outcropped the southwestern part of the Cappadocia Volcanic Province (Central Anatolia). Here we present the petrography and whole-rock chemistry of the enclave-bearing rocks to constrain their source and evolution history. These petrographic observation and geochemical data reveal that the enclaves in the Karapınar-Karacadağ volcanic rocks are magma mixing/mingling enclaves (MME), magma segregation enclaves (MSE), and xenoliths. Here we discriminated these enclaves into eight different types according to their mineral composition and textural features. The magma mixing/mingling enclaves (Type 1, 7, 8) are the mixing products of coeval more felsic and mafic magmas. They show hypocrystalline porphyritic, holocrystalline granular, and intergranular textures, and rich in mafic minerals, and have characteristic petrographic features such as quenched amphibole, bladed biotite, ocelli-quartz, sieved and cellular plagioclases. In andesites they range from basalt to andesite in composition. However, in basalts, they are in basaltic composition. The magma segregation enclaves (Type 2, 4, 5, 6), which are observed in almost all the KKVRs, are cognate xenolith because of plucking from the different parts of the magma chamber. They are holocrystalline and granular in texture. The magma segregation enclaves contained in the andesitic host rocks are hornblende gabbro and pyroxene gabbro in composition, whereas in the basaltic host rocks they are dunite, lherzolite, and basalt in composition. The xenolithic enclaves (Type 3) are observed in the basalts as quartz, plagioclase, biotite, and amphibole xenocrysts. Major oxides and trace element data of the studied rocks indicate that the MSEs are more primitive than their host rocks, and all of the enclaves (MME-MSE) are in accordance with their hosts. According to petrographic observations and geochemical data we propose that fractional crystallization, magma mixing and assimilation processes have a key role in the evolution of the KKVRs and their enclaves.Conference Object A Petrognetic Model for Evidence of Asthenospheric Input Into the Source of Central Anatolia Quaternary Basalts (central Anatolia)(GEOSCIENCE, 2020) Gençoğlu Korkmaz, Gülin; Kurt, HüseyinIn this study, we present for the first time a petrogenetic model of the Quaternary aged nepheline normative Karapınar basalts (Karapınar-Karacadağ Volcanic Complex-KKVC) to explain the asthenospheric material involvement into their source. In recent studies, it has been proved that nepheline normative basalts cannot only be derived from peridotite melts, and they can also be originated from pyroxenite melts. Investigated basalts from KKVC show orogenic pattern in MORB normalized diagram. Although having flat HREE patterns, which is interpreted as originating from garnet-free source in many studies, these basalts may be derived from a garnet bearing source which underwent higher degree partial melting. Their moderate to low Y (< 25 ppm) and low HREE concentrations (Yb < 2 ppm), along with fractionated HREE patterns (Dy/YbN > 1) indicate that garnet was likely to have been involved in the source of the rocks. Furthermore, the most primitive basalts (B1; MgO~10-12 wt%) contain Zn/Fe (*10000) ratio (~16) resembling those of pyroxenite derived melts. Here, we present partial melting and binary mixing models for the Karapınar basalts. The results for modal batch partial melting model of spinel lherzolite and garnet pyroxenite show that mixing between pyroxenitic and peridotitic melts can produce the observed trace element heterogeneities of the most primitive basalts. Although melting model shows that the basalts have plottod into the area between the pyroxenitic and peridotitic sources whose melting degrees are minimum 30% and 5% respectively, the binary mixing model indicates that the rocks were derived from a mixture source of 50% molten pyroxenite and 3% molten peridotite. Furthermore, the mixing model also suggest that the proportion of the pyroxenitic melts in the source should be minimum 45%. According to geochemical data and petrogenetic calculations, we propose a mixing model that nepheline normative basalts were derived from mixing of a peridotitic source with a pyroxenitic source which was brought from the deeper parts of the upper mantle by asthenospheric upwelling.Article The Karadag Stratovolcano: A Multi-Phased Volcanic Geoheritage Area in South-Central Anatolia, Turkiye(Springer Heidelberg, 2026) Korkmaz, Gulin Gencoglu; Kazanci, NizamettinThe Karadag Volcanic Complex (KVC, Central Anatolia) represents a significant example of volcanic geoheritage, where diverse eruptive products, tectonomagmatic evolution, landscape formation, and cultural heritage converge within a single geological framework. This long-lived polygenetic system, characterized by shoshonitic, absarokitic, adakitic, and banakitic lavas, domes, and associated pyroclastics, reflects post-collisional volcanism influenced by transtensional tectonic regimes. Facies analysis enabled the differentiation of central, medial, and distal volcanic domains, encompassing crater-neck structures, intrusive feeder dykes, lava dome and flow units, base-surge and lahar deposits, and distal tephra layers and provides a coherent framework for interpreting eruptive styles, transport mechanisms, and depositional architecture. Sentinel-2 remote sensing data supported the discrimination of volcanic (mafic-felsic), pyroclastic, and sedimentary units and aided in identifying potential geosite candidates. Beyond its volcanological importance, Karadağ preserves a rich archaeological and cultural heritage record embedded directly within its volcanic landscape. Volcanic rocks-particularly dacitic and andesitic lavas-were widely utilized in a range of structures, including functional and defensive constructions (e.g., rock-cut cisterns, fortification remains, and the Roman Pool) as well as religious architecture such as churches. Moreover, the Geosite Assessment Model (GAM) was applied to quantitatively evaluate geoheritage value, indicating consistently high scientific, educational, and management scores across the selected geosites, with most classified in the highest significance category (Z(3,3)). This highlights their priority for geoconservation and sustainable geotourism development. Taken together, the findings of this study demonstrate that Karadağ represents a volcanic geoheritage system of international significance, encompassing multi-phase volcanism and a long-term archive of human-volcano interaction.Conference Object Interpretation of the Magma Chamber Processes of the Andesites From Karacadag Volcanites (central Anatolıa) With the Help of Amphibole Trace Element Data(GEOSCIENCE, 2020) Gençoğlu Korkmaz, Gülin; Asan, KürşadAmphibole major and trace element compositions from 2 different types of andesites from the Karacadağ Volcanites, southwestern part of Capadoccia Volcanic Province, in Konya (Turkey) have been analyzed by electron microprobe and laser ablation inductively coupled plasma mass spectrometry. From the core to the rim, especially the changes in the contents of REE, Li V, Zr, Cr, Ti, Sc, Nb in the amphiboles give considerably significant information about the replenishment processes of the magma, the formation sequence of the minerals and can be a signature to estimate how many different types of amphibole minerals can be found in the rocks. MORB and Chondrite normalized diagrams of the amphibole cores suggest that there are 3 types of amphiboles in the andesites from the Karacadağ Volcanites (in andesite-1 and andesite-2). Type-1 amphibole (GK-80C3), from core to rim, contains Li = 55-67-86-98-52-58 ppm, V = 596-563-506-533-588-626 ppm, Cr = 70-93-30-12-129-47 ppm, Ba = 97-92-99-130-101-105 ppm, Gd = 5.30-4.1-8-5.5-5.5-4.25 ppm. Type-2 amphibole (GK 35C6), from core to rim, has Li = 53-112-97 ppm, V = 496-520-351 ppm, Cr = 10-69-11 ppm, Ba = 166-144-88 ppm, Gd = 14.30-8.40-35.7 ppm. However Type-3 amphibole (GK-6C5) includes Li = 17- 35-50 ppm, V = 475-532-615 ppm, Cr = 137-16-10 ppm, Ba = 131-124-181 ppm, Gd = 5.40-4.74-7.10 ppm. Geothermobarometer calculations of Type-1 amphibole have yielded temperature and pressure estimates 946°C-3.38 kbar, respectively. However for Type-2 and Type-3 amphiboles temperature estimates are 915-1023°C and pressure estimates are 2.17-6.78 kbar, respectively. According to MORB and Chondrite-normalized diagrams, along with the geothermobarometer calculations, the most primitive amphibole is Type-3 amphibole and the last evolved amphibole is Type-2 amphibole. Oscillatory and inverse zonnig of the amphiboles in terms of Li, V, Cr, Ba, Gd, etc. indicate (repeated or not) magma recharging processes. From core to rim, increasing in the Li content of the minerals is the most important evidence for the crustal contamination effect on their formation. Amphibole trace element chemistry data and geothermobarometer calculations indicate that there are 3 different types of amphiboles in the Karacadağ andesites, which crystallized at various depths of the crust from 25 km to 5 km depth, and the rocks were clearly exposed to magma replenishment and crustal contamination processes.Article Citation - WoS: 1TEPEKENT (KONYA-ORTA ANADOLU) YÖRESİNDEKİ VOLKANİK KAYALARIN PETROGRAFİSİ, JEOKİMYASI VE PETROLOJİSİ(Konya Teknik Univ, 2022) Eryigit, Busra; Kurt, Hüseyin; Asan, Kürşad; Gençoğlu Korkmaz, Gülin; Korkmaz, Gulin GencogluBu çalışmada, Tepekent yöresi (Konya-Orta Anadolu) yüzeyleyen Miyosen yaşlı riyolitik, dasitik ve bazaltik lav akıntıları ve bunların piroklastiklerinin petrografisi, mineralojisi, jeokimyası ve petrolojisi incelenmiştir. İncelenen kayalar Toplam alkali-silika (TAS) diyagramına göre yüksek potasyum içerikli bazaltik traki-andezit, dasit ve riyolit bileşiminde kayalardır. Bununla birlikte incelenen bazaltik traki-andezitler Na2O-K2O içeriklerine göre şoşonit olarak da adlandırılmaktadır. Dasitik kayalar yer yer mm’den dm’ye değişen boyutta anklav içermektedir. Anklavlar TAS diyagramında traki-bazalt alanına düşmekte olup ana kayalarından daha mafik bir bileşim sergilemektedir. Bazaltik traki-andezitler holokristalin porfirik doku gösterirken, dasitler değişen volkanik cam içerikleri ile hipokristalin porfirik doku sergilemektedir. Bazaltik traki-andezitler olivin, klinopiroksen, plajiyoklaz ve Fe-Ti oksit içermekte, nadiren zeolitleşme ve olivinlerde iddingsitleşmeler göstermektedir. Dasitler amfibol, biyotit, plajiyoklaz, Fe-Ti oksit ve nadiren de kuvars mikro fenokristallerinin içerisine dağıldığı, aynı minerallerin mikrokristallerine ilaveten volkanik camdan oluşan hamur içeriğine sahiptir. Dasitik ana kayalarda yer alan anklavlar ana mafik mineral olarak amfibol içermekte olup, magma mixing anklavlarında sık sık rastlanan ince taneli dokuya sahiptir, bununla birlikte, bıçaksı biyotit, söndürülmüş amfibol ve elek dokulu plajiyoklaz gibi dokusal özellikler sergilemektedir. Riyolitler ise kuvars, plajiyoklaz ve Fe-Ti oksit mikrofenokristalinin yanı sıra önemli derecede sanidin ve biyotit içermektedir. Bununla birlikte dasitlere göre daha fazla volkanik cam içeriğine sahip olup, hipohiyalin porfirik doku sergilemektedir. İncelenen kayaların Okyanus Ortası Sırtı Bazaltları’na (OOSB) göre normalize iz element diyagramında, büyük iyon yarıçaplı litofil element bileşiminde (BİYE, Sr, K, Rb, U ve Th) bir zenginleşme izlenirken, yüksek alan enerjili elemente (YAEE, Nb, Ta, Ti) bileşiminde ise bir fakirleşme görülmektedir. Kondrite göre normalize nadir toprak element dağılımları, (La/Lu)N genel olarak 14-15 arasında değişim göstermektedir ve amfibol fraksiyolaşmasını anlatan kaşık desenli bir dağılım sunmaktadır. Riyolitlerde ise plajiyoklaz fraksiyonlaşmasını ifade eden belirgin biçimde negatif Eu anomalisi ve sanidin fraksiyonlaşmasına işaret eden önemli derecede negatif Ba anomalisi gözlemlenmektedir. Elde edilen veriler ışığında, incelenen volkanik kayaların yitim izi taşıyan çarpışma sonrası bimodal volkanizmanın ürünleri olduğu ve zenginleşmiş litosferik mantodan türemiş oldukları önerilmektedir.
Research Topics
Domains
Physical Sciences
Fields
Earth and Planetary SciencesComputer ScienceEngineering
Subfields
GeophysicsArtificial IntelligenceMechanics of Materials
Specific Research Areas
Geological and Geochemical Analysis
earthquake and tectonic studies
Geochemistry and Geologic Mapping
High-pressure geophysics and materials
Hydrocarbon exploration and reservoir analysis
Sustainable Development Goals
11SUSTAINABLE CITIES AND COMMUNITIES
6
Research Products
12RESPONSIBLE CONSUMPTION AND PRODUCTION
5
Research Products
15LIFE ON LAND
3
Research Products
8DECENT WORK AND ECONOMIC GROWTH
2
Research Products
13CLIMATE ACTION
1
Research Products
7AFFORDABLE AND CLEAN ENERGY
1
Research Products
17PARTNERSHIPS FOR THE GOALS
1
Research Products
Documents
9
Citations
38
h-index
3
Documents
12
Citations
48
Publication Collaboration
| Affiliation Name | Count |
|---|---|
| Konya Technical University | 16 |
| Heidelberg University | 4 |
| Queen's University | 3 |
| Curtin University | 3 |
| Geological Survey of Norway | 2 |
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Data obtained from OpenAlex
| Journal | Count |
|---|---|
| Journal of Geosciences | 2 |
| Konya mühendislik bilimleri dergisi (Online) | 2 |
| Journal of International Environmental Application and Science | 2 |
| Gazi University Journal of Science Part A: Engineering and Innovation | 1 |
| Geoheritage | 1 |
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Scholarly Output
42
Articles
19
Views / Downloads
86/229
Supervised MSc Theses
0
Supervised PhD Theses
1
WoS Citation Count
28
Scopus Citation Count
17
Patents
0
Projects
1
WoS Citations per Publication
0.67
Scopus Citations per Publication
0.40
Open Access Source
29
Supervised Theses
1
Scopus Quartile Distribution
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