Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Kaygusuz, Abdullah(15)
- Kurt, Kemal(14)
- Sipahi, Ferkan(14)
- Yücel, Cem(9)
- Arslan, Mehmet(8)
- Akar, Bülent(7)
- Gücer, Mehmet Ali(6)
- Uzun, Sevda(6)
- Şahin, Bülent(6)
- Aslan, Zafer(5)
- Batan, Nevzat(5)
- Dokuz, Abdurrahman(5)
- Vural, Alaaddin(5)
- Erata, Hüseyin(4)
- Temizel, Irfan(4)
- Akpınar, İbrahim(3)
- Alataş, Mevlüt(3)
- Aydınçakır, Emre(3)
- Eyuboglu, Yener(3)
- Ezer, Tülay(3)
- Karsli, Orhan(3)
- Kulakaç, Nurşen(3)
- Sadiklar, M. Burhan(3)
- Saydam Eker, Çiğdem(3)
- Siebel, Wolfgang(3)
- Snegovaya, Nataly Yu.(3)
- Uysal, Ibrahim(3)
- Akpinar, A.(2)
- Akpinar, Adem(2)
- Aydinçakir, Emre(2)
- Barinova, Sophia(2)
- Bektas, Osman(2)
- Bilgic, Abdulbaki(2)
- Bostan, Sedat(2)
- Bölükbas, Mehmet(2)
- Chen, Bin(2)
- Coruh, Emine(2)
- Dervisoglu, Adalet(2)
- Dogan, Nilgun(2)
- Eker, Çiğdem Saydam(2)
Yayınlar
- MakaleYalnız künye2015Scopus SJRQ4The effects of the CSR isomorphism on both CSP and CFP
Ilhan-Nas, Tülay; Koparan, Emrah; Okan, Tarhan
Purpose – The purpose of this study is to contribute to the understanding of the interrelationships between corporate social responsibility (CSR) isomorphism of headquarters (HQs) and their subsidiaries as well as corporate social performance (CSP) and corporate financial performance (CFP) at the subsidiary level. Design/methodology/approach – This study tested these relationships through canonical correlation analyses. The data used were drawn from corporate HQ and 63 subsidiaries, which were publicly listed on the Istanbul Stock Exchange in 2007. Both qualitative and quantitative techniques were used in the study. Findings – The results generally indicated that the isomorphism between the CSR practices of the HQ and those of their subsidiaries could impact both the CSP, especially the product and employee dimensions, and the CFP. No relationship was found to exist between the CSP and CFP. Originality/value – Despite extensive interest by scholars and practitioners in the subject area, relatively little is known about the management of CSR by the multinational enterprises (MNEs) (Meyer, 2004), as the literature does not systematically examine the effects that occur on employee performance following the diffusion of CSR among the MNEs subsidiaries. Extending earlier literature on CSR, by integrating the effect of the CFP, the present study focuses on the effects of isomorphism between the CSR practices of the MNEs and those of their subsidiaries on both CSP and CFP. Further, the study examined the interrelation of CSP and CFP from the perspective of international management. Given the increased interest in corporate governance matters at the international level, CSR plays a central and fundamentally important role in the corporate governance of the MNEs because of both globalization forces and the pressures exerted by stakeholders. In this context, this paper is one of the first to explore the transfer of CSR practices from the MNEs to their subsidiaries. The effect of CSR on performance is an important research question, especially for emerging markets (Ibrahim and Angelidis, 1995; Waddock and Graves, 1997; Ghazali, 2007; Johnson and Greening, 1999). Despite the importance of this issue, however, until recently, only a limited discussion has been evident in the literature on CSR in the international arena with particular reference given to the emerging economies. Studying the effects of the CSR isomorphism on the performance in Turkish context is justified in three ways. First, Turkey is the largest emerging economy in Eastern Europe, the Balkans and the Middle East (Tatoglu et al., 2003, p. 7). It presents the emerging nature of the market and the transitional characteristics of the institutional environment (Cavusgil et al., 2002). Second, the drivers for CSR in Turkey, such as the other emerging markets whose institutional characteristics and economic fundamentals is similar, are exogenous and institutional rather than endogenous factors (Ararat and Gocenoglu, 2006, p. 11). Excluding the philanthropic activities, the very first manifestations of CSR were observed in the business conduct of MNEs in Turkey (Ararat and Gocenoglu, 2006, p. 11). MNEs have a dominant and leader role in Turkey for CSR practices. Finally, the subsidiaries operating in Turkey are less likely to resist the transfer of the organizational policies and practices such as human resource management policies (Sayim, 2010, 2011) and organizational culture (Ilhan, 2008). In fact, they want to even transfer the policies and practices from MNEs (Sayim 2010, 2011; Ilhan, 2008). Therefore, Turkish context provides a good case to test the effects of the CSR isomorphism on the performance.
AtıfScopus12WoS9OpenAlex16
İncele - MakaleYayıncıda açık erişim2014Scopus SJRQ4A New Empirical Relation between Surface Wave Magnitude and Rupture Length for Turkey Earthquakes
Öztürk, Serkan
Many practical problems encountered in quantitative oriented disciplines entail finding the best approximate solution to an over determined system of linear equations. In this study, it is investigated the usage of different regression methods as a theoretical, practical and correct estimation tool in order to obtain the best empirical relationship between surface wave magnitude and rupture length for Turkey earthquakes. For this purpose, a detailed comparison is made among four different regression norms: (1) Least Squares, (2) Least Sum of Absolute Deviations, (3) Total Least Squares or Orthogonal and, (4) Robust Regressions. In order to assess the quality of the fit in a linear regression and to select the best empirical relationship for data sets, the correlation coefficient as a quite simple and very practicable tool is used. A list of all earthquakes where the surface wave magnitude (Ms) and surface rupture length (L) are available is compiled. In order to estimate the empirical relationships between these parameters for Turkey earthquakes, loglinear fit is used and following equations are derived from different norms: Ms = 1.02* LogL + 5.18, for L-2 Norm regression (R-2=0.71), Ms = 1.15* LogL + 4.98, for L-1 Norm regression (R-2=0.92), Ms = 1.04* LogL + 5.15, for Robust regression (R-2=0.75), Ms = 1.25* LogL + 4.86, for Orthogonal regression (R-2=0.68), Consequently, the empirical equation given by the Least Sum of Absolute Deviations regression as Ms = 1.15* LogL + 4.98 with a strong correlation coefficient (R-2=0.92) can be thought as more suitable and more reliable for Turkey earthquakes. Also, local differences in rupture length for a given magnitude can be interpreted in terms of local variation in geologic and seismic efficiencies. Furthermore, this result suggests that seismic efficiency in a region is dependent on rupture length or magnitude.
AtıfWoS8İncele - MakaleAçık Erişim2014Scopus SJRQ2Updated checklist of harvestmen (Arachnida: Opiliones) in Turkey
Kurt, Kemal
In this work, faunistic studies on harvestmen from Turkey are reviewed. A total of 88 species and 7 subspecies from 35 genera belonging to 7 families were determined. The distribution in Turkey and the world of these taxa is given and their distribution in the geographical regions of Turkey are presented.
AtıfScopus27WoS26OpenAlex25İncele - MakaleYalnız künye2014Scopus SJRQ2Geochemical and Sr-Nd isotopic characteristics of Murgul (Artvin) volcanic rocks in the Eastern Black Sea Region (Northeast Turkey)
Sipahi, Ferkan; Sadiklar, M. Burhan; Şen, Cüneyt
The studied volcanic rocks are footwall and hanging wall dacites from the Murgul mine and the surrounding area. Moreover, the hanging wall dacites contain enclaves. Footwall dacite contains biotite, whereas hanging wall dacitic rocks contain hornblende as a ferromagnesian mineral. The enclaves in the hanging wall dacite have sizes that range from 1cm to 20cm and contain hornblende as a ferromagnesian mineral. The volcanic rocks show tholeiitic and transitional affinities. They are rich in large ion lithophile element and light rare earth element with pronounced depletion of high field strength elements. The chondrite-normalized rare earth element patterns (LaN/LuN=1.47-5.12) show low to medium enrichment, which reveal that the rocks were obtained from similar sources in Murgul volcanic rocks. The initial 87Sr/86Sr values range from 0.70442 to 0.70525, and the initial 143Nd/144Nd values range from 0.512741 to 0.512770. The main solidification processes involved in the evolution of the volcanic rocks consist of fractional crystallization with minor amounts of crustal contamination and magma mixing. All geochemical data support that these rocks originated from andesitic magma, and that the parental magma of the rocks were probably derived from an enriched upper mantle, previously modified by subduction-induced metasomatism in a geodynamic setting.
AtıfScopus28WoS26OpenAlex25İncele - MakaleYalnız künye2014Scopus SJRQ4Redescription of phalangium riedeli staręga, 1973 (Opiliones: Phalangiidae) from Turkey with the first description of the female
Kurt, Kemal
Phalangium riedeli Staręga, 1973, previously known only from the male in Syria, is redescribed on the basis of newly collected material from Turkey. The female of this species is described for the first time. Its description, characteristic features, distribution, measurements and photographs of genitalia and general habitus of both sexes are presented.
AtıfScopus3WoS3OpenAlex2İncele - MakaleAçık Erişim2014Scopus SJRQ3New record of the genus homolophus (Opiliones: Phalangiidae) in Turkey and sem studies on its morphology
Kurt, Kemal
In this study, Homolophus nakhichevanicus Snegovaya, 2012 (Opiliones: Phalangiidae) was recorded in Turkey for the first time. This is only the second known location for this species, the first being the type locality (Nakhichevan Autonomous Republic, Azerbaijan). The morphological characteristics are described along with a scannig electron microscope (SEM) study on the dorsal aspect, crown-shape on cephalothorax, ocularium, chelicera, pedipalp, the first pair of legs. The male genitalia of the specimens are also presented.
AtıfScopus3WoS2OpenAlex2İncele - MakaleYalnız künye2014Scopus SJRQ3Geochemistry of dacitic volcanics in the Eastern Pontides (NE Turkey)
Sipahi, Ferkan; Sadıklar, M.Burhan
Dacitic rocks that crop out around the Zigana Mountain (Gümüşhane) in the eastern Pontide (NE Turkey), are mainly composed of quartz, plagioclase, sanidine, amphibole, muscovite, and biotite as the main minerals. Zircon and rutile are the accessory minerals. Pyrite, chalcopyrite, and covellite are the opaque components. On the basis of trace-element data, dacites have been classified as Dacite-I and Dacite-II. Dacite-I is tholeitic-transitional, whereas Dacite-II is transitional-calc-alkaline. The geochemical variation can be explained by the fractionation of the common mineral phases, such as plagioclase, hornblende, magnetite, and apatite. Dacites also show island-arc properties, with negative Nb, Sr, P, and Ti anomalies. The trace-element distrubitions of the dacitic rocks reflect the typical characteristics of rocks from the subduction-related tectonic setting, with enrichment of large-ion lithofile elements and light rare-earth element, but depletion in high-field-strength elements. The dacitic rocks are developed through plagioclase ± hornblende-controlled fractionation from the same parental magma that settled in two successive stages and are derived from an enriched source, probably by the mixing of slab-derived and lithospheric melts.
AtıfScopus18WoS15İncele - MakaleYalnız künye2014Scopus SJRQ3New desmid records of Karagöl Lake in Karagöl-Sahara National Park (Şavşat-Artvin/Turkey); [Karagöl-Sahara Milli Parki{dotless}'ndaki (Şavşat-Artvin/Türkiye) karagöl'den yeni desmid kayi{dotless}tlari{dotless}]
Akar, Bülent; Şahin, Bülent
The benthic algal flora of Karagöl Lake (Şavşat, Artvin) was investigated between October 2008 and September 2010. Actinotaenium diplosporum var. americanum, Cosmarium pseudoexiguum, Gonatozygon kinahanii, Staurastrum boreale var. quadriradiatum, S. hantzschii and Staurodesmus dejectus var. apiculatus were recorded for the first time for the desmid flora of Turkey.
AtıfScopus13WoS12OpenAlex2İncele - MakaleAçık Erişim2014Scopus SJRQ4The relationship between capital flows and current deficit: Evidence from Turkey
Akbas, Yusuf Ekrem; Senturk, Mehmet; Sancar, Canon
The present paper analyzed the relationship between current account deficit and capital flows in Turkey over the period from 1990-2011. Augmented Dickey Fuller and Dickey Fuller-Generalized Least Squares unit root tests were used to analyze the stability of current deficit (CA) and capital flows (CF) series. Then, autoregressive distributed lag (ARDL) bound test was used in order to check if there is cointegration between the series according to the results obtained from the ARDL test. To conclude, the study revealed that is a cointegration relationship between current deficit and capital flows in Turkey.
- MakaleYalnız künye2013Scopus SJRQ4A new record of the genus paranemastoma redikorzev, 1936 (Opiliones: Nemastomatidae) from Turkey
Kurt, Kemal; Erman, Ömer Köksal; Snegovaya, Nataly Yu.
Paranemastoma kalischevskyi (Roewer, 1951) is recorded in Turkey for the first time. The morphological characteristic features, exact locality and general distribution are provided for this species.
AtıfScopus2WoS3OpenAlex2İncele - MakaleYalnız künye2013Scopus SJRQ1Post-collisional adakitic volcanism in the eastern part of the Sakarya Zone, Turkey: Evidence for slab and crustal melting
Dokuz, Abdurrahman; Uysal, Ibrahim; Siebel, Wolfgang; Turan, Mehmet; Duncan, Robert; Akçay, Miǧraç
New geochemical and isotopic data for post-collisional Early Eocene and Late Miocene adakitic rocks from the eastern part of the Sakarya Zone, Turkey, indicate that slab and lower crustal melting, respectively, played key roles in the petrogenesis of these rocks. The Early Eocene Yoncali{dotless}k dacite (54.4 Ma) exhibits high Sr/Y and La/Yb ratios, low Y and HREE concentrations, moderate Mg# (44-65), and relatively high εNd and low ISr values, similar to adakites formed by slab melting associated with subduction. Geochemical composition of the Yoncali{dotless}k dacite cannot be explained by simple crystal fractionation and/or crustal contamination of andesitic parent magma, but is consistent with the participation of different proportions of melts derived from subducted basalt and sediments. Sr/Y correlates horizontally with Rb/Y, and Pb/Nd correlates vertically with Nd isotopic composition, indicating that Sr and Pb budgets are strongly controlled by melt addition from the subducting slab, whereas positive correlations between Th/Nd and Pb/Nd, and Rb/Y and Nb/Y point to some contribution of sediment melt. In addition to low concentrations of heavy rare earth elements (~2-3 times chondrite), a systematic decrease in their concentrations and Nb/Ta ratios with increasing SiO2 contents suggests that slab partial melting occurred in the garnet stability field and that these elements were mobilized by fluid flux. These geochemical and isotopic signatures are best explained by slab breakoff and fusion shortly after the initiation of collision. Although the Late Micone Tavdaǧi{dotless} rhyolite (8.75 Ma) has some geochemical features identical to adakites, such as high Sr/Y and La/Yb ratios, low Y and HREE concentrations, other requirements, such as sodic andesite and/or dacite with relatively high MgO and Mg# (>50), relatively high Ni and Cr, low K2O/Na2O (<0.4), high Sr (>400 ppm), for slab-derived adakites are not provided. It is sodic in composition and shows no traces of fractionation from dacitic parent magma. Low Nd and high Sr isotope ratios suggest derivation by partial fusion of calc-alkaline, juvenile crust with high Sr/Y and La/Yb ratios.
AtıfScopus84WoS79OpenAlex76İncele - MakaleYalnız künye2013Scopus SJRQ1The contribution of hydropower in meeting electric energy needs: The case of Turkey
Akpinar, Adem
In this article, an attempt is made to better understand the contribution of hydropower in meeting electric energy needs of Turkey. Thus, a comparison between Turkey and other countries, which have some similarities with Turkey or which are more developed nations compared to Turkey, for evaluating from different aspects the contribution of hydropower in meeting electric energy needs is performed. The producers of electricity and hydroelectricity in the world, and the electric sectors of all the selected countries are firstly examined. Thereafter, Turkey's water resources and its potential, hydropower potential, and current status of hydropower in Turkey are investigated in detail. A detailed discussion regarding economic and energy indicators, hydroelectricity versus thermal electricity, the contributions of hydroelectricity to the total and renewable electricity generation, and the usage status of hydro potential of each selected nation is also made. Finally, it is found that hydropower is the second largest contributor in meeting Turkey's electric energy needs after thermal, mainly natural gas. It is also estimated that the contribution of hydropower will continue because a vast amount of its economically feasible hydro potential (about 64%) is undeveloped. Besides, it is determined that the contribution of hydropower in the total electricity generation in Turkey is greater than that of China and India, but it is lower than that of Norway, Brazil, and Canada.
AtıfScopus21WoS20OpenAlex27İncele - MakaleAçık Erişim2013Scopus SJRQ1Petrogenesis of the late Cretaceous Turnagöl intrusion in the eastern Pontides: Implications for magma genesis in the arc setting
Kaygusuz, Abdullah; Sipahi, Ferkan; Ilbeyli, Nurdane; Arslan, Mehmet; Chen, Bin; Aydinçakir, Emre
A series of Cretaceous plutons is present in the eastern Pontides of northeastern Turkey. The Turnagöl intrusion is the least studied and, thus, the least understood plutons in the orogen. This intrusion consists of hornblende-biotite granodiorites emplaced at 78 Ma based on LA-ICP-MS U-Pb zircon dating. It is of sub-alkaline affinity, belongs to the medium- to high-K calc-alkaline series, and displays features typical of I-type granites. The rocks of the intrusion are enriched in large-ion lithophile elements and light rare earth-elements with negative Eu anomalies (Eu/Eu* = 0.69-0.82), but are deficient in high-field-strength elements. They have a small range of ( 87Sr/86Sr)i (0.7060-0.7063), ÉNdi(-2.6 to -3.1), and δ18O (+8.1 to +9.1) values. Their Pb isotopic ratios are 206Pb/204Pb = 18.63-18.65, 207Pb/ 204Pb = 15.62-15.63, and 208Pb/204Pb = 38.53-38.55. The fractionation of plagioclase, hornblende, and Fe-Ti oxides had key functions in the evolution of the Turnagöl intrusion. The crystallization temperatures of the melts ranged from 758 to 885 C as determined by zircon and apatite saturation thermometry. All these characteristics, combined with the low values of K2O/Na2O and (Na 2O + K2O)/(FeOt + MgO + TiO2), as well as the high values of (CaO + FeOt + MgO + TiO2), suggest an origin by dehydration melting from a metabasaltic lower crustal source.
AtıfScopus54WoS49OpenAlex60İncele - MakaleYalnız künye2013Scopus SJRQ2Assessment of Radiological Levels at Schools in Trabzon, Turkey
Çevik, Ugur; Çelik, Ahmet; Çelik, Necati; Özkalayci, Fatih; Akbulut, Songul
In this study, a survey on environmental radioactivity in 16 high schools located in north eastern region of Turkey (the black sea region, province of Trabzon) was carried out. Indoor air radon (Rn-222) concentrations were measured in spring and autumn 2008 seasons using LR115 solid state nuclear track detectors and gamma radioactivity levels were measured using an HPGe gamma ray detector. It was seen that mean radon activity concentrations in schools ranged from 31 to 157 Bq/m(3) for spring season and from 38 to 114 Bq/m(3) for autumn season. The mean gamma activity concentrations in located areas of schools are between 18-52, 21-59, 11-97 and 265-759 Bq/kg for Ra-226, Th-232, Cs-137 and K-40, respectively. The annual effective doses of students and staff received due to radon and locations' gamma radioactivity levels are calculated.
AtıfScopus5WoS5OpenAlex8İncele - Derleme MakaleYalnız künye2012Scopus SJRQ1RETRACTED: Regional sustainable water and energy development projects: A case of Southeastern Anatolia Project (GAP) in Turkey (Retracted article. See vol. 83, pg. 173, 2018)
Akpinar, A.; Kaygusuz, K.
Southeastern Anatolia Project (GAP) region in Turkey is rich in water for irrigation and hydroelectric power. The Euphrates and Tigris Rivers represent over 28% of the nation's water supply by rivers, and the economically irrigable areas in the region make up 20% of those for the entry country. Turkey has a total gross hydropower potential of 433 GWh/yr, but only 125 GWh/yr of the total hydroelectric potential of Turkey can be economically used. By the construction of new hydropower plants, 36% of the economically usable potential of the country would be tapped. The GAP region has a 22% share of the country's total hydroelectric potential, with plans for 22 dams and 19 hydroelectric power plants. Once completed, 27 billion kWh of electricity will be generated annually. (C) 2011 Elsevier Ltd. All rights reserved.
AtıfWoS11OpenAlex15İncele - MakaleYalnız künye2012Scopus SJRQ1The total electricity energy production of the world, European Union, and Turkey: Projections and comparison
Akpinar, A.; Tavşan, F.; Kömürcü, Murat Ihsan; Filiz, M.H.; Kaygusuz, K.
This study aims to forecast the world's, European Union's (EU), and Turkey's electricity energy generation until 2030. For this purpose, the electricity energy sector of the world, EU, and Turkey was overviewed from past to present. The total electricity energy generation for the world, EU, and Turkey were then modelled by using historical energy generation data as years with regression analysis. Data from 1970 to 2004 for Turkey and data from 1980 to 2004 for the world and EU were used for the projections. Electricity energy productions have been forecasted up to year 2030. According to the results, it is determined that cubic (R2 = 0.997) and linear (R2 = 0.993) models for projection of the world's and EU's electricity energy generation, respectively, is fitness while the quadratic (R2 = 0.996) model fits for the projection of Turkey's total electricity energy generation and Turkey will have 0.995% of the world's electricity energy generation in 2030, while the EU will have 8.41% within the world's electricity energy generation in 2030 if the current trend continues.
AtıfScopus5WoS5OpenAlex8İncele - Derleme MakaleYalnız künye2012Scopus SJRQ1Hydropower for sustainable energy development in Turkey: The small hydropower case of the Eastern Black Sea Region
Capik, Mehmet; Osman Ylmaz, Ali; Cavusoglu, Ibrahim
Turkey is a rich country from the point of variety and potential of renewable energy resources. Hydros, winds, biomass, solar and geothermal are important renewable and environmentally friendly sources for energy in Turkey. Turkey produces large amount of hydropower with a total gross hydropower potential of 433 TW h/yr, which is equal to 13.8% of the total hydropower potential of Europe. Technically useable potential is 216 TW h/yr and economic potential is 140 TW h/yr. The main aim of the present study is to investigate hydropower potential of Turkey and small hydropower plants in Eastern Black Sea Region for sustainable energy development in Turkey. The geography of Turkey especially, Eastern Black Sea Region supports and suitable the development of the small hydro plants to increase the energy generation and utilization of available water sources in Turkey. Besides, the paper deals with hydropower policies to meet ever increasing energy demand for sustainable development of Turkey.
AtıfScopus51WoS43OpenAlex54İncele - MakaleAçık Erişim2012Scopus SJRQ2The first record of the species Lacinius erinaceus Staręga, 1966 (Opiliones, Phalangiidae) in Turkey with some SEM studies on its morphology
Kurt, K.; Erman, Ö.K.
The harvestman species of Lacinius erinaceus Stare{ogonek}ga 1966, recorded for the first time in Turkey, is presented in this paper. The characteristic features of this species are described and illustrated and data regarding collecting sites and distribution all over the world are given. Scanning electron microscopy (SEM) studies on the dorsal integument, dorsal habitus, chelicerae, pedipalpus, trident, the ocularium and legs of the specimens are also presented. Localities of the collecting sites are plotted on a map.
AtıfScopus7WoS7OpenAlex7İncele - MakaleYalnız künye2012Scopus SJRQ2Monte Carlo modelling of human body for dose conversion coefficients of 137Cs in soil of the Eastern Black Sea region of Turkey
Çelik, Necati
Absorbed dose conversion coefficients for a human body standing on the soil surface were calculated for 137Cs in the soil of Eastern Black Sea region of Turkey using the Monte Carlo simulation method. The results were given in nGy h -1 per Bq cm -2 as a function of depth. Simple numerical integration of this function multiplied with the known specific activity as a function of depth gives the absorbed dose conversion coefficients for any distribution of 137Cs in soil. Gaussian distribution of 137Cs in the soil was considered for calculations.
AtıfScopus1WoS1OpenAlex1
İncele - MakaleYalnız künye2012Scopus SJRQ1Geochronological evidence and tectonic significance of Carboniferous magmatism in the southwest Trabzon area, eastern Pontides, Turkey
Kaygusuz, Abdullah; Arslan, Mehmet; Siebel, Wolfgang; Sipahi, Ferkan; Ilbeyli, Nurdane
The northern and southern zones of the eastern Pontides (northeast Turkey) contain numerous plutons of varying ages and compositions. Geochemical and isotopic results on two Hercynian granitoid bodies located in the northern zone of the eastern Pontides allow a proper reconstruction of their origin for the first time. The intrusive rocks comprise four distinct bodies, two of which we investigated in detail. Based on LA-ICP-MS U-Pb zircon dating, the Derinoba and Kayadibi granites have similar 206Pb/ 238U versus 207Pb/ 235U Concordia ages of 311.1 2.0 and 317.2 3.5 million years for the former and 303.8 1.5 million years for the latter. Aluminium saturation index values of both granites are between 0.95 and 1.35, indicating dominant peraluminous melt compositions. Both intrusions have high SiO 2 (74-77 wt.%) contents and show high-K calc-alkaline and I-to S-type characteristics. Primitive mantle-normalized element diagrams display enrichment in K, Rb, Th, and U, and depletion in Ba, Nb, Ta, Sr, P, and Ti. Chondrite-normalized rare earth element patterns are characterized by concave-upward shapes and pronounced negative Eu anomalies with L acn/Y bcn=4.6-9.7 and E ucn/Eu*=0.11-0.59 (Derinoba), and L acn/Y bcn=2.7-5.5 and E ucn/Eu*=0.31-0.37 (Kayadibi). These features imply crystal-melt fractionation of plagioclase and K-feldspar without significant involvement of garnet. The Derinoba samples have initial Nd values between-6.1 and-7.1 with Nd model ages and T DM between 1.56 and 2.15 thousand million years. The Kayadibi samples show higher initial Nd (I) values,-4.5 to-6.2, with Nd model ages between 1.50 and 1.72 thousand million years. This study demonstrates that the Sr isotope ratios generally display negative correlation with Nd isotopes; Sr isotope ratios were lowered in some samples by hydrothermal interaction or alteration. Isotopic and petrological data suggest that both granites were produced by the partial melting of early Palaeozoic lower crustal rocks, with minor contribution from the mantle. Collectively, these rocks represent a late stage of Hercynian magmatism in the eastern Pontides.
AtıfScopus138WoS132OpenAlex138İncele