Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Uzun, Sevda(77)
- Merdan, Mehmet(73)
- Duran, Celal(54)
- Ozdes, Duygu(50)
- Baltaci, Cemalettin(45)
- Kaygusuz, Abdullah(45)
- Kulakaç, Nurşen(39)
- Ashyralyyev, Charyyar(38)
- Karsli, Orhan(37)
- Demir, Selim(36)
- Öztürk, Serkan(36)
- Dokuz, Abdurrahman(35)
- Turan, Ibrahim(35)
- Araz, Onur(33)
- Kandemir, Raif(31)
- Sipahi, Ferkan(30)
- Topal, Fevzi(30)
- Kurt, Kemal(28)
- Peker, Iskender(28)
- Arslan, Mehmet(27)
- Baltacı, Cemalettin(27)
- Maden, Nafiz(27)
- Ozturk, Samet(27)
- Aydin, Aydanur(26)
- Vural, Alaaddin(26)
- Bayrakdaroglu, Serdar(25)
- Kurnaz, Muammer(25)
- Reis, Hatice Catal(25)
- Akar, Zeynep(24)
- Aydin, Faruk(24)
- Gücer, Mehmet Ali(24)
- Topal, Meryem(24)
- Yolcu, Halil(24)
- Yücel, Cem(24)
- Anaç, Halil(23)
- Kankal, Murat(23)
- Ürkek, Bayram(23)
- Aliyazicioglu, Yuksel(22)
- Günen, Mehmet Akif(22)
- Tuncer, Metin(22)
Yayınlar
- MakaleAçık Erişim2012Scopus SJRQ3Synthesis and antimicrobial activity of new phthalocyanine complexes and electrochemical and spectroelectrochemical behaviour of cobaltphthalocyanine
Kaya, Elif Çelenk; Karadeniz, Hülya; Koca, Atif; Kahriman, Nuran; Sökmen, Atalay
A novel phthalocyanine bearing oxygen donor atoms on the peripheral positions has been synthesised by cyclotetramerisation of (E)-4-(4- cinnamoylphenoxy) phthalonitrile and its nickel, zinc, cobalt, copper and lead derivatives prepared. The thermal stabilities of the phthalocyanine compounds have been determined and their possible biological activities (antibacterial, anticandidal and antifungal) studied. The effects of substituent on the electrochemical and in situ spectroelectrochemical behaviour of cobaltphthalocyanine have been investigated and an in situ electrocolorimetric method was applied to investigate the colour of the electrogenerated anionic and cationic forms of the complex.
AtıfScopus5WoS4OpenAlex4
İncele - MakaleYalnız künye2012Scopus SJRQ3Phytochemical and antioxidant characteristics of medlar fruits (Mespilus germanica L.)
Ercisli, S.; Sengul, M.; Yildiz, H.; Sener, D.; Duralija, B.; Voca, S.; Dujmovic Purgar, D.
Eleven medlar {Mespilus germanica L.) genotypes sampled from Turkey were analyzed for their fruit weight, fruit dimensions, fruit firmness, ostiole diameter, shape index, skin color, moisture (%), ash (%), reducing sugar (%), crude protein (%), pH, soluble solid content (%), vitamin C (mg/100 g), minerals (P, K, Ca, Mg, Fe, Zn, Mn), total phenolic content and total antioxidant capacity. A wide variation among genotypes on most of the searched parameters was evident. Fruit weight varied from 11.21 g to 33.24 g indicating high variability among genotypes. Determination of antioxidant activities by β-carotene - linoleic acid and 2-diphenyl-l-picrylhydrazyl (DPPH) free radical scavenging assays resulted in average 80.8%, and 46.6 μg/ml FW DPPH, respectively. The total phenolic contents of eleven medlar genotypes varied from 114 to 293 mg gallic acid equivalent in 100 g fresh weight basis. The medlar fruits were found to be rich in terms of potassium, calcium, phosphorus, magnesium and iron.
AtıfScopus28WoS29İncele - MakaleYalnız künye2012Scopus SJRQ2Aflatoxin levels in raw and processed hazelnuts in Turkey
Baltaci, C.; Ilyasoǧlu, H.; Cavrar, S.
Aflatoxin levels in hazelnut samples obtained from exporter companies were monitored over a 3-year period. A total of 3188 samples of raw and processed hazelnuts were analysed using an HPLC method. The total aflatoxin content of the contaminated samples was in the range of 0.02-78.98 μg kg-1 for hazelnut kernels, 0.07-43.59 μg kg-1 for roasted hazelnut kernels, 0.02-39.17 μg kg-1 for roasted sliced hazelnut kernels, and 0.02-11.20 μg kg-1 for hazelnut purees, respectively, showing that the variations of aflatoxin contamination were very high. The results of aflatoxin analysis revealed that the aflatoxin contamination in the hazelnut samples was at a tolerable level. A total of 3147 samples were contaminated with aflatoxins, although below the legal limits. However, the aflatoxin contents of 41 samples exceeded the legal limits. Therefore, aflatoxin contents of hazelnuts should be monitored regularly to minimise the risk of aflatoxin hazard, and pre- and post-harvest strategies should be developed to prevent aflatoxin formation.
AtıfScopus32WoS24OpenAlex34
İncele - BildiriYalnız künye2012Fractional parabolic differential and difference equations with the Dirichlet-Neumann condition
Ashyralyev, Allaberen; Emirov, Nazar; Cakir, Zafer; Ashyralyev, A; Lukashov, A
The multidimensional fractional parabolic equation with the Dirichlet-Neumann condition is studied. Stability estimates for the solution of the initial-boundary value problem for this fractional parabolic equation are established. The stable difference schemes for this problem are presented. Stability estimates for the solution of the first order of accuracy difference scheme are obtained. A procedure of modified Gauss elimination method is applied for the solution of first and second order of accuracy difference schemes of one-dimensional fractional parabolic differential equations.
AtıfScopus2WoS1OpenAlex1İncele - MakaleYalnız künye2012Scopus SJRQ3Petrography and geochemistry of Eocene sandstones from eastern Pontides (NE TURKEY): Implications for source area weathering, provenance and tectonic setting
Eker, Cigdem Saydam
Subaerial weathering level, source area and tectonic environments were interpreted by using petrographic and geochemical characteristics of Eocene age sandstones found in the eastern Pontides. The thickness of Eocene age clastic rocks in the eastern Pontides ranges from 195 to 400 m. Mineralogical components of sandstones were mainly quartz, feldspar, rock fragments, and opaque and accessory minerals. Depending on their matrix and mineralogical content, Eocene age sandstones are identified as arkosic arenite-lithic arenite and feldspathic wacke-lithic wacke. CIA (Chemical Index of Alteration) values observed in the Eocene age sandstones (43-55) suggest that the source terrain of the sandstones was not affected by intense chemical weathering. Low CIW/CIA (Chemical Index of Weathering/Chemical Index of Alteration) values of the sandstones studied here suggest only slightly decomposed material and having undergone little transport until final deposition. Zr/Hf, Th/Sc, La/Sc and CIA ratios are low and demonstrate a mafic source; on the other hand, high LREE/HREE ratios and a slightly negative Eu anomaly indicate a subordinate fclsic source. Modal mineralogical and SiO 2/Al 2O 3 and K 2O/Na 2O and Th, Zr, Co, Sc of Eocene age sandstone contents indicate that they are probably magmatic arc originated and deposited in the back arc basin.
AtıfScopus22WoS23OpenAlex28İncele - MakaleYalnız künye2012Scopus SJRQ3Estimation of variance components and heritability of birth weight through different methods in Swedish Red and White cattle
Aksakal, V.; Bayram, B.; Yanar, M.; Akbulut, O.
Data on 368 birth records of Swedish Red and White cattle herd raised organically at Dogan Organic Dairy Cattle Farm for a period of 2006 and 2009 (4 years) were used to estimate the effects of different environmental factors on birth weight. Additionally, a comparison of four methods for variance component estimation to compute heritability of birth weight was performed using ML (Maximum likelihood), MINQUE (Minimum variance quadratic unbiased estimation), REML (Restricted maximum likelihood) and Henderson's Method III. Average abortion rate, stillbirth rate, twin and single birth rates of Swedish Red and White cattle were as 4.5%, 4.3%, 3.2% and 87.7% respectively. The least squares mean for birth weight was 37.4±0.70 kg. While effects of calving year (P<0.01), calving season (P<0.05) and sex of calve (P<0.01) were significant, and the effect of age of dam was not significant (P>0.05). Sire and error variance components and standard error of the heritability obtained by using ML method were lower than those obtained by the other three methods. Heritability estimates for birth weight obtained by ML, REML, MINQUE and Henderson Method III were 0.57±0.22, 0.62±0.24, 0.65±0.25 and 0.59±0.24, respectively. It is concluded that the ML procedure was superior for estimating variance components and heritability of birth weight of Swedish Red and White cattle and non-genetic factors influencing the birth weight should also be considered in selection and an adjustment for the significant environmental factors should be made.
AtıfScopus2WoS1İncele - BildiriYalnız künye2012Modeling of FLC-incremental based MPPT using DC-DC boost converter for standalone PV system
Cakmak, Recep; Altas, Ismail H.; Sharaf, Adel M.
This paper presents the modeling of a Fuzzy Logic Controller-Incremental (FLC-Inc.) based maximum power point tracking (MPPT) method and its comparison with traditional Perturb and Observation (P&O) method for standalone photovoltaic (PV) systems. The PV system, which is composed of PV panels, boost converter, MPPT unit and dc load, is modeled and digitally simulated in MATLAB/Simulink. The simulated results are illustrated to show the improvements obtained by the proposed FLC-Inc. based MPPT method.
AtıfScopus14OpenAlex16İncele - MakaleYalnız künye2012Scopus SJRQ1The effects of using learning objects in two different settings
Çakiroǧlu, Ünal; Baki, Adnan; Akkan, Yaşar
The study compared the effects of Learning Objects (LOs) within different applications; in classroom and inextracurricular activities. So in this study, firstly a Learning Object Repository (LOR) has been designed inparallel with 9th grade school mathematics curriculum. One of the two treatment groups was named as"classroom group" (n=24) used LOs with the guidance of the teacher during lessons in a computer lab, anothergroup named as "project group" (n=26) used LOs at home with the aim of preparing projects and assignments.Students in both groups used LOs during 11 weeks. A pre-test and post-test quasi-experimental design was used.Test results are compared in different learning domains (sets, numbers, relations and functions). In addition theinterviews with the teacher and the observations inside the class were taken into account for revealing thereasons about the change on academic achievements. The results of the study about students' academicachievements showed that; LOs use in classroom activities were more effective than LOs use in extracurricularactivities if sets, numbers, relations, functions and operations domains are considered together. Nevertheless thisstudy supported the idea of "LOs can be used in both in classroom activities and in extracurricular activities".
AtıfScopus4İncele - Derleme MakaleYalnız künye2012Scopus SJRQ1Present situation and potential role of renewable energy in Turkey
Çapik, Mehmet; Yilmaz, Ali Osman; Çavuşoĝlu, Ibrahim
Turkey has a rich potential of hydropower, wind and geothermal energy resources. The distribution of these renewable energy sources in operation are hydropower, wind and geothermal 14.802 MW 1002MW and 94 MW, respectively. Turkey possesses a huge hydroelectric resource which is one of the Turkey's major energy assets. Most of the important uses of water in power plants have been developed in the electricity generation. Turkey has a total gross hydropower potential of 433 TWh/yr, which is equal to 13.8% of the total hydropower potential of European. Technically useable and economic potential are 216 TWh/yr and 140 TWh/yr, respectively. The total share of all energy for electricity power generation in 2010 are coal, natural gas, fuel oil and renewable energy, 104,040 GWh, 125,549 GWh, 18,215 GWh, and 86,120 GWh respectively. Among the renewable energy resources in Turkey, biomass and solar energy are also important because their share in total energy consumptions have increased. On the other hand, Turkey has not utilized nuclear energy yet. The current government plans to have a nuclear power plant with a capacity of 1800MW at the Black Sea Port of Sinop. The main purpose of the energy policies is to answer the energy needs of increasing population and growing economy at minimum costs while making energy supply planning. Turkey's specific national energy strategy document and energy policy objectives are outlined in the institutional strategic plans. These strategic plans are energy supply security, regional and global influence in the area of energy and environment protection. The aim of energy policy including renewable are to develop existing energy sources and to avoid dependence on energy imports and to encourage private sector investment and to improve the reliability of electricity supply. The main aim this study will investigate at the present potential of energy resources and future contributions to the national energy consumption in Turkey. As result present energy situation, the renewable energy potential, and the energy politics of Turkey are investigated.
AtıfScopus64WoS58OpenAlex79İncele - BildiriYalnız künye2012Three-dimensional modeling of the sesamoid bones
Catal, Hatice; Corumluoglu, Ozsen
In this research, digital image processing techniques was used to create 3-dimensional (3D) virtual model of sesamoid bones. As study materials, Ballerina's and sedentary women's axial MDCT (Multidetector Computed Tomography) feet images were utilized. For the determination bone boundaries in each slides, image preprocessing and then segmentation steps were followed. All these processing steps was done in 3DDoctor software. All the measurements were obtained over the 3D model formed. Various statistical ratios were computed regarding the area, volume and length measurements. The comparison done in the study was performed by using these ratios for sedentary and ballerinas. As an outcome, some differences were found in sesamoid bones of ballerina and sedentary women.
- MakaleAçık Erişim2012Scopus SJRQ4Synthesis and characterization of new metallophthalocyanines bearing macrocyclic N 3O 2 groups on peripheral positions
Kaya, Elif Çelenk
The synthesis and characterization of new zinc(II) 3 , nickel(II) 4 and cobalt(II) 5 phthalocyanines complexes carrying macrocyclic N 3 O 2 groups on peripheral positions are described. The compounds were characterized by elemental analysis, IR, 1 H and 13 C NMR, UV-Vis and MS spectral data.
AtıfScopus1WoS1OpenAlex1İncele - MakaleYalnız künye2012Scopus SJRQ1Coexistence of abyssal and ultra-depleted SSZ type mantle peridotites in a Neo-Tethyan Ophiolite in SW Turkey: Constraints from mineral composition, whole-rock geochemistry (major-trace-REE-PGE), and Re-Os isotope systematics
Uysal, Ibrahim; Ersoy, E. Yalcin; Karsli, Orhan; Dilek, Yildirim; Sadiklar, M. Burhan; Ottley, Chris J.; Tiepolo, Massimo; Meisel, Thomas
We present new, whole-rock major and trace element chemistry, including rare earth elements (REE), platinum-group elements (PGE), and Re-Os isotope data from the upper mantle peridotites of a Cretaceous Neo-Tethyan ophiolite in the Mugla area in SW Turkey. We also report extensive mineral chemistry data for these peridotites in order to better constrain their petrogenesis and tectonic environment of formation. The Mugla peridotites consist mainly of cpx-harzburgite, depleted harzburgite, and dunite. Cpx-harzburgites are characterized by their higher average CaO (2.27 wt.%), Al2O3 (2.07 wt.%), REE (53 ppb), and Os-187/Os-188((i)) ratios varying between 0.12497 and 0.12858. They contain Al-rich pyroxene with lower Cr content of coexisting spinel (Cr# = 13-22). In contrast, the depleted harzburgites and dunites are characterized by their lower average CaO (0.58 wt.%), Al2O3 (0.42 wt.%), and REE (1.24 ppb) values. Their clinopyroxenes are Al-poor and coexist with high-Cr spinel (Cr# = 33-83). The Os-187/Os-188((i)) ratios are in the range of 0.12078-0.12588 and are more unradiogenic compared to those of the cpx-harzburgites. Mineral chemistry and whole rock trace and PGE data indicate that formation of the Mugla peridotites cannot be explained by a single stage melting event; at least two-stages of melting and refertilization processes are needed to explain their geochemical characteristics. Trace element compositions of the cpx-harzburgites can be modeled by up to similar to 10-16% closed-system dynamic melting of a primitive mantle source, whereas those of the depleted harzburgites and dunites can be reproduced by similar to 10-16% open-system melting of an already depleted (similar to 16%) mantle. These models indicate that the cpx-harzburgites are the products of first-stage melting and low-degrees of melt-rock interaction that occurred in a mid-ocean ridge (MOR) environment. However, the depleted harzburgites and dunites are the product of second-stage melting and related refertilization which took place in a supra subduction zone (SSZ) environment. The Re-Os isotope systematics of the Mugla peridotites gives model age clusters of similar to 250 Ma, similar to 400 Ma and similar to 750 Ma that may record major tectonic events associated with the geodynamic evolution of the Neo-Tethyan. Rheic, and Proto-Tethyan oceans, respectively. Furthermore, >1000 Ma model ages can be interpreted as a result of an ancient melting event before the Proto-Tethys evolution. (C) 2011 Elsevier B.V. All rights reserved.
AtıfScopus222WoS214OpenAlex219İncele - MakaleYalnız künye2012Scopus SJRQ1Combination of culture-dependent and culture-independent molecular methods for the determination of lactic microbiota in sucuk
Kesmen, Z.; Yetiman, A. E.; Gulluce, A.; Kacmaz, N.; Sagdic, O.; Cetin, B.; Adiguzel, A.; Sahin, F.; Yetim, H.
In this study, the culture-dependent and culture-independent molecular methods were used for the identification of lactic acid bacteria (LAB) in sucuk a Turkish fermented dry sausage. On the one hand, the PCR-DGGE method targetting the V1 and V3 regions of 16S DNA was applied to DNA that was directly extracted from sucuk samples. On the other hand, rep-PCR fingerprinting was performed for the primary differentiation and grouping of the isolates, and the results were confirmed by sequencing of the 165 rDNA and 16S-23S rDNA intergenic spacer region. As a result of the PCR-DGGE analysis of all the samples, total 8 different lactic acid bacteria were identified, and Lactobacillus sakei, Lactobacillus curvatus and Weissella viridescens were the dominant microbiota among these bacteria. The culture-dependent approach indicated that the majority of the strains belonged to the Lactobacillus genera including Lb. sakei, Lactobacillus plantarum, Lb. curvatus, Lactobacillus brevis, Lactobacillus farciminis and Lactobacillus alimentarius. However, Leuconostoc and Weisella were also detected as minor genera. Again, Lactococcus piscium, Weissella halotolerans, Staphylococcus succinus and the comigrated Staphylococcus piscifermentans/Staphylococcus condimenti/Staphylococcus camosus group were detected only with the culture-independent method while Lb. plantarum, Leuconostoc mesenteroides and Leuconostoc citreum were identified only by using the culture-dependent method. In the results, it was concluded that the combination of culture-dependent and culture-independent methods was necessary for reliable and detailed investigation of LAB communities in fermented food products. (C) 2011 Elsevier B.V. All rights reserved.
AtıfScopus56WoS44OpenAlex49İncele - MakaleAçık Erişim2012Scopus SJRQ2Numerical Simulation of Fractional Fornberg-Whitham Equation by Differential Transformation Method
Merdan, Mehmet; Gökdogan, Ahmet; Yildirim, Ahmet; Mohyud-Din, Syed Tauseef
An approximate analytical solution of fractional Fornberg-Whitham equation was obtained with the help of the two-dimensional differential transformation method (DTM). It is indicated that the solutions obtained by the two-dimensional DTM are reliable and present an effective method for strongly nonlinear partial equations. Exact solutions can also be obtained from the known forms of the series solutions.
AtıfScopus45WoS41OpenAlex43İncele - MakaleYalnız künye2012Scopus SJRQ1Adsorption of Phenol from Aqueous Solution on a Low-Cost Activated Carbon Produced from Tea Industry Waste: Equilibrium, Kinetic, and Thermodynamic Study
Gundogdu, Ali; Duran, Celal; Senturk, H. Basri; Soylak, Mustafa; Ozdes, Duygu; Serencam, Huseyin; Imamoglu, Mustafa
The ability of activated carbon which was produced by chemical activation using zinc chloride from tea industry wastes (TIWAC) to adsorb phenol molecules from aqueous solution was tested by equilibrium, kinetic, and thermodynamic parameters. Phenol adsorption on TIWAC took place with a high yield at pH values in the range 4 to 8. The optimum contact period was observed as 4.0 h and from the adsorption graphs plotted as a function of time; it was established that phenol adsorption on TIWAC conformed more to a pseudosecond-order kinetic model. Additionally, it was determined that the adsorption rate is controlled by intraparticle diffusion as well as film diffusion. It was established that phenol adsorption on TIWAC can be better defined by the Langmuir adsorption model and its adsorption capacity was 142.9 mg.g(-1) from the linear Langmuir equation. Temperature had an adverse effect on adsorption yield, and hence, the adsorption process was exothermic in our case. Moreover, increasing electrolyte concentration in the medium has a positive effect on adsorption yield. From the data obtained, it was concluded that the removal of phenol from aqueous solution by TIWAC produced from tea industry wastes with a very low cost took place with an extremely high performance.
AtıfScopus228WoS212OpenAlex222İncele - MakaleYalnız künye2012Scopus SJRQ1Evaluation of the numerical wave model (SWAN) for wave simulation in the Black Sea
Akpinar, Adem; van Vledder, Gerbrant Ph.; Kömürcü, Murat Ihsan; Özger, Mehmet
This study summaries the implementation of the SWAN model forced by the ECMWF ERA Interim dataset reanalyzed 10 m winds over the Black Sea which will be used to study the wind-wave climate and wave energy potential in the region, and its verification. The SWAN model results were compared with directional buoy measurements at three locations along the north and south coasts of the Black Sea, parametric model results based on the JONSWAP growth relations, and the results of previous studies. The SWAN model has been applied in a third generation and non-stationary mode with spherical coordinates. The linear and exponential growth from wind input, depth-induced wave breaking, bottom friction, whitecapping, four-wave (for deep water) and triad-wave (for shallow water) nonlinear interactions have been activated in the simulations. The results of this study indicate that agreement between simulated and observed wave parameters is satisfactory and it is slightly more accurate than the results of the previous studies. However, it still has lower estimates for the maximum values of both wave parameters. These lower estimates are probably due to too low wind speeds in the applied ECMWF wind fields, which is probably caused by orographic effects, and due to the relatively course resolution in time and space of the ECMWF (ERA-Interim) wind fields for the Black Sea. (C) 2012 Elsevier Ltd. All rights reserved.
AtıfScopus146WoS127OpenAlex157İncele - MakaleAçık Erişim2012Alcohol Consumption Among Inflammatory Rheumatic Patients: A Survey From Turkey
Çay, H. Fatih; Illeez, Ozge; Kocabas, Hilal; Sezer, Ilhan; Kaptanoglu, Ece; Kaçar, Cahit
Objectives: In this study, we aimed to evaluate alcohol consumption of Turkish rheumatic patients. Patients and methods: A total of 332 subjects [185 males and 147 females; mean ages of 41.2 (95% CI 39.5-43.0) and 45.2 (95% CI 43.4-47.1) years, respectively] with rheumatoid arthritis (RA), ankylosing spondylitis (AS) and healthy controls were questioned regarding their alcohol habits. Alcohol consumers were asked to fill out the Turkish version of the Michigan Alcoholism Screening Test (MAST). Results: A total of 37.3% of all subjects were alcohol consumers. Nearly 50% of males and 20% of females drank alcohol. Rheumatoid arthritis group had the lowest rate of alcohol consumption (23.0%), while healthy controls had the highest rate (45.6%). The mean MAST scores were 3.02 (95% CI: 2.36-3.69) and 3.13 (95% CI: 1.76-4.5) for the AS and RA groups, respectively, indicating statistically lower rate compared to the healthy controls [4.94 (95% CI: 4.14-5.73) (p<0.001)]. An analysis of the MAST scores by categories revealed that most of the alcohol abusers/alcoholics were in the healthy control group. Conclusion: Our results showed that alcohol consumption, an important public health problem, has not been regarded as a major issue for the patients with rheumatic diseases. Further studies are required to evaluate the potential factors which may play a role in the alcohol consumption habits of rheumatic patients.
- MakaleAçık Erişim2012Scopus SJRQ1Adaptive multi-step differential transformation method to solving nonlinear differential equations
Gökdogan, Ahmet; Merdan, Mehmet; Yildirim, Ahmet
In this paper, we propose a fast and effective adaptive algorithm for the multi-step differential transformation method (MsDTM). This approach named as the adaptive MsDTM is applied to a number of nonlinear differential equations and numerical results are given. At the same time, a comparison between the MsDTM and the adaptive MsDTM reveals that the proposed approach is an efficiency tool for solving the considered equations using fewer time steps. (C) 2011 Elsevier Ltd. All rights reserved.
AtıfScopus47WoS30OpenAlex48İncele - BildiriYalnız künye2011Scopus SJRQ2AN UNUSUAL CLINICAL STATE: ATRIAL FIBRILLATION DUE TO MAD-HONEY INTOXICATION
Memetoglu, M. E.; Kalkan, A.; Kurtcan, S.; Kara, V.; Ertas, G.; Cetinkaya, A. S.; Talay, S.; Tutar, N.; Yesilkaya, S.
AtıfWoS1OpenAlex2İncele - MakaleYalnız künye2011Scopus SJRQ2Geochemical and Sr-Nd isotopic characteristics of post-collisional calc-alkaline volcanics in the eastern Pontides (NE Turkey)
Arslan, Mehmet; Şen, Cüneyt; Kaygusuz, Abdullah; Siebel, Wolfgang
Doğu Pontidlerde Eosen yaşlı Torul volkanitlerinin ana, iz element, K-Ar yaş ve Sr-Nd izotop verileri incelenmiştir. İncelenen volkanitler, bazaltik andezit, andezit, trakiandezit ve az oranda da trakidasit ve bunların piroklastiklerinden oluşurlar. Volkanitler plajiyoklas (An2–44), hornblend (Mg#= 0.78–0.98), klinopiroksen (Wo ₄₃₋₄₆ En ₄₁₋₄₃ Fs ₁₀₋₁₅), biyotit, kuvars ve az oranda da sanidin fenokristallerinden oluşurlar. Hornblendlerdeki K-Ar yaşları, 43.99 (±2.59) – 33.45 (±2.32) My aralığında olup, Torul volkanitlerinin Orta–Geç Eosen zamanında oluştuklarını göstermektedir. Torul volkanitleri kalk-alkalen karakterli olup orta–yüksek K içeriğine sahiptirler. Volkanitler büyük iyon yarıçaplı elementler (LILE) ve hafif hafif nadir toprak elementlerce (LREE) zenginleşmiş, yüksek çekim alanlı elementlerce (HFSE) tüketilmişlerdir. Kondrite normalize edilmiş nadir toprak element dağılımları, düşük–orta derecede zengileşmeyle konkav şekilli olup (La _cn/Lu _cn= 4.0–9.8), volkanitleri oluşturan kayaçların benzer kaynaktan itibaren oluştuklarını düşündürmektedir.⁸⁷Sr/⁸⁶Sr(i) değerleri 0.70457–0.70511 arasında olup ¹⁴³Nd/¹⁴⁴Nd(i) değerleri 0.70457–0.70511 arasındadır. Volkanitlerin gelişiminde başlıca fraksiyonel kristallenme, daha az oranda da kabuksal kirlenme ± magma karışımı rol oynamıştır. Tüm bu veriler, volkanitlerin köken magma(lar)sının muhtemelen daha önceki yitim akışkanları tarafından metasomatizmaya uğratılmış zenginleşmiş bir üst manto kaynağından, çarpışma sonrası jeodinamik bir ortamda türeyebileceklerini ifade etmektedir.
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