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Öğe Age determination for segments of the North Anatolian Fault (NAF) northern branch by 234U/230Th dating of Soğucak (Yalova) range-front travertines, south Marmara, Turkey(Elsevier Ltd, 2016) Selim, H. Haluk; Yavuz, Orhan; Gürer, Ö.Feyzi; Karakaş, Ahmet; Taş, K. ÖmerThe Soğucak travertine occurrences developed along north segment of the North Anatolian Fault (NAF) in Yalova province, Marmara Region, Turkey. The range-front type travertines outcropping over an approximately 1 km2 area with 20–40 m thickness are middle-thick bedded and back-tilted southward or horizontally. Lithology of the travertines includes physolite, stalactites-stalagmites, cave pearls, sharp pebble carbonate nodules, spherical-roller-intricate shapes and laminated banded travertines. Geochemical analysis was performed on six samples of the travertines. The samples showed high calcite composition (averagely 98%) and Mg carbonite content varying from 0.87 to 1.33%. The travertines were deposited by means of normal faults as indicated by structural and morphological relationship with active tectonics. 234U/230Th dating of the travertines provided an age range from 61.318 (±3.091) to 231.944 (±141.902) ka. Findings show that the travertine deposition and deployment of faults in the region occurred approximately at 231 ka, corresponding to Middle Pleistocene. Therefore, the age of both travertines and NAF was determined as Middle Pleistocene. © 2016 Elsevier Ltd and INQUAÖğe Arhavi-Hopa (Artvin) civarında oluşan doğal afetlerin nedenleri ve gayrimenkul sektöründeki yansımaları(İstanbul Ticaret Üniversitesi, 2019) Selim, H. Haluk; Uzuner, MuhammetArhavi ve Hopa (Artvin)’da en fazla karşılaşılan doğal afetler sel, kaya düşmesi, toprak kayması, moloz akması ve heyelan felaketleridir. Özellikle aşırı yağışların etkisiyle karşılaşılan taşkınların sebep olduğu zararlar sonrasında hem çevre hem de insanlar olumsuz etkilenmektedir. Doğal afetlere sebep olan etkenler meteorolojik, jeomorfolojik ve insan faktörleri şeklinde üçe ayrılır. Son yıllarda yeni afet yönetimi anlayışıyla afet risklerinin önceden belirlenmesi ve zararlarının azaltılması çalışmalarına daha da önem verilmiştir. Bu amaçla risk yönetimi ve faktörleri, azaltma, hazır olma, müdahale ve iyileştirme şeklinde adlandırılan yaklaşımlar ile afetler ele alınmalı ve yerel yönetimlerin doğal afete karşı hazırlıksız olan yapılarının iyileştirilmesi ve sürdürülebilir bir hale gelmesi gerekmektedir. Bu çalışmada, doğal afetlerin muhtemel etkileri ve bunlara sebep olan muhtemel tehlikeler ele alınmıştır. Daha sonra afet yönetimi ve risk yönetiminin temel yaklaşımlarından bahsedilerek özellikle sel, toprak kayması ve heyelanlar sonucunda maddi ve manevi zararların etkileri üzerinde durulmak ve gayrimenkul sektöründeki olumsuzluklar tartışılmaktadır. Bu anlamda, kentsel ölçekte olası önlemler ele alınacak ve bölgede oluşabilecek doğal afetlere karşı yapılması gereken kentsel dönüşüm ve yenileme çalışmaları hakkında çözüm yolları önerilmektedir.Öğe The Bursa-Gonen Depression, NW Turkey: a complex basin developed on the North Anatolian Fault(Cambridge Univ Press, 2013) Selim, H. Haluk; Tüysüz, OkanIn this study, we show that the southern branch of the North Anatolian Fault has been active since Late Pliocene time and that evidence of activity is supported by geological and seismological data. The southern branch of the North Anatolian Fault consists of four segments from west to east: Yenice-Gonen, Manyas-Mustafakemalpasa, Uluabat and Bursa. These faults delimit the Bursa-Gonen Depression, with the Bandirma-Mudanya Uplift to the north and Uludag-Sularya Uplift to the south. The Bursa-Gonen Depression includes Upper Pliocene to Recent sediments that thicken to the south, suggesting a deposition pattern under active fault control. Study of fault kinematics suggests that the Bursa-Gonen Depression started as a small pull-apart basin during Late Pliocene time, and then evolved to a large depression. The faults delimiting this depression are still active and capable of producing future earthquakes.Öğe Crustal compensation rate in central anatolian region and comparison of seismic activity(European Association of Geoscientists and Engineers, EAGE, 2017) Oruç, Bülent; Sönmez, Tuba; Ulutaş, Ergin; Selim, H. Haluk; Doğan, Mustafa BerkayThe crustal compensation rate can be estimated from the differences gravimetric Moho and isostatic Moho with respect to gravimetric Moho, and allow the establishment of the relationship between isostatic compensation and seismicity in the central Anatolian region. The compensation rates range between 92% and 108%. What is surprising about the most of events are aligned in the zones that encompass seismic activity with the rates between 99% and 101% that are almost fully compensated. It is understood that the pattern of seismicity is also dependence of rheological structure of crustal blocks. The areas where compansation rate less than 100% and greater than 100% correspond to undercompensation and overcompensation, respectively. The results in undercompensation provide aseismic zones where preseismic locking is high and a major role for accommodating the stress evaluation of crustal blocks, and may then be related to preseismic activity. The crustal thickening obtained from gravity inversion in the eastern part of the central Anatolian region suggests overcompensated crust and the buoyant forces that result from subsidence, controlled by the density contrast between crust and lithospheric mantle. The overcompensation areas are almost aseismic, and indicates isostatic readjustment. © 2017 European Association of Geoscientists and Engineers EAGE. All Rights Reserved.Öğe Environmental changes based on multi-proxy analysis of core sediments in Lake Aktas, Turkey: Preliminary results(Pergamon-Elsevier Science LTD, 2018) Kılıç, Nurgül Karlıoğlu; Caner, Hülya; Erginal, Ahmet Evren; Ersin, Sinem; Selim, H. Haluk; Kaya, HakanA sediment core covering the last millennium from Lake Aktas, a shallow alkaline soda lake in the northeast Anatolian highland of Turkey, was studied for pollen and physical and chemical proxies to reconstruct past climate change. The sediments were dated by AMS radiocarbon dating of bulk organic carbon. Among arboreal pollen (AP) from around 930 years ago, dominant trees were Pinus sylvestris, Picea orientalis, Abies, Betula, Fagus, and Quercus. AP exceeded NAP (non-arboreal pollen) in this time, whereas the opposite is the case in a pollen trap in the same region collecting the pollen for one year in 2015-2016. The comparison of modern and fossil pollen influx indicates that in that period trees were more widely distributed around the lake than today, where steppe vegetation now prevails. Inferred causes for the disappearance of trees are anthropogenic impacts and climatic change towards more continental conditions. The results also identify the onset of the Little Ice Age in the NE Anatolian highland of Turkey. (C) 2018 Elsevier Ltd and INQUA. All rights reserved.Öğe Eolianite and coquinite as evidence of MIS 6 and 5, NW Black Sea coast, Turkey(Elsevier B.V., 2017) Erginal, Ahmet Evren; Karabıyıkoğlu, Mustafa; Selim, H. HalukThis paper discusses the implications of a lowstand carbonate eolianite and overlying transgressive sequence of coquinite at Şile on the Turkish Black Sea coast based on composition, depositional characteristics and optical age estimations. The cross-bedded eolianite is a mixed ooid quartz grainstone in composition, yielding a depositional age matching MIS 6. It formed at the backshore of the paleobeach with the supply of sediment the from the beach face and offering insights into the drift of mixed shallow marine carbonates and siliciclastics together with radial ooids by onshore winds from a subaerially exposed high- to low-energy ooid shoals and oolitic sand complexes which developed parallel to the shoreline on the shallow shelf margin. During this lowstand, a low-relief dune retaining a record of opposing paleowind directions than that of prevalent northeasterly winds of today appears to have been lithified to form dune rock (aeolinite) under drier conditions compared to the present. Coinciding with MIS 5e, shallow marine coquina beds resting unconformably on the eolianite indicate the occurrence of the Mediterranean transgression during the last interglacial, as confirmed by benthic foraminifera within the high-salinity tolerant coquina shells. © 2017 Elsevier B.V.Öğe Investigation of engineering properties for usability of Lefke stone (Osmaneli/Bilecik) as building stone(Springer Verlag, 2019) Selim, H. Haluk; Karakaş, Ahmet; Coruk, ÖzkanLefke stone is a sandstone that has been widely used in mosques, madrasas, churches, and houses as building stone. The geological features and engineering properties of Lefke stone outcropped in the southern part of Osmaneli/Bilecik were investigated in field and laboratory studies. Samples acquired during the fieldwork were tested to determine the physical, mechanical, durability, and hygrothermal properties in the laboratory. The mean physico-mechanical properties of Lefke stone yielded apparent density of 2.38 g/cm3, specific gravity of 2.68 g/cm3, total porosity of 11.26%, 2.93% water absorption by weight, uniaxial compressive strength of 94 MPa, flexure strength of 11.45 MPa, a 3.90 MPa point load strength, 4.5–5 Mohs hardness, and field Schmidt hammer rebound value of 36. According to durability tests, Lefke stone is resistant to CaCl2 salt mist but has low resistance to SO2 aging. Salt crystals placed in the discontinuities of the rock caused slight crack growth. The stone’s resistance to crystallization of sodium sulphate salt is low, and an increase in the volume of salts crystallized in the rock results in low corner strengths. A capillary water-absorption value of 0.0016 kg/m2.h places Lefke stone into the category of very low water absorption capacity and permeability. The water vapor diffusion resistance factor (?) less than 1 indicates that the sandstone has high breathability. Its performance in historical buildings, field observations, and values obtained through laboratory tests confirm that Lefke sandstone can be used as a building stone. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.Öğe Kentsel dönüşüm uygulama modeli üzerine bir örnek tartışma (Kabakoz Mevki, Körfez/Kocaeli)(İstanbul Ticaret Üniversitesi, 2021) Sontay, Emre; Selim, H. HalukÜlkemizde ve dünya genelinde insanların kent merkezleri kabul edilen bölgelere sosyokültürel, eğitim ve ekonomik seviyelerini yükseltmek amacı ile yaptığı plansız göçler sonucu oluşan çarpık yapılaşma, kent için zamanla aşılamayacak bir sorun haline gelmektedir. Fenni şartlara uygun olarak hayata geçirilmemiş ve gelişi güzel yapılaşma neticesinde yaşanılan doğal afetler, can ve mal kayıpları oluşturmaktadır. Çarpık yapılaşmanın bitirilmesi ve sonucunda yaşanılabilecek maddi, manevi kayıpları da ortadan kaldırmak amacı ile devlet politikaları geliştirilmiş, kentsel dönüşüm uygulama aşamalarında denetim mekanizmaları arttırılmıştır. Bu sayede kentsel dönüşüm uygulamaları daha resmi bir zeminde oluşturulmakta ve dünya genelinde uygulanabilirliği yaygınlaşmaktadır. Bu çalışmada kentsel dönüşüm görüşünden yola çıkılarak, dönüşüm adına çıkartılmış belediye ve bakanlık resmi kararları da incelenerek, Kocaeli ili, Körfez ilçesindeki Kabakoz Mevki için kentsel dönüşüm uygulama modeli üzerine irdeleme ve uygulama sonucu elde edilecek kamu ve vatandaş yararı incelenmektedir.Öğe Mineralogical, petrological, and geochemical characteristics of Şenkaya Chrysoprase, Turkey(TUBITAK, 2022) Selim, H. Haluk; Güçtekin, Aykut; Şahin, Ferhan; Kaya, Mustafa; Tanç Kaya, Beril; Güner, Elanur; Taş, K. Ömer; Karakaş, Ahmet; Kantarçeken, YaseminŞenkaya chrysoprase is a gemstone and can be found near the Turnalı village located in the west-northwest of Şenkaya (Erzurum) county in the uplifted Kırdağ of Northeast Anatolia of Turkey. Chrysoprase only found in Şenkaya County and known with the same name commercially in Turkey is a light-dark green and cryptocrystalline structure gemstone encountered in the Örükyayla Mélange. Samples were collected from the field for defining mineralogical-petrographical, XRD, XRF, ICP-MS, optical cathodoluminescence microscopy (OCLM), FTIR-Raman and stable isotopic properties of Şenkaya chrysoprase. According to mineralogical and petrographic examination, Şenkaya chrysoprase has generally heterogeneous color distribution in macroscale and has 5 Mohs mineral hardness. Microquartz filling (10%–15%) was seen in the microexamination with serpentine as main component with partly massive opal type silica. The XRF analyses indicate that many samples had high SiO2 values (91.45–94.38 wt%). As a result of trace elements, rare earth elements, Au-Pt group analyses using ICP-MS, Ni (167–387 ppm) and Co (12.57–74.78 ppm) values are quite remarkable. In the OCLM studies, few metallic minerals which could produce CL and could spread CL in different colors due to some trace activator elements were observed. Oxygen isotopic (?18OV-SMOW ) values obtained from three chrysoprase samples are 24.8‰, 27.7‰ and 30.63‰, respectively and mean formation temperature is 96–99oC.Öğe Morphotectonic evidence from the southern branch of the North Anatolian Fault (NAF) and basins of the south Marmara sub-region, NW Turkey(2013) Selim, H. Haluk; Tüysüz, Okan; Karakaş, Ahmet; Taş, K.Ö.This study investigated the morphotectonic evidence from the southern branch of the North Anatolian Fault (NAF) and the south Marmara sub-region, NW Turkey. The south Marmara sub-region has two uplifts located in the south and north, and a depression between these uplifts. The uplifts are bounded by the southern branch of the NAF. The southern branch is divided into the Yenice-Gönen (YGFZ), Manyas-Mustafakemalpaşa (MMF), Uluabat (UFZ) and Bursa (BFZ) faults. The relation between the active tectonics and recent morphology were evaluated by using the geomorphic indices (GIs) (AF: asymmetry factor, T: topographic symmetry factor, SL: river length-gradient index, Smf: mountain-front sinuosity). GIs were used to define the effects of tectonism on morphology and were used to calculate the relative tectonic activity index (Iat). The values obtained through the GIs indicate a young tectonism in the study area. The study area morphometrically presented two Iat classes; class 1 (high relative tectonic activity) and class 2 (moderate relative tectonic activity). The present GPS data and Iat classes of the southern branch faults of the NAFZ were correlated. All of the calculations and field data reveal that the southern branch of the NAF is the main tectonic element forming the geomorphology of the south Marmara sub-region. © 2012 Elsevier Ltd and INQUA.Öğe Mücevherat sektöründe kullanılan iş sağlığı ve güvenliği risk analiz yöntemlerinden l tipi matris yöntemi(İstanbul Ticaret Üniversitesi, 2018) Selim, H. Haluk; Sekçuk SuatBu çalışmada, mücevherat sektöründe kullanılan risk analiz yöntemleri hakkında bilgi verilmiştir. Risk analiz yöntemlerinden L tipi matris yöntemi seçilerek bir uygulama yapılmıştır. Bu çalışma, ülkemizin mücevher sektöründe risk analiz yöntemleri ile birlikte iş kazalarının önlemeyi veya en az hasarla atlatabilmeyi hedeflemektedir. Dünya mücevherat sektörü rakamları hakkında bilgi verilmiştir. Bu çalışma ile mücevherat sektöründeki atölye çalışanlarının, çalışma ortamlarındaki tehlikelere karşı bilinçlenmelerini sağlamak hedeflenmiştir. Atölye çalışanlarından, önlemlerin hazırlanması sırasında alınan bilgilerin öneminden bahsedilmiştir. Yapılması gereken uygulamalar iş sağlığı ve güvenliği çerçevesinde literatür destekli incelenmiştir.Öğe MULTI-PROXY SEDIMENTARY RECORDS OF DRY-WET CLIMATE CYCLES DURING THE LAST 2 KA FROM LAKE CILDIR, EAST ANATOLIAN PLATEAU, TURKEY(Comitato Glaciologico Italiano, 2019) Erginal, Ahmet Evren; Cağatay, M. Namık; Selim, H. Haluk; Karabıyıkoğlu, Mustafa; Çakır, Cağlar; Yakupoğlu, Nurettin; Kaya, HakanMulti-proxy analyses together with AMS radiocarbon dating of sedimentary organic carbon of a sediment core from Lake Cildir, NE Turkey was carried out to study temporal changes in climate over the last two millennia. The lake is characterized by very fine to coarse silt-sized, carbonate-free sediments deposited at a relatively low sedimentation rate of less than 0.31 mm/yr. Results from element geochemistry, total organic carbon (C-org), and physical properties (gamma density and magnetic susceptibility results testified the occurrence of alternating cycles of drier and wetter climatic periods since about 2.2 ka cal BP. The period from 2166 +/- 112 cal BP to the onset of Little Ice Age, including the Medieval Climatic Anomaly, is represented by alternation of warm and wet conditions with intervening relatively low-magnitude dry periods. The cold Little Ice Age period, on the other hand, was dry, with upward decreasing trends of Zr and Ti and C-org as well as relatively low values of Rb/Sr, indicating decreasing chemical weathering intensity in the drainage basin and low organic productivity in the lake.Öğe Rheological stratification and spatial variations in the effective elastic thickness of the lithosphere underneath the central Anatolian region, Turkey(Elsevier Ltd, 2019) Oruç, Bülent; Ulutaş, Ergin; Pamukçu, Oya; Selim, H. Haluk; Sönmez, TubaIn this study, the regional components of global model EGM08 Bouguer anomalies obtained by low pass filtering were inverted to map the geometries of Moho and Lithosphere-Asthenosphere Boundary (LAB) of the central Anatolian region. It was determined the Moho and LAB depths in the region to be 35.8–41.2 km and 67–91 km, respectively. The results from rheological modeling indicate mechanical decoupling of the crust and uppermost lithospheric mantle in eastern part and coupling in the western part of the study area. We also compare the rheological stratification with the focal depth distribution of earthquakes to examine the possible discrepancies between the brittle-ductile transition zone and the maximum depths of earthquakes along the selected profiles. The spatial variations of effective elastic thicknesses (EET) of the lithosphere have been estimated from the strength of the crust and lithospheric mantle by implying deformation gradient at Moho and LAB. The EET values vary in the range of 19–24.3 km. Although the EET values are relatively high in the eastern part of the region, lower EET values are directly underlain by thinned lithosphere of northwestern and southwestern part of central Anatolian region. We also analyze the crustal rheologies obtained from the lithospheric strength by delineating the pattern of crustal seismic activities. © 2019 Elsevier LtdÖğe Structural interpretation of the Erzurum Basin, eastern Turkey, using curvature gravity gradient tensor and gravity inversion of basement relief(2013) Oruç, Bülent; Sertçelik, İbrahim; Kafadar, Özkan; Selim, H. HalukThe Erzurum Basin has received more attention in petroleum potential research because of its particularity in geographic and tectonic position. There remains debate on the basement structure of the basin since igneous rocks and faults make the structure and stratigraphy more complicated. We utilize gravity data to understand the structure of the Erzurum Basin. This study describes an edge enhancement technique based on the eigenvalues and determinant obtained from the curvature gravity gradient tensor (CGGT). The main goal of this technique is to delineate structural boundaries in complex geology and tectonic environment using CGGT. The results obtained from theoretical data, with and without Gaussian random noise, have been analyzed in determining the locations of the edges of the vertical-sided prism models. The zero contours of the smallest eigenvalue delineate the spatial location of the edges of the anomalous sources. In addition, 3-D gravity inversion of Bouguer anomalies has been used with purpose to estimate the structure of the substrata to allow modeling of the basement undulation in the Erzurum basin. For this reason, the Parker-Oldenburg algorithm helped to investigate this undulation and to evidence the main linear features. This algorithm reveals presence of basement depths between 3.45 and 9.06 km in the region bounded by NE-SW and E-W trending lineaments. We have also compared the smallest eigenvalue zero contours with the HGM images and Tilt derivative (TDR) of Bouguer anomaly map of the study area. All techniques have agreed closely in detecting the horizontal locations of geological features in the subsurface with good precision. © 2012 Elsevier B.V.Öğe Tarihi eserlerde doğal yapıtaşı olarak kullanılan Lefke taşının (Osmaneli/Bilecik) jeolojik ve mühendislik özellikleri(2019) Selim, H. Haluk; Karakaş, Ahmet; Coruk, ÖzkanLefke taşı bir kumtaşı çeşidi olup yapı taşı olarak İstanbul Haydarpaşa tren garı, Eskişehir Hükümet Konağı, Bebek ve Bostancı camileri ile Osmaneli ilçe merkezi ve civarında bulunan cami, medrese, kilise ve evlerde yaygın olarak kullanılmıştır. Fakat yapıtaşı olarak kullanılması açısından bilimsel olarak literatüre geçmiş bir çalışma mevcut değildir. Bu eksikliği gidermek ve Lefke taşının yapıtaşı özelliklerini belirlemek amacıyla jeolojik, fiziksel ve mekanik özelliklerin araştırıldığı bir çalışma yapılmıştır. Lefke taşının yapıtaşı olarak değerlendirilmesi amacıyla arazi ve laboratuvar çalışmaları gerçekleştirilmiştir. Arazi çalışmaları ile Lefke taşının jeolojik özellikleri ve laboratuvar çalışmaları ile fiziksel ve mekanik özellikleri belirlenmiştir. Arazi çalışmaları mostra başı çalışmalar ile numune alma işlemlerini kapsarken, laboratuvar çalışmaları ise Lefke taşının fiziksel ve mekanik özelliklerini belirlemek amacıyla standartlara (TSE, ASTM) uygun olarak ilgili deneylerin yapılmasını kapsamıştır. Arazi gözlemleri ve laboratuvar deneylerinden elde edilen fiziksel ve mekanik özelliklere ait değerler yardımıyla Lefke kumtaşının yapıtaşı olarak kullanılabilirliği değerlendirilmiştir.Öğe Tectonics of the buried Kirklareli Fault, Thrace Region, NW Turkey(2013) Selim, H. HalukThe study investigated the geometry, seismicity and kinematics of the Kirklareli Fault (KF) by using drilling, seismic reflection and field data. The KF, located in the Thrace Region, NW Turkey, is a buried fault that forms a morphological boundary between the Strandzha Mountains and the Ergene Basin. It has lithological and morphological importance in the region. Although there were some destructive earthquakes in the basin historically, the magnitude of the largest earthquake measured instrumentally was only 4.6. Earthquake data obtained from the Kandilli Observatory and Earthquake Research Institute indicate that the epicentres are concentrated along the KF. Deep borehole data show a total vertical displacement of 223m over the last 2Ma. Displacement calculations indicated that the KF moves with a normal displacement of at least 0.1mm/year. The seismic profile verified the existence of the KF. Kinematic analysis of measurements on bedding planes of a formation near the KF demonstrates N105° direction. The activeness and existence of the hangingwall and footwall of the KF are discussed on the basis of morphometric analyses and geomorphic indices. The two geomorphic indices (SL and Vf) show that tectonism effects the morphology. The KF has normal fault geometry according to drilling, seismological and GPS data, geomorphic indices and field observations. © 2013 Elsevier Ltd and INQUA.Öğe Türkiye’deki yarı değerli taşların satış stratejilerinin geliştirilmesi(İstanbul Ticaret Üniversitesi, 2020) Toka, Mehmet Resul; Selim, H. HalukTürkiye’de yarı değerli taş potansiyeli oldukça fazla olmasına rağmen, özellikle işletmelerde ve ülke genelinde yaşanılan pazarlama sorunu, bu konudaki avantajımızı kaybetmemize neden olmaktadır. Ürünlerin tasarımlarının güncelliğini kaybetmesi, satış öncesi ve sonrası sunulan hizmetlerin yetersizliği ve tanıtım konusunda yeterli olmayan yöntemlerin tercih edilmesi satışa etki eden faktörlerdendir. Özellikle, sektörde hala geleneksel üretim tekniklerinin kullanılması ve altyapısı sağlam olmayan satış yöntemleri ile firmaların uluslararası alanda rekabet edilebilirlik düzeyi zayıflamaktadır. Bu durumda sektörün ekonomiye katkısı azalmaktadır. Bunların giderilmesi için ürünlerde satış stratejilerinin uygulanarak geliştirilmesi gerekmektedir. Yarı değerli taşların satışı ve pazarlanması konusunda yeni yaklaşım ve stratejiler takip edilmeli ve belirlenmelidir. Bu kapsamda, uygulanacak olan stratejilerle taşların satışı artırılacak ve çağdaş stratejilerin uygulanması ile sektörde önemli gelişmeler sağlanacaktır.
