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Articles 8071 - 8100 of 10319
Full-Text Articles in Physical Sciences and Mathematics
Synthesis Of New 5-Aryl Pyrido [3´, 2´: 4, 5] Thieno [2, 3-E] [1, 2, 3, 4] Tetrazolo [1, 5-C}] Pyrimidine Derivatives, Abolghasem Davoodnia, Mehdi Bakavoli, Mahsan Bashash, Mina Roshani, Rahele Zhiani
Synthesis Of New 5-Aryl Pyrido [3´, 2´: 4, 5] Thieno [2, 3-E] [1, 2, 3, 4] Tetrazolo [1, 5-C}] Pyrimidine Derivatives, Abolghasem Davoodnia, Mehdi Bakavoli, Mahsan Bashash, Mina Roshani, Rahele Zhiani
Turkish Journal of Chemistry
The synthesis of new 5-arylpyrido [3', 2': 4, 5] thieno [2, 3-e][1, 2, 3, 4] tetrazolo[1, 5-c] pyrimidine derivatives is described.
Catalytic Combustion Of Ethyl Acetate, Tuğba Gürmen Özçeli̇k, Süheyda Atalay, Erden Alpay
Catalytic Combustion Of Ethyl Acetate, Tuğba Gürmen Özçeli̇k, Süheyda Atalay, Erden Alpay
Turkish Journal of Chemistry
The catalytic combustion of ethyl acetate over prepared metal oxide catalysts was investigated. CeO, Co_2O_3, Mn_2O_3, Cr_2O_3, and CeO-Co_2O_3 catalysts were prepared on monolith supports and they were tested. Before conducting the catalyst experiments, we searched for the homogeneous gas phase combustion reaction of ethyl acetate. According to the homogeneous phase experimental results, 45% of ethyl acetate was converted at the maximum reactor temperature tested (350 °C). All the prepared catalysts were tested in order to find the best catalyst for the complete combustion of ethyl acetate. According to the results, all these catalysts produced higher conversion rates than that …
A Convenient And Efficient Synthesis Of N-Acylsulfonamides In The Presence Of Silica Phosphoric Acid Under Heterogeneous And Solvent-Free Conditions, Ahmad Reza Massah, Mina Dabagh, Maryam Afshar, Ahmad Reza Momeni, Hamid Aliyan, Hamid Javaherian Naghash
A Convenient And Efficient Synthesis Of N-Acylsulfonamides In The Presence Of Silica Phosphoric Acid Under Heterogeneous And Solvent-Free Conditions, Ahmad Reza Massah, Mina Dabagh, Maryam Afshar, Ahmad Reza Momeni, Hamid Aliyan, Hamid Javaherian Naghash
Turkish Journal of Chemistry
Reaction of sulfonamides with carboxylic acid anhydrides and chlorides in the presence of silica phosphoric acid provided N-acyl sulfonamides in good to high yields. All reactions were performed under mild conditions in solvent-free and heterogeneous systems and the products were obtained in high purity after a simple work-up. Silica phosphoric acid could be reused for 3 times without visible loss of activity.
Fused Heterocycles: Synthesis Of Some New Imidazopyridines As Anti-Mycobacterial Agents, Bi̇rgül Özden Kasimoğullari, Zafer Cesur
Fused Heterocycles: Synthesis Of Some New Imidazopyridines As Anti-Mycobacterial Agents, Bi̇rgül Özden Kasimoğullari, Zafer Cesur
Turkish Journal of Chemistry
The reaction of semicarbazones bearing an imidazo[1,2-a]pyridine ring system with mercaptoacetic acid was investigated. The anti-mycobacterial activity of the compounds thus obtained were evaluated against Mycobacterium tuberculosis H_{37}Rv, using rifampin as the standard. Only IVe showed activity at 6.25 \mu g mL^{-1}.
Preconcentration Of Trace Elements On Amberlite Xad-4 Resin Functionalised With 1,2-Bis (O-Aminophenylthio) Ethane And Their Determination By Faas In Environmental Samples, Ömer Dalman, Volkan Numan Bulut, İsmai̇l Deği̇rmenci̇oğlu, Mehmet Tüfekçi̇
Preconcentration Of Trace Elements On Amberlite Xad-4 Resin Functionalised With 1,2-Bis (O-Aminophenylthio) Ethane And Their Determination By Faas In Environmental Samples, Ömer Dalman, Volkan Numan Bulut, İsmai̇l Deği̇rmenci̇oğlu, Mehmet Tüfekçi̇
Turkish Journal of Chemistry
The use of chemically modified XAD-4-1,2-bis (o-aminophenylthio) ethane chelating resin for preconcentrating Cr^{6+}, Mn^{2+}, Fe^{3+}, Co^{2+}, Cu^{2+}, Cd^{2+}, Zn^{2+}, Pb^{2+}, and Ni^{2+} was studied using flame atomic absorption spectrometry (FAAS) for metal monitoring in environmental samples. Cd^{2+}, Zn^{2+}, Pb^{2+}, and Ni^{2+} ions were quantitatively recovered at the rate of 96.0%, 101.0%, 101.0%, and 95.0%, respectively (RSD < 5%), from the studied solutions. The procedure is based on the retention of analytes on a short column of 1,2-bis (o-aminophenylthio) ethane-XAD-4 chelating resin from a buffered sample solution and subsequent elution with 1 M HNO_3. Various parameters, such as pH, eluent type, and concentration, flow rate of sample solution and matrix interference effect on the retention of the metal ions have been studied. The optimum pH for the sorption of the above-mentioned metal ions was about 6. The adsorption and batch capacity of adsorbent and loading half time (t_{1/2}) for Ni^{2+}, Zn^{2+}, Cd^{2+}, and Pb^{2+} were established. The limit of detection was 3.0 \mu g L^{-1} for Pb^{2+} and Ni^{2+}, 0.6 \mu g L^{-1} for Cd^{2+}, and 0.3 \mu g L^{-1} for Zn^{2+}. The validation of the procedure was carried out by analysis of certified reference materials and standard addition. The proposed enrichment method was applied to environmental samples from Trabzon.
Synthesis And Isolation Of 1-Cyclohex-1,2-Dien-1-Ylbenzene From 1-(2-Iodocyclohex-1-En-1-Yl)Benzene And 1-(2-Iodocyclohex-2-En-1-Yl)Benzene, Mustafa Ceylan, Yakup Budak, M. Burcu Gürdere, İrfan Özdemi̇r, Esra Findik
Synthesis And Isolation Of 1-Cyclohex-1,2-Dien-1-Ylbenzene From 1-(2-Iodocyclohex-1-En-1-Yl)Benzene And 1-(2-Iodocyclohex-2-En-1-Yl)Benzene, Mustafa Ceylan, Yakup Budak, M. Burcu Gürdere, İrfan Özdemi̇r, Esra Findik
Turkish Journal of Chemistry
The key compounds, 1-(2-iodocyclohex-1-en-1-yl) benzene (12) and 1-(2-iodocyclohex-2-en-1-yl) benzene (13), for the generation of 1-cyclohex-1,2-dien-1-ylbezene (20) were synthesized starting with cyclohexanone. Separate reactions of 12 and 13 with KOtBu in benzene in a sealed tube at 180 °C gave 6 products: 1-cyclohex-1-en-1-ylbenzene (8), 2-phenylcyclohexanone (10), 1,8-diphenyl-2,3,4,4a,4b,5,6,7-octahydrobiphenylene (21), 8a-phenyl-1,2,3,4,6,7,8,8a-octahyd-rotriphenylene (22), 1,2-diphenylcyclohexene (23), and 1-(2-tert-butoxycyclohex-1-enyl) benzene (24). In addition, reactions of 12 and 13 under the same conditions in the presence of diphenylisobenzofuran and furan as trapping reagents afforded the [4 + 2] cyclo-adducts 30, 31, and 32 in good yields, respectively.
Dinuclear Molybdenum Tetracarbonyl Complexes Of Tetradentate Nitrogen Ligands And Intermolecular Hydrogen Bonding In The Crystal Structure Of N,N´-Bis-[1-(Pyridin-2-Yl)Ethylidene]-Ethane-1,2-Diamine, Ayfer Menteş, Seda Sezek, M. Emre Hanhan, Orhan Büyükgüngör
Dinuclear Molybdenum Tetracarbonyl Complexes Of Tetradentate Nitrogen Ligands And Intermolecular Hydrogen Bonding In The Crystal Structure Of N,N´-Bis-[1-(Pyridin-2-Yl)Ethylidene]-Ethane-1,2-Diamine, Ayfer Menteş, Seda Sezek, M. Emre Hanhan, Orhan Büyükgüngör
Turkish Journal of Chemistry
Multidentate N-ligands (Schiff bases) were prepared by the condensation of 2-acetylpyridine or 2-benzoylpyridine, and 1,2-diaminoethane or 1,6-diaminohexane (2:1 ratio) in ethanol. These ligands were reacted with Mo(CO)_6 to obtain dinuclear metal tetracarbonyl compounds. Both terminal amine groups were seen to form imines from the reaction of mono-ketones with diamines in 2:1 or 1:1 ratios. The structures of these ligands and metal complexes were characterized by elemental analysis, and FT-IR, ^1H-NMR, ^{13}C-NMR, and LC-MS spectral techniques. N,N'-bis[1-(pyridin-2-yl)ethylidene]ethane-1, 2-diamine, which was obtained by the reaction of 2-acetylpyridine and 1,2-diaminoethane, was also characterized by single crystal X-ray structure analysis. The crystal packing is …
Synthesis Of The Amide Derivatives Of 3-[1-(3-Pyridazinyl)-5-Phenyl-1h-Pyrazole-3-Yl]Propanoic Acids As Potential Analgesic Compounds, Erden Banoğlu, Murat Şüküroğlu, Burcu Çalişkan Ergün, Sultan Nacak Baytaş, Eda Aypar, Mustafa Ark
Synthesis Of The Amide Derivatives Of 3-[1-(3-Pyridazinyl)-5-Phenyl-1h-Pyrazole-3-Yl]Propanoic Acids As Potential Analgesic Compounds, Erden Banoğlu, Murat Şüküroğlu, Burcu Çalişkan Ergün, Sultan Nacak Baytaş, Eda Aypar, Mustafa Ark
Turkish Journal of Chemistry
A series of structurally diverse amide derivatives of 3-[1-(3-pyridazinyl)-5-phenyl-1H-pyrazole-3-yl]propanoic acids were prepared and tested for their in vivo analgesic activity using an acetic acid induced writhing test. All the test compounds displayed approximately equipotent analgesic activity to aspirin. The results showed that the analgesic activity of 5a, 5f, 5n, and 5o is significantly higher than that of 5d.
Variational Ground State Approach For A Tunnelling Exciton Coupled To Phonons, Dezider Kulak
Variational Ground State Approach For A Tunnelling Exciton Coupled To Phonons, Dezider Kulak
Turkish Journal of Physics
In this paper a variational study of a tunnelling exciton (Frenkel exciton) coupled to an arbitrary number of phonon modes is presented. The results of our model are presented both for weak non-adiabatic cases and for strong cases; and we come to the conclusion that the tunnelling reduction factor, the ground state energy of the tunnelling exciton-phonons system, and the mean number of ground state phonons, as the functions of the exciton-phonons coupling strength, are continuous, a condition that does not apply in cases of the tunnelling exciton-phonons models presented in the previous studies. In comparison with the previous studies, …
Distribution Of Circles On A Circle And Correlation Between Vortex Rings Of Superfluids, Mehmet Onur Fen, Şaki̇r Erkoç
Distribution Of Circles On A Circle And Correlation Between Vortex Rings Of Superfluids, Mehmet Onur Fen, Şaki̇r Erkoç
Turkish Journal of Physics
Superfluids are characterized by absence of viscosity. When superfluids are rotated, differently from normal fluids, they form more than one vortex in the containers where they are placed. The number of vortices change as the rotation velocity changes, but this change is not linear. M.W. Zwierlein et al. observed the vortices in experiments, observing up to a number of 80. Experiments also showed that the vortex distributions cannot include large spaces. By using experimental data, we noticed that when we think of vortices as vortex rings, their centers are at the same geometric location and these geometric locations are concentric …
Interface And Surface Optical Phonons Spectra In Wurtzite Nitride Quantum Well Wires: Size And Dielectric Effects, Li Zhang
Turkish Journal of Physics
By employing the method of electrostatic potential expansion, the interface optical (IO) and surface optical (SO) phonon modes and the corresponding Fröhlich-like electron-phonon-interaction Hamiltonian in a Q1D wurtzite cylindrical quantum well wire (QWW) embedded in nonpolar dielectric matrix are derived and studied based on the dielectric continuum model and Loudon's uniaxial crystal model. Numerical calculations for a wurtzite GaN/AlN QWW are mainly focused on the size- and dielectric-dependent IO and SO phonon spectra and electron-IO (SO)phonons coupling functions. Results reveal that, in general, there are two branches of IO phonon modes and one branch of SO mode in the system. …
Role Of Sn In The Density Of Defect States In A-Se_{0.75}Te_{0.25} And A-Se_{0.85}Te_{0.15}Thin Films, N. Sharma, Santosh Kumar
Role Of Sn In The Density Of Defect States In A-Se_{0.75}Te_{0.25} And A-Se_{0.85}Te_{0.15}Thin Films, N. Sharma, Santosh Kumar
Turkish Journal of Physics
In this paper we report the effect of Sn incorporation in the density of defect states of two binary Se-Te glassy systems, comparing the properties of a-Se_{0.75}Te_{0.25}, a-Se_{0.85}Te_{0.15} and a-Se_{0.75}Te_{0.15}Sn_{0.10} glassy alloys. Properties of d.c. conductivity at high electric fields in vacuum were examined; and current-voltage (I-V) characteristics have been measured at various fixed temperatures. Ohmic behavior is observed at low electric fields; while at high electric fields (E \sim 10^4 V/cm), non-ohmic behavior is observed. An analysis of the experimental data confirms the presence of space charge limited conduction (SCLC) in the studied glassy materials. Density of defect states …
Thickness Dependent Structural, Electrical And Optical Properties Of Chemically Deposited Nanopartical Pbs Thin Films, A. U. Ubale, A. R. Junghare, N. A. Wadibhasme, A. S. Daryapurkar, R. B. Mankar, V. S. Sangawar
Thickness Dependent Structural, Electrical And Optical Properties Of Chemically Deposited Nanopartical Pbs Thin Films, A. U. Ubale, A. R. Junghare, N. A. Wadibhasme, A. S. Daryapurkar, R. B. Mankar, V. S. Sangawar
Turkish Journal of Physics
Nanostructured thin films have attracted the attention of an increasing number of researchers from several disciplines during the last ten years, due to their outstanding electronic and optical properties and extensively useful applications in various optoelectronic devices. PbS thin films were deposited onto glass substrate by the method of chemical bath deposition (CBD) at 330 K temperature. The structure and surface morphology of the films were characterized by X-ray diffraction and scanning electron microscopy. The optical investigation showed that, depending on thickness films have direct allowed transitions in the range 1.88-2.28 eV. The decrease in dc dark resistivity with increase …
Evaluations Of Resonance Parameters And Resonance Integral Of Tungsten, A.K.M. Moinul Haque Meaze
Evaluations Of Resonance Parameters And Resonance Integral Of Tungsten, A.K.M. Moinul Haque Meaze
Turkish Journal of Physics
I present evaluated values of resonance parameters and resonance integral for natural tungsten on the basis of experimental transmissions data obtained at the Pohang Neutron Facility (PNF), Republic of Korea. Resonance parameters were obtained by using the Bayesian code SAMMY. The output values of SAMMY were used to evaluate the resonance integral for the capture cross-section.
Exact Analytical Solution Of The Diode Ideality Factor Of A Pn Junction Device Using Lambert W-Function Model, Habi̇be Bayhan, A. Sertap Kavasoglu
Exact Analytical Solution Of The Diode Ideality Factor Of A Pn Junction Device Using Lambert W-Function Model, Habi̇be Bayhan, A. Sertap Kavasoglu
Turkish Journal of Physics
The paper presents a new analytical method for extracting the diode ideality factor of a p-n junction device using Lambert W-function model and the dark current-voltage data. The extracted values are found to be in good agreement with those calculated experimentally from dark current-voltage characteristics.
Constraints On The Origin Of The Balıkesir Thermal Waters (Turkey) From Stable Isotope (\Delta^{18}O, \Deltad, \Delta^{13}C, \Delta^{34}S) And Major-Trace Element Compositions, Hali̇m Mutlu
Turkish Journal of Earth Sciences
The Balıkesir thermal waters in northwestern Turkey have discharge temperatures in the range of 31.8-98.5 ºC, near neutral pH values of 6.40 to 8.40 and TDS contents between 327 and 2578 mg/l. Samples display variable chemical compositions changing from high-temperature Na_2SO_4-NaHCO_3 waters to warmer CaHCO_3 waters. Trace element concentrations of the waters show significant variation. Comparison between the concentrations of alkaline earth metals in waters and carbonate deposits reveals mobile behavior for Mg and Ba. The ratio of strontium to calcium concentrations in solid and liquid phases was found to be almost the same. Li/Cs and B/Cl ratios of waters …
Origin Of Kaolin Deposits: Evidence From The Hisarcık (Emet-Kütahya) Deposits, Western Turkey, Ali̇ Sayin
Origin Of Kaolin Deposits: Evidence From The Hisarcık (Emet-Kütahya) Deposits, Western Turkey, Ali̇ Sayin
Turkish Journal of Earth Sciences
Kaolin deposits, situated approximately 20 km south of Hisarcık, have been formed by the alteration of dacite and dacitic tuffs related to the Miocene volcanism associated with extensional tectonics. The Hisarcık kaolin deposits occur in the Kızılcukur, Ulaşlar and Kurtdere areas. Kaolinite is the only clay mineral associated with a-quartz, K-feldspar, plagioclase, alunite, natroalunite and hematite in some kaolins, whereas, other kaolinite accompanies smectite, which represents a moderate kaolinization. Low-cristobalite is the dominant silica mineral in these kaolins. In spite of strong kaolinization, the kaolins contain a high amount of finely-disseminated a-quartz in places, resulting in low Al_2O_3 values (13.80 …
Stream Sediment Geochemical Exploration For Gold In The Kazdağ Dome In The Biga Peninsula, Western Turkey, Hüseyi̇n Yilmaz
Stream Sediment Geochemical Exploration For Gold In The Kazdağ Dome In The Biga Peninsula, Western Turkey, Hüseyi̇n Yilmaz
Turkish Journal of Earth Sciences
The Tuztaşı Au-Ag mineralized system was discovered within the Kazdağ dome using BLEG (bulk leach extractable gold) and 180-µm stream sediment geochemical data collected across the Biga Peninsula in western Turkey. The deposit is located within the hinge of an antiform consisting mainly of high-grade metamorphic and mélange rocks that include the Altınoluk Pb-Zn-Cu-Ag-Au and Evciler Fe-Au-Cu deposits on the southern and on the northern flanks, respectively; no mineralization has been reported prior to this work which was first carried out in 1996 between Altınoluk and Evciler. The BLEG Ag/Au ratios at Tuztaşı (max 87) and Altınoluk (max 43) are …
Strontium Isotopic And Micropalaeontological Dating Used To Help Redefine The Stratigraphy Of The Neotectonic Hatay Graben, Southern Turkey, Sarah J. Boulton, Alastair H. F. Robertson, Robert M. Ellam, Ümi̇t Şafak, Ulvi̇ Can Ünlügenç
Strontium Isotopic And Micropalaeontological Dating Used To Help Redefine The Stratigraphy Of The Neotectonic Hatay Graben, Southern Turkey, Sarah J. Boulton, Alastair H. F. Robertson, Robert M. Ellam, Ümi̇t Şafak, Ulvi̇ Can Ünlügenç
Turkish Journal of Earth Sciences
In this paper we report for the Hatay Graben, new micropalaeotology, the first strontium dating and new sedimentology. The previous lack of a modern systematic stratigraphy was problematic for the study of the Hatay region. With the new data combined with the existing literature we evaluate and redefine the lithostratigraphy following international standards. The focus of this paper is on the Neogene cover rocks that record the transition from a regional carbonate shelf environment during Palaeocene to Eocene times, through late-stage continental collision, to recent continental rift tectonics that were initiated in the Middle Miocene and continue to operate to …
Late Visean–Early Namurian Bivalves From The Zonguldak Coal Basin, Northwestern Turkey, Yavuz Okan, İzzet Hoşgör
Late Visean–Early Namurian Bivalves From The Zonguldak Coal Basin, Northwestern Turkey, Yavuz Okan, İzzet Hoşgör
Turkish Journal of Earth Sciences
Marine bivalves Septimyalina sublamellosa (Etheridge 1878), Septimyalina lamellosa (de Koninck 1842), Septimyalina minor (Brown 1841) and Posidonia becheri Bronn, 1828 are described from the Visean-Namurian transition of Zonguldak coal basin, Northwestern Turkey. Macroinvertebrate fossils are rare in the Lower Carboniferous of the Zonguldak coal basin and only a few shallow marine forms of Myalinidae and Posidoniidae families are present. Their palaeobiogeographic distribution delineates a seaway from Britain to the Black Sea coast during the Carboniferous.
Lake Hazar Basin: A Negative Flower Structure On The East Anatolian Fault System (Eafs), Se Turkey, Ercan Aksoy, Murat İnceöz, Ali̇ Koçyi̇ği̇t
Lake Hazar Basin: A Negative Flower Structure On The East Anatolian Fault System (Eafs), Se Turkey, Ercan Aksoy, Murat İnceöz, Ali̇ Koçyi̇ği̇t
Turkish Journal of Earth Sciences
The East Anatolian Fault System (EAFS) is a 30-km-wide, 700-km-long and NE-trending sinistral strike-slip megashear belt between the Anatolian platelet in the northwest and African-Arabian plates in the southeast. It is located between Karlıova County in the NE and Karataş (Adana)-Samandağ (Antakya) in the SW. In the Lake Hazar region, the EAFS consists of five fault zones. These are, from north to south, the Elazığ fault zone, the Uluova fault zone, the Sivrice fault zone, the Adıyaman fault zone and the Lice-Çermik fault zone; in previous studies only the Sivrice fault zone has been reported to be part of the …
A N-S-Trending Active Extensional Structure, The Şuhut (Afyon) Graben: Commencement Age Of The Extensional Neotectonic Period In The Isparta Angle, Sw Turkey, Ali̇ Koçyi̇ği̇t, Şule Deveci̇
A N-S-Trending Active Extensional Structure, The Şuhut (Afyon) Graben: Commencement Age Of The Extensional Neotectonic Period In The Isparta Angle, Sw Turkey, Ali̇ Koçyi̇ği̇t, Şule Deveci̇
Turkish Journal of Earth Sciences
The Şuhut graben is an 8-11-km-wide, 24-km-long, N-S-trending, active extensional structure located on the southern shoulder of the Akşehir-Afyon graben, near the apex of the outer Isparta Angle. The Şuhut graben developed on a pre-Upper Pliocene rock assemblage comprising pre-Jurassic metamorphic rocks, Jurassic-Lower Cretaceous platform carbonates, the Lower Miocene-Middle Pliocene Afyon stratovolcanic complex and a fluvio-lacustrine volcano-sedimentary sequence. The eastern margin of the Şuhut graben is dominated by the Afyon volcanics and their well-bedded fluvio-lacustrine sedimentary cover, which is folded into a series of NNE-trending anticlines and synclines. This volcano-sedimentary sequence was deformed during a phase of WNW-ESE contraction, and …
Different Modes Of Stress Transfer In A Strike-Slip Fault Zone: An Example From The North Anatolian Fault System In Turkey, Osman Bektaş, Yener Eyüboğlu, Nafi̇z Maden
Different Modes Of Stress Transfer In A Strike-Slip Fault Zone: An Example From The North Anatolian Fault System In Turkey, Osman Bektaş, Yener Eyüboğlu, Nafi̇z Maden
Turkish Journal of Earth Sciences
The dextral North Anatolian Fault System (NAFS) extends for well over 1000 km from the compressive tectonic domain of eastern Anatolia into the broad and diverse tectonic domain of the western Anatolian, Marmara and Aegean regions. These different tectonic regimes are characterized by a narrow deformation zone in the east and a much broader deformation zone with multiple sub-parallel fault zones in the west. The spatial and temporal distribution of large historical and modern earthquakes (Mw>5) shows two distinctive macro-seismic zones in the eastern and western parts of the NAFS. The eastern macro-seismic zone, between the towns of Erzincan …
A Mineralogical Note On Boulangerite, Geocronite And Yenerite From Near Işık Dağı (Kızılcahamam-Ankara), Turkey, W. E. Sharp, Mark Wieland, Steven K. Mittwede
A Mineralogical Note On Boulangerite, Geocronite And Yenerite From Near Işık Dağı (Kızılcahamam-Ankara), Turkey, W. E. Sharp, Mark Wieland, Steven K. Mittwede
Turkish Journal of Earth Sciences
Microprobe studies have facilitated recognition of the first documented occurrence of geocronite from Işık Dağı (Ankara, Turkey). While yenerite remains a discredited species along the PbS-Sb2S3 compositional join, our analyses show significant arsenic as did the original analyses for yenerite; thus, this name might be retained for arsenic-bearing varieties of boulangerite.
Stratigraphy And Geochemical Features Of The Early Miocene Bimodal (Ultrapotassic And Calc-Alkaline) Volcanic Activity Within The Ne-Trending Selendi Basin, Western Anatolia, Turkey, Yalçin Ersoy, Cahi̇t Helvaci
Stratigraphy And Geochemical Features Of The Early Miocene Bimodal (Ultrapotassic And Calc-Alkaline) Volcanic Activity Within The Ne-Trending Selendi Basin, Western Anatolia, Turkey, Yalçin Ersoy, Cahi̇t Helvaci
Turkish Journal of Earth Sciences
Western Anatolia has experienced thickening and orogenic collapse subsequent to the Eocene continent-arc collision. The early stage of the post-collisional volcanism in the region was thought to have produced widespread lavas and pyroclastic deposits of calc-alkaline basaltic andesite to rhyolite composition. However, in the Selendi Basin, one of the NE-trending basins in western Anatolia, there are two distinct volcanic unit compositions associated with the Lower Miocene sedimentary rocks: (1) a calc-alkaline, high-potassic felsic unit; and (2) alkaline, ultrapotassic lamproitic units, i.e. both are bimodal in character. The calc-alkaline felsic volcanic rocks (Eğreltidağ volcanic unit) are composed of wide-spread pyroclastic rocks …
Pharyngeal Teeth, Lateral Ethmoids, And Jaw Teeth Of Fishes And Additional Fossils From The Late Miocene (Late Khersonian / Early Maeotian) Of Eastern Paratethys (Yalova, Near İstanbul, Turkey), Neri̇man Rühkert Ülkümen, Erdi̇nç Yi̇ği̇tbaş
Pharyngeal Teeth, Lateral Ethmoids, And Jaw Teeth Of Fishes And Additional Fossils From The Late Miocene (Late Khersonian / Early Maeotian) Of Eastern Paratethys (Yalova, Near İstanbul, Turkey), Neri̇man Rühkert Ülkümen, Erdi̇nç Yi̇ği̇tbaş
Turkish Journal of Earth Sciences
A late Khersonian to early Maeotian fossil assemblage from the Upper Miocene to Lower Pliocene Yalakdere Formation near Yalova city (northwestern Anatolia, Turkey) is documented. The following fish taxa, represented by pharyngeal teeth, lateral ethmoids and jaw teeth are described: Cyprinidae with Carassius sp., Tinca sp., Scardinius sp., Leuciscus sp., Barbus sp., Cobitidae with Cobitis sp., Siluridae with Silurus sp., and Esocidae with Esox sp.. Further described vertebrates are reptiles (Trionyx sp.) and small mammals (cf. Eliomys intermedius FRIANT). Additional invertebrate fauna and flora, comprising diverse gastropods, ostracods, charophytes, pollen and limnic green algae, are listed. The fossil assemblage from …
Environmental Impact And Drainage Geochemistry In The Vicinity Of The Harput Pb-Zn-Cu Veins, Elazığ, Se Turkey, Leyla Kalender, Cemal Bölücek
Environmental Impact And Drainage Geochemistry In The Vicinity Of The Harput Pb-Zn-Cu Veins, Elazığ, Se Turkey, Leyla Kalender, Cemal Bölücek
Turkish Journal of Earth Sciences
The aim of this study was to examine the environmental impact of major, minor and rare-earth elements (REE) in spring waters and major and minor elements in stream sediments proximal to known vein-type Pb-Zn-Cu ores. Accordingly, a total of 21 water samples were collected from natural springs in the Köprücük, Çolaklı, Kabakçılar and Ekinli areas where ore-bearing rocks are widely exposed. Stream-sediment samples were taken from the Kurt, Kızıldağ and Karacalar and Billurik streams, and a total of 57 samples were sieved to three different size fractions (-80 +140, -140 +200 and -200 mesh) and analyzed by ICP-MS and IE …
A Condensed Mesozoic Succession North Of İzmir: A Fragment Of The Anatolide-Tauride Platform In The Bornova Flysch Zone, Aral İ. Okay, Demi̇r Altiner
A Condensed Mesozoic Succession North Of İzmir: A Fragment Of The Anatolide-Tauride Platform In The Bornova Flysch Zone, Aral İ. Okay, Demi̇r Altiner
Turkish Journal of Earth Sciences
The Bornova Flysch Zone consists of large blocks of Mesozoic limestone, basalt, serpentinite and radiolarian chert in a highly sheared clastic matrix of latest Cretaceous to Paleocene age. We describe a condensed Mesozoic section from a limestone block near the village of Urbut, 27 km southwest of Bigadiç, north of İzmir. The section, 81 m thick, starts with massive, thickly-bedded Upper Triassic carbonates with megalodonts and foraminifera characteristic of Late Norian-Rhaetian. These are unconformably overlain by condensed, hemipelagic Tithonian-Middle Albian limestones, 19 m thick, with gaps in the succession. The condensed sequence is, in turn, unconformably overlain by red, pink …
Late Ypresian To Middle Lutetian Orthophragminid Record From Central And Northern Turkey: Taxonomy And Remarks On Zonal Scheme, Ercan Özcan, György Less, Botond Kertesz
Late Ypresian To Middle Lutetian Orthophragminid Record From Central And Northern Turkey: Taxonomy And Remarks On Zonal Scheme, Ercan Özcan, György Less, Botond Kertesz
Turkish Journal of Earth Sciences
Orthophragmines are one of the commonest larger foraminifera in the late Paleocene-Eocene shallow-marine deposits of Turkey. Following several common lineages, such as Discocyclina archiaci, Orbitoclypeus schopeni and O. multiplicatus, a major turnover in the orthophragminid composition - both in diversity and abundance - is observed to occur around the early-late Ypresian boundary. This is manifested in the first appearance/dominance of such important lineages like Discocyclina augustae, D. fortisi, Nemkovella strophiolata, Orbitoclypeus douvillei, O. varians, O. furcatus, Asterocyclina stellata and A. alticostata simultaneously with the disappearance of O. multiplicatus and other forms. These and their successors, ranging up at least to …
Petrography, Geochemistry And Origin Of Lower Liassic Dolomites In The Aydıncık Area, Mersin, Southern Turkey, Muhsi̇n Eren, Meryem Yeşi̇lot Kaplan, Selahatti̇n Kadi̇r
Petrography, Geochemistry And Origin Of Lower Liassic Dolomites In The Aydıncık Area, Mersin, Southern Turkey, Muhsi̇n Eren, Meryem Yeşi̇lot Kaplan, Selahatti̇n Kadi̇r
Turkish Journal of Earth Sciences
In the Aydıncık area, the Lower Liassic carbonates consist predominantly of dolomites, including limestone and dolomitic limestone intervals. These carbonates were deposited in peritidal environments, and later underwent early and late stage dolomitization. Petrographically, three dolomite-types are determined: (1) very fine to fine crystalline dolomite (T1) with crystal size of 13-65 µm and a good fabric preservation, (2) coarse crystalline sucrosic dolomite (T2) with size of 65 to 270 µm and fabric destruction, and (3) dolomite cement (T3) that occurs as a clear outer rim to cloudy coarse dolomite crystals (T2) or as a pore-lining and cement-fill of fenestral pores. …