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Articles 1621 - 1650 of 10319
Full-Text Articles in Physical Sciences and Mathematics
The Multidisciplinary Approaches On Facies Developments And Depositional Systems Of The Bahçecik Travertines, Gümüşhane, Ne-Turkey, Rai̇f Kandemi̇r, Ezher Tagli̇asacchi̇, Mi̇ne Sezgül Kayseri̇ Özer, Di̇lek Şaffak, Fati̇h Köroğlu, Hsun-Ming Hu, Chuan-Chou Shen
The Multidisciplinary Approaches On Facies Developments And Depositional Systems Of The Bahçecik Travertines, Gümüşhane, Ne-Turkey, Rai̇f Kandemi̇r, Ezher Tagli̇asacchi̇, Mi̇ne Sezgül Kayseri̇ Özer, Di̇lek Şaffak, Fati̇h Köroğlu, Hsun-Ming Hu, Chuan-Chou Shen
Turkish Journal of Earth Sciences
The Bahçecik travertines, located in Gümüşhane (NE-Turkey) have been investigated for the first time using a multidisciplinary approach, which included sedimentological (lithofacies, depositional system), petrographic, radiometric 230Th dating, geochemical analysis (stable isotopes), palynomorphs and geophysics (GPR). A carbonate build-up, 12 m thick, was formed with some interruptions, through the middle Pleistocene period. For this study, two travertine sections (F and D) were extensively used to figure out palaeoenvironmental and palaeoclimatic proxies. The main precipitation cycles, separated by palaeosol levels, have been described and interpreted from a sedimentological perspective. The carbonate deposits consist of shrubs, crystalline crust, reed, laminated (micritic), pisoids, …
Reassessment Of The Age And Depositional Environment Of The Kırkgeçit Formation Based On Larger Benthic Foraminifera, Nw Elazığ, Eastern Turkey, Sibel Kayğili
Turkish Journal of Earth Sciences
The middle-upper Eocene Kırkgeçit Formation, the fossil content of which is the subject of this study, is deposited in a back-arc basin controlled by block-faulting. The Kırkgeçit basin is interpreted as being formed under an extensional regime related to convergence between the Anatolian plate in the north and the Arabian plate in the south. The aim of this study is to reassess the age and depositional environment of the Kırkgeçit Formation by using detailed biometric analysis data obtained from the reticulate Nummulites and determinations of other larger benthic foraminifera (LBF) in the unit. For this purpose, two sections were measured …
Finite Volume Modeling Of Bathymetry And Fault-Controlled Fluid Circulation In The Sea Of Marmara, Eli̇f Şen, Doğa Doğan
Finite Volume Modeling Of Bathymetry And Fault-Controlled Fluid Circulation In The Sea Of Marmara, Eli̇f Şen, Doğa Doğan
Turkish Journal of Earth Sciences
Fluid vents in the Sea of Marmara were discovered and investigated by several studies. In this paper, a numerical model is created for the first time to determine the possible transport mechanism behind those fluid emissions at the seafloor. The finite volume method is used for numerical simulations by implementing a commercial finite volume code, ANSYS-Fluent. The thermal and physical rock properties used in our models are taken from previous studies. Bathymetry, fault-controlled fluid flow velocities, and temperature distribution patterns for the Central Basin and Western High in the Sea of Marmara are simulated and presented. Effects of faults, thickness …
Simulation Of Seismic Triggering And Failure Time Perturbations Associated With The 30 October 2020 Samos Earthquake (Mw 7.0), Eyüp Sopaci, Ati̇lla Arda Özacar
Simulation Of Seismic Triggering And Failure Time Perturbations Associated With The 30 October 2020 Samos Earthquake (Mw 7.0), Eyüp Sopaci, Ati̇lla Arda Özacar
Turkish Journal of Earth Sciences
The 30 October 2020 Samos earthquake (Mw = 7.0) ruptured a north-dipping offshore normal fault north of the Samos Island with an extensional mechanism. Aftershocks mainly occurred at the western and eastern ends of the rupture plane in agreement with the Coulomb static stress changes. Mechanism of aftershocks located west of the rupture supported activation of the neighboring strike-slip fault almost instantly. In addition, a seismic cluster including events with Mw~4 has emerged two days later at the SE side of Samos Island. This off-plane cluster displays a clear example of delayed seismic triggering at nearby active faults. In this …
Combined Qualitative And Quantitative Regional Interpretation Of The Thermal Results Of Magnetic Data In The Eastern Mediterranean Region, İlki̇n Özsöz
Turkish Journal of Earth Sciences
The study presents thermal structure and active-passive tectonic parts of the Eastern Mediterranean Region. Curie point depth, heat flow map, Moho depth and sediment thickness are used for interpretation. The levelled magnetic data that obtained from the World Digital Magnetic Anomaly Map (WDMAM) is used. The magnetic anomaly is divided into 39 zones for Curie point depth estimation. The Curie point depth values are calculated into Fourier domain. Then heat flow map is generated. The estimated Curie point depth values are ranging from 4.5 km to 25 km. Furthermore, heat flow values are between 55 mW/m2 and 277 mW/m2. Moho …
Structural Characteristics Of Transtensional Fault System And Its Implication Forhydrocarbon Accumulation In S Block, South Asia Area, Yuwen Dong, Iftikhar Satti, Maman Hermana, Xu Chen
Structural Characteristics Of Transtensional Fault System And Its Implication Forhydrocarbon Accumulation In S Block, South Asia Area, Yuwen Dong, Iftikhar Satti, Maman Hermana, Xu Chen
Turkish Journal of Earth Sciences
Transtensional faults are well developed in the S Block of the South Asia area, which have an important impact on the hydrocarbon accumulation. However, the transtensional fault structure is very complex. Based on drilling and seismic data interpretation results, faults are divided into three typical types in the Lower Cretaceous, which can help to understand the complex fault system. The main faults are distributed in the NNW-SSE direction and parallel arrangement with dextral strike-slip shear characteristics, which determines the development of the tectonic belt. The secondary faults are often associated with the main faults, often composed of multiple branch faults. …
Generation Of Collision-Induced Early To Middle Miocene Adakitic Magmas In Pertek(Tunceli) Area From Eastern Anatolia Postsubductional Setting, Turkey, Sevcan Kürüm, Hakan Çoban, Pinar Aydin
Generation Of Collision-Induced Early To Middle Miocene Adakitic Magmas In Pertek(Tunceli) Area From Eastern Anatolia Postsubductional Setting, Turkey, Sevcan Kürüm, Hakan Çoban, Pinar Aydin
Turkish Journal of Earth Sciences
Early to Middle Miocene andesite-dacite porphyries are well exposed to the Pertek area of Tunceli, Eastern Anatolia, and represent an example of adakite-like magma generation in Eastern Anatolia (postsubductional) collisional setting. Mineral associations in these porphyries are composed of plagioclase (oligoclase-andesine-labradorite), amphibole (pargasite-ferropargasite), biotite, rare quartz, K-feldspar, and minor Fe-Ti oxides. Geochemically they are high-K calc-alkaline in nature and characterized by high SiO2 (>62 wt.%), Al2O3 (mostly >16 wt.%), Na2O/K2O ratio (1.3-1.7), and Sr (generally >400 ppm) contents. Volcanic rocks display depletion in HFSEs, Nb, Ta, and Ti, and slight negative Eu anomaly; have low HREEs, Y (
Tectonic Evolution Of The Central Part Of The East Anatolian Fault Zone, Eastern Turkey, Eli̇f Akgün, Murat İnceöz
Tectonic Evolution Of The Central Part Of The East Anatolian Fault Zone, Eastern Turkey, Eli̇f Akgün, Murat İnceöz
Turkish Journal of Earth Sciences
The Eastern Anatolian Fault Zone (EAFZ), having a prominent place in the tectonic evolution of the Eastern Mediterranean, is a structural element of tectonic indentor due to the convergence between the African-Arabian plates and the Eurasian Plate. This study investigates the central part of EAFZ between Doğanyol (Malatya) and Çelikhan (Adıyaman). The geometry of the fault and the morphotectonic structures were determined by the field studies. Moreover, fault-slip data are measured according to the fault planes along the deformation zone for paleostress analysis. The paleostress analysis revealed three deformation phases that developed from the Late Eocene to the present due …
Source Modelling And Stress Transfer Scenarios Of The October 30, 2020 Samos Earthquake: Seismotectonic Implications, Sotiris Sboras, Ilias Lazos, Stylianos Bitharis, Christos Pikridas, Dimitrios Galanakis, Aristeidis Fotiou, Alexandros Chatzipetros, Spyros Pavlides
Source Modelling And Stress Transfer Scenarios Of The October 30, 2020 Samos Earthquake: Seismotectonic Implications, Sotiris Sboras, Ilias Lazos, Stylianos Bitharis, Christos Pikridas, Dimitrios Galanakis, Aristeidis Fotiou, Alexandros Chatzipetros, Spyros Pavlides
Turkish Journal of Earth Sciences
On October 30, 2020, a strong earthquake (Mw6.6-7.0) occurred offshore, just north of Samos Island, causing life losses, injuries and damages, especially on the Turkish side. The broader area is characterized by a complex geodynamic setting with both rich seismic history and numerous active faults of different direction and kinematics. The first aim of this study is to define the seismic source of the mainshock, based on seismological and geodetic data (GPS measurements and originally processed GNSS records), as well as our field observations on Samos Island few days after the mainshock. The integration of this information leads to a …
Gps Derived Finite Source Mechanism Of The 30 October 2020 Samos Earthquake, Mw =6.9, In The Aegean Extensional Region, Bahadir Aktuğ, İbrahi̇m Ti̇ryaki̇oğlu, Hasan Sözbi̇li̇r, Haluk Özener, Çağlar Özkaymak, Cemal Özer Yi̇ği̇t, Hali̇l İbrahi̇m Solak, Eda Esma Eyübagi̇l, Bengi̇su Geli̇n, Orhan Tatar, Mustafa Softa
Gps Derived Finite Source Mechanism Of The 30 October 2020 Samos Earthquake, Mw =6.9, In The Aegean Extensional Region, Bahadir Aktuğ, İbrahi̇m Ti̇ryaki̇oğlu, Hasan Sözbi̇li̇r, Haluk Özener, Çağlar Özkaymak, Cemal Özer Yi̇ği̇t, Hali̇l İbrahi̇m Solak, Eda Esma Eyübagi̇l, Bengi̇su Geli̇n, Orhan Tatar, Mustafa Softa
Turkish Journal of Earth Sciences
A submarine area close to the Turkish and Greek border between the cities of Samos-Greece and Seferihisar-Turkey has been shaked on October 30, 2020 by a Mw= 6.9 earthquake. In this study, the finite source mechanism of the Samos earthquake was investigated using geodetic methods and the coseismic behavior of the earthquake was modeled. The observed coseismic displacements at 62 sites were inverted for the fault geometry and the slips. The mainshock did not generate an on-land surface rupture. However, the uniform slip modeling shows a finite source of 43.1 km long and 16 km wide rupture, which slips 1.42 …
Seismic A And B-Values And Crustal Parameters Of Samos Island-Aegean Sea, Lesvosisland-Karaburun, Kos Island-Gökova Bay Earthquakes, Oya Pamukçu, Fi̇kret Doğru, Ayça Çirmik, Düzgün Göneş
Seismic A And B-Values And Crustal Parameters Of Samos Island-Aegean Sea, Lesvosisland-Karaburun, Kos Island-Gökova Bay Earthquakes, Oya Pamukçu, Fi̇kret Doğru, Ayça Çirmik, Düzgün Göneş
Turkish Journal of Earth Sciences
In recent years, seismicity has increased considerably in the Aegean Sea region and there have been earthquakes in which people lost their lives. The major earthquakes, Kos Island-Gökova Bay (Mw = 6.6), Lesvos Island-Karaburun (İzmir) (Mw = 6.2) and Samos Island-Aegean Sea (Mw = 6.9) occurred in the Aegean Sea and affected Aegean region strongly. Within the scope of this study, the seismic b-value of these major earthquakes was calculated in order to perform earthquake statistical analysis. Seismic a and b-values within the first 24 h and 14 days after the mainshock determination of Kos Island-Gökova Bay, Lesvos Island-Karaburun (İzmir) …
Recent Earthquake Activity Of March 2021 In Northern Thessaly Unlocks New Scepticism On Faults, Spyros Pavlides, Sotiris Sboras
Recent Earthquake Activity Of March 2021 In Northern Thessaly Unlocks New Scepticism On Faults, Spyros Pavlides, Sotiris Sboras
Turkish Journal of Earth Sciences
This short opinion article presents and highlights new and old problems related to active geological faults, as seismic sources, after the experience of the last March 3 and 4, 2021 (Mw6.3 and Mw6.0, respectively) Tyrnavos-Elassona earthquakes in northern Thessaly, Greece. Although the active faults in the area are very well studied, demonstrating typical geomorphic features that intensely affect the morphological relief, it seems that the earthquakes were produced by unknown faults emerging in the mountainous area (alpine basement). Primary (?) coseismic ruptures, however, were also observed northwards along the Titarissios valley. A geological interpretation of the faulting mechanism is also …
Paleoseismic History Of The Manisa Fault Zone, Western Anatolia, İsmai̇l Duran, Hasan Sözbi̇li̇r, Semi̇h Eski̇, Mustafa Softa, Hüseyi̇n Uytun, Mehmet Yüksel, Mustafa Topaksu
Paleoseismic History Of The Manisa Fault Zone, Western Anatolia, İsmai̇l Duran, Hasan Sözbi̇li̇r, Semi̇h Eski̇, Mustafa Softa, Hüseyi̇n Uytun, Mehmet Yüksel, Mustafa Topaksu
Turkish Journal of Earth Sciences
The 45-km-long, E-W to NW-SE-striking Manisa Fault Zone, which constitutes the western section of the Gediz Graben, is characterized by a pure normal sense of motion with a minor strike-slip component. Even though there are numerous historical earthquakes have been listed in Western Anatolia Graben System, a few studies have been addressed on seismic sources of the earthquakes so far. According to existing literature, the western segment of the Manisa Fault Zone is well known characterized; however, the eastern segment of it has rarely been addressed. To decipher the Holocene seismotectonic behavior of the eastern segment of Manisa Fault Zone, …
Surface Heat Flow In Western Anatolia (Turkey) And Implications To The Thermal Structureof The Gediz Graben, Eli̇f Pazvantoğlu, Kami̇l Erkan, Müjgan Şalk, Bülent Oktay Akkoyunlu, Mete Tayanç
Surface Heat Flow In Western Anatolia (Turkey) And Implications To The Thermal Structureof The Gediz Graben, Eli̇f Pazvantoğlu, Kami̇l Erkan, Müjgan Şalk, Bülent Oktay Akkoyunlu, Mete Tayanç
Turkish Journal of Earth Sciences
Knowledge of heat flow density on the Earth's surface and subsurface temperature distribution is essential for the interpretation of several processes in the crust such as for the evaluation of the geothermal potential of a region. With this study, we investigate the conductive heat flow distribution in western Anatolia to understand the thermal state and its relationship to regional tectonics in the region. The new heat flow data are collected and combined with previously published data to obtain the new heat flow map of western Anatolia. Analysis of data sets after appropriate corrections yields a better picture of the regional …
High Heat Generating Granites Of Kestanbol: Future Enhanced Geothermal System (Egs)Province In Western Anatolia, Dornadula Chandrasekharam, Alper Baba
High Heat Generating Granites Of Kestanbol: Future Enhanced Geothermal System (Egs)Province In Western Anatolia, Dornadula Chandrasekharam, Alper Baba
Turkish Journal of Earth Sciences
Although the western Anatolian region is a foci for hydrothermal systems, this region has several high heat-generating granitic intrusive bodies that qualify to be candidates for enhanced geothermal systems (EGS). Considering the future energy requirement, carbon dioxide emissions reduction strategies, food, and water security issues, these granites appear to be the future clean energy source for the country. One such granite intrusive is located in the Kestanbol area in the western Anatolian region. The radioactive heat generation of this 28 Ma old granite varies from 5.25 to 10.38 μW/m3 with a heat flow of 92.47 to 128.61 mW/m 2. These …
Seismic Velocity Characterisation And Survey Design To Assess Co2 Injection Performanceat Kızıldere Geothermal Field, Mahmut Parlaktuna, Şevket Durucan, Burak Parlaktuna, Çağlar Sinayuç, Martijn T.G. Janssen, Erdi̇nç Şentürk, Eri̇nç Tonğiç, Öncü Demi̇rci̇oğlu, Flavio Poletto, Gualtiero Bohm, Cinzia Bellezza, Biancamaria Farina
Seismic Velocity Characterisation And Survey Design To Assess Co2 Injection Performanceat Kızıldere Geothermal Field, Mahmut Parlaktuna, Şevket Durucan, Burak Parlaktuna, Çağlar Sinayuç, Martijn T.G. Janssen, Erdi̇nç Şentürk, Eri̇nç Tonğiç, Öncü Demi̇rci̇oğlu, Flavio Poletto, Gualtiero Bohm, Cinzia Bellezza, Biancamaria Farina
Turkish Journal of Earth Sciences
The noncondensable gases in most geothermal resources include CO2 and smaller amounts of other gases. Currently, the worldwide geothermal power is a small sector within the energy industry, and CO2 emissions related to the utilisation of geothermal resources are consequently small. In some countries, however, such as Turkey and Iceland, geothermal energy production contributes significantly to their energy budget, and their CO2 emissions are relatively significant. SUCCEED is a targeted innovation and research project, which aims to investigate the reinjection of CO2 produced at geothermal power production sites and develop, test, and demonstrate at field scale innovative measurement, monitoring and …
Use Of Geothermal Resources In Konya Plain Project (Kop) Region For Tourism, Healthpurposes, Agricultural, Industrial And Distict Heating, Bariş Çarikci, Merve Sefa, Kevser Akmaz, Ayşe Kandemi̇r, Feza Şen, Hasan Hüseyi̇n Öztürk
Use Of Geothermal Resources In Konya Plain Project (Kop) Region For Tourism, Healthpurposes, Agricultural, Industrial And Distict Heating, Bariş Çarikci, Merve Sefa, Kevser Akmaz, Ayşe Kandemi̇r, Feza Şen, Hasan Hüseyi̇n Öztürk
Turkish Journal of Earth Sciences
This study has been prepared in accordance with the objectives of evaluating and developing geothermal resources in order to bring the geothermal resources in the Konya Plain Project (KOP) Region, which includes Aksaray, Kırşehir, Konya, Nevşehir, Niğde and Yozgat provinces, to the country?s economy with maximum capacity, and to develop proposals for investments to be made. The number of overnight stays and the number of tourists outside the region should be increased by utilizing alternative tourism opportunities in the region. Their use in terms of geothermal energy, tourism and health has an important investment and income potential for the region. …
Use Of Geothermal Fluid For Agricultural Irrigation: Preliminary Studies In Balçova-Narlıdere Geothermal Field (Turkey), Mehmet Kami̇l Meri̇ç, Yasemi̇n Senem Kukul Kurttaş, Emrah Özçakal, Neri̇man Tuba Barlas, Hakan Çakici, Yakubu Abdullahi̇ Jarma, Nalan Kabay, Alper Baba
Use Of Geothermal Fluid For Agricultural Irrigation: Preliminary Studies In Balçova-Narlıdere Geothermal Field (Turkey), Mehmet Kami̇l Meri̇ç, Yasemi̇n Senem Kukul Kurttaş, Emrah Özçakal, Neri̇man Tuba Barlas, Hakan Çakici, Yakubu Abdullahi̇ Jarma, Nalan Kabay, Alper Baba
Turkish Journal of Earth Sciences
Balçova-Narlıdere Geothermal Field (BNGF) hosts the largest geothermal district heating system of Turkey and several geothermal wells used for district heating and thermal tourism activities. This study assesses the use of BNGF geothermal fluid for agricultural activities. The spent geothermal brine was treated using nanofiltration and reverse osmosis membranes on a pilot-scale membrane test system. The qualities of the product were evaluated in terms of agricultural irrigation integrated with the implemented innovative wireless sensor network. It is important to use geothermal fluid, which is consists of valuable minerals, for irrigation. But when using geothermal fluid in irrigation, the chemical composition …
Lithium Extraction From Geothermal Waters; A Case Study Of Ömer-Gecek(Afyonkarahisar) Geothermal Area, Muhammed Fati̇h Can, Can Başaran, Ahmet Yildiz, Müfi̇t Demi̇rkapi
Lithium Extraction From Geothermal Waters; A Case Study Of Ömer-Gecek(Afyonkarahisar) Geothermal Area, Muhammed Fati̇h Can, Can Başaran, Ahmet Yildiz, Müfi̇t Demi̇rkapi
Turkish Journal of Earth Sciences
Lithium (Li) is the lightest metal, has unique physicochemical properties and is the main component of lithium-ion batteries. Rechargeable lithium-ion batteries play a very important role in maximizing the performance of electric devices and vehicles. It is predicted that the metal and mineral demand for lithium-ion batteries will increase 56 times by 2050. In order to meet the increasing demand, in addition to known methods, lithium recovery from geothermal waters has become a very popular research subject. There are abundant geothermal water resources in the world, especially in Turkey and in Afyonkarahisar. The aim of this study is to produce …
Exploration Of Geothermal Potential Using Integrated Fuzzy Logic And Analytic Hierarchyprocess (Ahp) In Ağrı, Eastern Turkey, Erhan Şener, Şehnaz Şener
Exploration Of Geothermal Potential Using Integrated Fuzzy Logic And Analytic Hierarchyprocess (Ahp) In Ağrı, Eastern Turkey, Erhan Şener, Şehnaz Şener
Turkish Journal of Earth Sciences
The demand for energy is increasing day by day worldwide due to population growth, industrialization and rising living standards. Geothermal energy, one of the alternative energy sources, is preferred in terms of providing environmentally friendly, quality and regular energy. Our country is rich in geothermal resource potential. However, there are still many unexplored geothermal resources. In this study, fuzzy-AHP method was used to determine the geothermal potential of Ağrı province. Five criteria such as geological formations, hot / mineral springs, lineaments, land surface temperature and hydrothermal alteration zones were evaluated to determine the having geothermal potential. The maps of lineament, …
Late Campanian Larger Benthic Foraminifera From The Zekeriyaköy Formation (İstanbul,Nw Turkey): Taxonomy, Stratigraphy, And Paleogeography, Mert Eren Erdem, Ercan Özcan, Ali̇ Osman Yücel, Aral I. Okay, Sadikcan Erbay, Si̇bel Kayğili, İsak Yilmaz
Late Campanian Larger Benthic Foraminifera From The Zekeriyaköy Formation (İstanbul,Nw Turkey): Taxonomy, Stratigraphy, And Paleogeography, Mert Eren Erdem, Ercan Özcan, Ali̇ Osman Yücel, Aral I. Okay, Sadikcan Erbay, Si̇bel Kayğili, İsak Yilmaz
Turkish Journal of Earth Sciences
North of İstanbul, the thick Upper Cretaceous volcanic and volcanoclastic sequence of the Yemişliçay Group is nonconformably overlain by the neritic clastic and carbonate sequence of the Zekeriyaköy Formation. This unit, either placed within the volcanic sequence or interpreted to overlie it, was studied near Zekeriyaköy for its larger foraminifera, previously recurrently referred to as the Maastrichtian. The basal epiclastic sandstone beds of the Zekeriyaköy Formation immediately above the volcanic sequence contain Praesiderolites dordoniensis and rare rudist shells. The higher sandstone and limestone beds comprise assemblages of Lepidorbitoides campaniensis, Orbitoides megaloformis, Vanderbeekia catalana, Siderolites gr. calcitrapoides, Sirtina orbitoidiformis, Praestorrsella roestae, …
Hydrogeochemical Fingerprints Of A Mixohaline Wetland In The Mediterranean: Güllük Coastal Wetland Systems- Gcws (Muğla, Turkey), Adi̇le Meli̇s Somay Altaş
Hydrogeochemical Fingerprints Of A Mixohaline Wetland In The Mediterranean: Güllük Coastal Wetland Systems- Gcws (Muğla, Turkey), Adi̇le Meli̇s Somay Altaş
Turkish Journal of Earth Sciences
The Güllük coastal wetland system (GCWS), which is located at the contact point of the Menderes Massif and Lycian Nappe, consists of both brackish karstic [Güllük Lagoon wetland (GLW)] and saline [Boğaziçi-Tuzla (Bargylia) coastal wetland (BTW)] ecosystems in western Turkey, and is under protection as a national wetland of importance. This area is important for its unique wetland features, aquaculture, tourism, agriculture, Bodrum airport, and Güllük port facilities. The aim of this study was to evaluate the GLW and BTW, both hydrogeologically and hydrogeochemically, for the first time together. The mixohaline GCWS is recharged from precipitation, streams, and brackish karstic …
Time Frame For Future Large Earthquakes Near İstanbul Based On East-To-West Deceleratingfailure Of The North Anatolian Fault, Fati̇h Bulut, Asli Doğru
Time Frame For Future Large Earthquakes Near İstanbul Based On East-To-West Deceleratingfailure Of The North Anatolian Fault, Fati̇h Bulut, Asli Doğru
Turkish Journal of Earth Sciences
Large earthquakes that have occurred along the North Anatolian Fault (NAF) were analysed to elaborate the time frame of future large earthquakes near İstanbul. The historical earthquake catalog that was compiled covered 1 nearly complete and 2 fully complete failures of the NAF between 1250 and 2000 AD. These data were used to investigate the space-time systematics of M ≥ 7.0 earthquakes. The catalogue identified an east-to-west decelerating domino-like failure of the NAF. The deceleration starts around the western tip of the 1944 Gerede rupture. This suggested that failure of the remaining unruptured ~250-km section in the west (İstanbul to …
Earthquake History Of The Yatağan Fault (Muğla, Sw Turkey): Implications For Regionalseismic Hazard Assessment And Paleoseismology In Extensional Provinces, Mehran Basmenji, Hüsnü Serdar Akyüz, Erdem Kirkan, Murat Ersen Aksoy, Gülsen Uçarkuş, Nuretti̇n Yakupoğlu
Earthquake History Of The Yatağan Fault (Muğla, Sw Turkey): Implications For Regionalseismic Hazard Assessment And Paleoseismology In Extensional Provinces, Mehran Basmenji, Hüsnü Serdar Akyüz, Erdem Kirkan, Murat Ersen Aksoy, Gülsen Uçarkuş, Nuretti̇n Yakupoğlu
Turkish Journal of Earth Sciences
The southern part of the Western Anatolia Extensional Province is governed by E-W-trending horst-graben systems and NW-SE-oriented active faults. The NW-striking Yatağan Fault is characterised by an almost pure normal sense of motion with a minor dextral strike slip component. Although the settlements within the area have been affected by several earthquake events since ancient times (~2000 BCE), the earthquake potential and history of the Yatağan Fault has remained unknown until a few years ago. Considering the growing dense population within the area, paleoseismology studies were conducted in order to illuminate the historical earthquake activity on the Yatağan Fault. Two …
Active Tectonic Stress Field Analysis In Nw Iran-Se Turkey Using Earthquake Focalmechanism Data, Ahad Nouri Mokhoori, Behnam Rahimi, Mohsen Moayyed
Active Tectonic Stress Field Analysis In Nw Iran-Se Turkey Using Earthquake Focalmechanism Data, Ahad Nouri Mokhoori, Behnam Rahimi, Mohsen Moayyed
Turkish Journal of Earth Sciences
NW Iran-SE Turkey is a tectonically active zone related to the Arabia-Eurasia convergence, but the active stress state in this zone has not yet been clearly studied. To improve the knowledge of present-day stress state in this region, optimum reduced stress tensor was analysed. For this, a large number of earthquake focal mechanisms (277) were collected. The analyses show most mechanisms exhibit strike-slip to thrust faulting. These data indicate that this region is dominated by an N158° maximum horizontal compressive stress (SHmax) belonging to a transpressional tectonic regime. In the scale of the study area, the relative magnitude of the …
Mineralogical And Gemmological Characteristics Of Garnets Associated With Xenoliths Within Trachyte Dome, Hisarlıkaya (Ankara), Central Anatolia, Turkey, Eli̇f Varol Muratçay, Si̇bel Tatar Erkül, Güllü Deni̇z Külahci
Mineralogical And Gemmological Characteristics Of Garnets Associated With Xenoliths Within Trachyte Dome, Hisarlıkaya (Ankara), Central Anatolia, Turkey, Eli̇f Varol Muratçay, Si̇bel Tatar Erkül, Güllü Deni̇z Külahci
Turkish Journal of Earth Sciences
Garnet-bearing xenoliths are observed within a trachytic dome extrusion in the Hisarlıkaya region (Ankara). These garnets exhibiting greenish-reddish-dark brown colour and ranging in sizes up to 1 cm were examined in terms of mineralogical, geochemical, and gemmological characteristics. Mineralogical studies indicate that these garnets (And88-93 Grs7-12) are linked to solid solution series, which are dominantly andradite with lower content of grossular. According to major, trace, and rare earth element (REE) analysis, the representative garnet crystal shows high CaO, Fe2O3, Al2O3, MgO, MnO, V, W, and light rare earth elements (LREE) concentrations. These high concentrations might indicate the mobility of these …
Formation Age, Geochemical Characteristics And Petrogenesis Of Syenogranite In Chaihe Area, Central Daxingan Mountains: Constraints On Late Carboniferous Evolution Of The Xing'an And Songnen Blocks, Dongxue Li, Changqing Zheng, Chenyue Liang, Xiao Zhou
Formation Age, Geochemical Characteristics And Petrogenesis Of Syenogranite In Chaihe Area, Central Daxingan Mountains: Constraints On Late Carboniferous Evolution Of The Xing'an And Songnen Blocks, Dongxue Li, Changqing Zheng, Chenyue Liang, Xiao Zhou
Turkish Journal of Earth Sciences
The tectonic evolutionary history between the Xing'an Block (XB) and Songnen Block (SB) in the eastern Central Asia Orogenic Belt (CAOB) has been hotly debated. In this study, we present a series of new data to provide a better constraint on the magmatic process during plate subduction and its implications for the regional tectonic evolution of XB and SB, even the CAOB. The whole-rock geochemistry and zircon U-Pb chronology of syenogranite in the Chaihe area of the Great Xing'an Range have been carried out. The dating results show that the syenogranite was formed in the Late Carboniferous during the 303.1-316.1 …
High-Resolution Temperature And Precipitation Variability Of Southwest Anatolia Since 1730 Ce From Lake Gölcük Sedimentary Records, Iliya Bauchi Danladi, Sena Akçer Ön, Zeki̇ Bora Ön, Sabine Schmidt
High-Resolution Temperature And Precipitation Variability Of Southwest Anatolia Since 1730 Ce From Lake Gölcük Sedimentary Records, Iliya Bauchi Danladi, Sena Akçer Ön, Zeki̇ Bora Ön, Sabine Schmidt
Turkish Journal of Earth Sciences
We report high-resolution multiproxy analyses [lithology, μXRF and magnetic susceptibility (MS)] of two short gravity sediment cores from the crater Lake Gölcük, southwest Turkey. Our results provide a detailed hydroclimatic record for the last ~290 years. Aided with factor analysis of μXRF data and 210210Pb and 137Cs dating, our multiproxy data show that the Lake Gölcük records documented a series of wet and dry periods between ~ 1730 (±71) and ~ 2018 (±3) CE. Wet periods are evidenced by dark olive green mixed lithology (sandy, clay, and silts) and high values in MS and log(Sr/Ca). On the other hand, dry …
A Holocene Paleomagnetic Record From Küçükçekmece Lagoon, Nw Turkey, Özlem Makaroğlu
A Holocene Paleomagnetic Record From Küçükçekmece Lagoon, Nw Turkey, Özlem Makaroğlu
Turkish Journal of Earth Sciences
Lake sediments are very useful for providing high-resolution records of geomagnetic field variations, especially for the Holocene period. We present high-resolution paleomagnetic records from three cores (KCL12P1, P2, and P3) recovered from Küçükçekmece Lagoon, located at the northern shoreline of the Sea of Marmara, Turkey. The cores were subjected to a comprehensive paleomagnetic and rock magnetic investigation using oriented samples. According to the age-depth model, based on radiocarbon dating and X-ray fluorescence-derived Ca/Ti element ratios, tuned to available oxygen isotope records based on an absolute calendar-year time-scale, we obtained a new paleomagnetic record for the last 3800 years. Low paleointensities …
Geology, Mineralogy, And Geochemistry Of The Zarloukh Bentonite -Tuff Deposit,Hemrin South Mountain, Northern Iraq: Implications For Genesis And Geotectonics, Yawooz Kettanah
Turkish Journal of Earth Sciences
The Quaternary Zarloukh Bentonite -Tuff (ZBT) deposit occurs within the Hemrin South Mountain, northern Iraq. The ZBT deposit occurs as depression-filling exposed on the erosional surface of the siliciclastic Pliocene Muqdadiya Formation and covered by an overburden of recent sediments. The thickness of the studied industrial bentonite bed is ~80-100 cm, occurring at the bottom of these depressions, covered by ~3-4 m thick bedded volcanic tuff, which also contains many 10-12 cm thick bentonite layers along its bedding planes. The volcanic ash at the bottom of lakes/swamps with shallow water content acted as basins for the deposition of falling volcanic …