Yazar "Karakaya, Muazzez Celik" seçeneğine göre listele
Listeleniyor 1 - 16 / 16
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe The effect of pH on removal of Cr (VI) by using chabazite(Selçuk Üniversitesi, 2014) Aysan, Hamza; Guclu, Dunyamin; Karakaya, Muazzez CelikIn this study,The natural material chabazite was investigated for its ability to remove chromium(VI) from aqueous solution by batch adsorption experiments.. The effect of operating parameter pH on the adsorption was investigated.The influences of pH (3 to 11) have been reported at keeping constant conditions (Initial concentration=100 mg/L, agitation rate=200 rpm ,temperature = 298 K, contact time 120 min). The results show that adsorption of Cr (VI) strongly depends on the pH of the solution,.The capacity of adsorption of Cr(VI) increased at lower pH'a The maximum adsorption capacity was obtained at pH 3.0. The maximum removal of Cr (VI) was found to be 5 mg/g.Öğe GEOLOGY AND CONDITIONS OF FORMATION OF THE ZEOLITE-BEARING DEPOSITS SOUTHEAST OF ANKARA (CENTRAL TURKEY)(CLAY MINERALS SOC, 2015) Karakaya, Muazzez Celik; Karakaya, Necati; Yavuz, FuatThe pyroclastic sediments studied here contained varied amounts of zeolite and were formed in the saline alkaline Tuzgolii Basin following the alteration of dacitic volcanic materials during the Early to Late Miocene. The present study focused on the geological-geochemical properties of the zeolites and describes their formation. Mineralogical and chemical compositions were determined by X-ray diffraction, scanning electron microscopy, optical microscopy, and inductively coupled plasma mass spectrometry. Results indicated that the zeolitic tuffs consisted mainly of heulandite/clinoptilolite (Hul/Cpt), chabazite, erionite, and analcime associated with smectite. Smectite, calcite, and dolomite are abundant in the clay and carbonate layers which alternate with the zeolitic tuffs. K-feldspar, gypsum, and hexahydrite (MgSO4 center dot 6H(2)O) were also found in some altered tuffs and clay-marl layers as accessory minerals. The zeolite and other authigenic minerals showed weak stratigraphic zonation. Some vitric tuff layers contained no zeolite minerals and others were found to consist of almost pure Hul/Cpt and chabazite layers with economic potential. The rare earth elements (REE), large ion lithophile elements (LILE), and high-field strength elements (HFSE) in the Hul/Cpt-rich tuffs and vitric tuffs were enriched or depleted relative to the precursor rock, while many major elements were slightly or significantly depleted in all zeolitic tuffs. The amounts of REE in the chabazite- and erionite-rich tuffs were generally smaller than those in the precursor rock. The middle and heavy REE (MREE and HREE, respectively) were abundant in the Hull Cpt-rich tuffs, tuffs, and smectitic bentonites. Chondrite-normalized REE values of the sample groups are characterized by sub-parallel patterns with enrichment in LREE relative to HREE. The mineral assemblages and geological setting indicated that zeolite diagenesis occurred in a saline-alkaline basin. The delta O-18 and delta D compositions of the Hul/Cpt, chabazite, and smectite indicated that the minerals formed at low to moderate temperatures and that some of the zeolitization occurred due to diagenetic alteration under closed-system conditions that varied according to the nature of the basin and with the composition and physical properties of the volcanic materials.Öğe MAJOR, REE, TRT, LILE AND HFS ELEMENT BEHAVIOR IN THE ALTERATION OF THE KONYA VOLCANITES (TURKIYE)(INT SCIENTIFIC CONFERENCE SGEM, 2008) Karakaya, Necati; Karakaya, Muazzez CelikMainly high-K, calc-alkaline, Late Miocene to Pliocene volcanic rocks cropped out of Konya area in Central Anatolia, Turkey. The volcanic rocks are predominantly andesitic to dacitic in composition and rarely basalt, basaltic andesite, basaltic trachyandesite and pyroclastics. Mineralogic compositions, major, trace and REE element composition of the investigated rock samples was analyzed. Kaolinite, illite, Ca-montmorillonite, alunite, jarosite, minamiite and silica polymorphs were formed by widespread and intense hydrothermal alteration in or around of the volcanic products. Nearly all major and trace elements are more or less mobile in the samples. The most prominent geochemical characteristics of altered parent rocks include substantial variations in the concentrations of Na, Ca, Mg, Fe, and partly K. Fe2O3+MgO and Na2O+CaO content are between 5.97 and 8.48 in parent rocks which is typically dacite. Increasing alteration intensity is coupled with a gradual decrease in these elements, in weakly altered rocks 5.31 and 7.0, while in moderately altered rocks 1.21 and 0.63, respectively. The element contents Culminating in intensely altered kaolinitic (1.29 and 0.55) and alunitic rocks (0.22 and 0.55). This decreasing trend is indicative of plagioclase destruction and formation of argillization and sericitization. Loss of alkalis and Fe and Mg causes to enrichment of Al and Si in altered rocks and seems to be an important alteration effect for the area as well. Al is mainly enriched all rocks group, Fe+Mg were leached, except weakly altered ones. These elements show important decrements relative to parent and weakly altered rocks. The parent rock has a CIA of 49.85. CIA of weakly altered rocks is 51.41 and has a REE pattern almost identical to the parent rock. Moderately weathered rock has a CIA of 85.35 and is depleted in total REEs relative to the parent. REE patterns and total REE contents of the kaolinitic with CIA value of 97.87 and alunitic samples having CIA value of 79.43 are different from each other and the parent and the other rock groups. The total REE, TRTE and LIL element content are higher in alunitic rocks than the other alteration products. The HFS elements are shown visible changes in studied sample suites, meanwhile its concentrations is lower in kaolinitic rocks than the other sample groups. Slightly negative Eu anomalies were observed in parent and weakly altered rocks while the other sample groups show no Eu anomaly. The HFS and TRT elements are slightly mobilized in weakly altered rocks, whereas enriched in other alteration types. Elements commonly assumed to be immobile (e.g., Y, Zr, Nb, Hf, TiO2, Al2O3, REE) show variation in mass calculation. LIL elements showed enrichment over REE and MREE, and similar behavior, while opposite to HFSE. A clear increment of trans-transition elements (TRTE) were found in mainly in alunitic and partly in kaolinitic samples.Öğe MINERALOGIC AND GEOCHEMICAL FEATURES OF NEOGENE AGED SEDIMENTARY UNITS OF POLATLI, SW ANKARA (TURKEY)(INT SCIENTIFIC CONFERENCE SGEM, 2008) Karakaya, Muazzez Celik; Karakaya, NecatiUpper Paleozoic aged metamorphic rocks, which consist of micaschist, phyllite, metasandstone, marbles, meta dolomitic limestones were located at the basement. Upper Cretaceous ultrabasics have been overturned upon the Paleozoic metamorphic rocks. The Late Upper Cretaceous plutonic rocks are unconformably overlain by the Late Miocene-Early Pliocene volcanics, volcanism composed mainly tuffs and minor amount of volcanic breccia, agglomerate, trachyte and trachyandesitic lava flows and lacustrine volcano-sedimentary rocks. The volcano-sedimentary rocks generally composed of elastic, clayey, calcareous rocks (dolomitic and calcitic), tuffceous, evaporitic and silicified sediments. Mineralogic and geochemical properties of Neogene aged sedimentary units were investigated along from fourteen stratigraphic sections. Dolomite and dolomite+sepiolite are found in the bottom layers while calcite+dolomite and mainly calcite occur in the upper layers. In addition to carbonate minerals, some clay and nonclay minerals are determined, generally in the middle layers of some sections. Non clay minerals are mainly quartz, feldspar and gypsum. Palygorskite, smectite (montmorillonite and) saponite and illite minerals are other clay minerals that are found in less quantity. Brown, pale brown and white sepiolite types were defined by means of colour. XRD, chemical analysis, SEM and EDS were made in all samples, and also delta O-18 and delta C-13 isotope analysis of calcite and dolomite were made. Mineralogic composition, REE, TRTE, HFS and LIL element content of different stratigraphic section were determined. Mineralogic composition was generally controlled by major element content. Sepiolite content of the sections are controlled by generally SiO2, detrital mineral and partly MgO content. The composition of most calcites and dolomites are relatively homogeneous and low-Mg or high-Ca to near stoichiometry (3.029Öğe MINERALOGICAL AND CHEMICAL PROPERTIES AND THE ORIGIN OF TWO TYPES OF ANALCIME IN SW ANKARA, TURKEY(CLAY MINERALS SOC, 2013) Karakaya, Necati; Karakaya, Muazzez Celik; Temel, AbdinAuthigenic analcimes were observed in different amounts in Miocene units in central Anatolia, Turkey. Two types of analcime occurrences were defined: (1) as continuous but inhomogeneous concentrations varying from 3 to 75 wt.% in lacustrine sedimentary rocks; and (2) as low concentrations (between 3 and 20%) and discontinuous components in the tuffs and claystones intercalated with tuff. The type 2 analcimes have been investigated by many researchers while the origin and properties of the sedimentary analcimes, which are widespread in different parts of Turkey, have not been clarified. The present study focused on the genesis and the mineralogical and geochemical properties of both types of analcime. The analcimes were investigated using X-ray diffraction, optical microscopy, scanning electron microscopy, and chemical analytical methods. In the first type, other than volcaniclastic material, analcime is the only zeolite mineral. The first type of analcime was associated mainly with montmorillonite, dolomite, and feldspar and sometimes with calcite, and rarely with illite and kaolinite. The second type of analcime was found as an accessory mineral accompanied by montmorillonite, feldspar, and heulandite/clinoptilolite, and more rarely by erionite, kaolinite, and mica. The pyroclastic rocks are chemically classified into two subgroups, dacitic and andesitic rocks, with an intermediate to high silica content and a high percentage of alkali cations. Analcime in the pyroclastics intercalated with clay layers commonly replaced early-formed zeolites, such as clinoptilolite or volcanic materials. The first type of analcime was not formed from precursor zeolites and had a different origin than the second type. Type 1 analcime contains larger amounts of Si (34.19 to 34.68 Si per unit cell) and less Al and Na than in theoretical analcime. The theoretical structural formula of analcime is Na-16(Al16Si32O96)H2O. The strongly decomposing feldspar and clay minerals (in particular montmorillonite and partially illite) of the older formations and the dissolution of halite and also soda minerals, e.g. thenardite and glauberite, allow the authigenic formation of type 1 analcime, dolomite, K-feldspar, and montmorillonite in a saline and highly alkaline environment such as the marginal part of Lake Tuzgolu. Type 2 analcime may have been precipitated directly from solution, pyroclastic material, or precursor zeolite minerals in saline and alkaline lake water.Öğe MINERALOGICAL AND GEOCHEMICAL CHARACTERISTICS AND GENESIS OF THE SEPIOLITE DEPOSITS AT POLATLI BASIN (ANKARA, TURKEY)(CLAY MINERALS SOC, 2011) Karakaya, Muazzez Celik; Karakaya, Necati; Temel, AbidinThe Middle-Upper Miocene-Pliocene sediments near Polatli contain commercial sepiolitic clay deposits. The sepiolite-rich Polatli basin sediments were studied to describe the sepiolitic clay deposits of the area and to assess the environments of formation using X-ray diffraction, optical and scanning electron microscopy, and chemical analysis. The Polatli basin is an elongated, rift-related graben trending NE-SW in central Turkey, filled with continental Late Miocene to Early Pliocene sediments. The sediments which comprise claystone, marl and limestone, dolostone, and evaporites are characteristic deposits of low-salinity, playa-lake depositional environments. These sepiolite-rich deposits include sepiolite, dolomite, and calcite, with minor amounts of palygorskite, quartz, moganite, amorphous silica (opal-CT), and feldspar. The sepiolite shows all the characteristic X-ray diffraction reflections of that mineral, whereas amorphous silica containing sepiolite shows some of the characteristic reflections of sepiolite, but with somewhat broader and less intense basal reflections. In the siliceous deposits, the long, fibrous, and filamentous aggregates of the sepiolite were converted to thick, short fibers, low in Mg, and showing transition to amorphous silica. Major and trace elements (e.g. Si, Al, Fe, Mg, Sr, Ba, etc.) were found almost exclusively in Mg-rich smectitic claystone and detrital silicate-rich rocks, whereas Mg, Ca, and some Si were concentrated in the neoformed minerals in the basin. The rare-earth elements (REE) and some of the high-field strength elements (HFSE), large ion lithophile elements (LILE), and transition elements (TRE) patterns were similar for detrital silicate-rich rocks and formed from neoformed mineral lithologies. The REE, TRE, LILE, and some of the HFSE contents of limestone, dolostone, and sepiolitic claystone were similar while those of detrital silicate-rich rocks and Mg-rich smectitic claystones were similar to each other. PAAS-normalized REE and other trace-element patterns were typically subparallel and depleted in neoformed minerals. All sample groups had positive Eu* anomalies, except Mg-rich smectite (0.80). Limestone, dolostone, and amorphous silica compounds showed slightly negative Ce* anomalies, whereas sepiolitic claystones, Mg-rich smectitic claystones, and detrital silicate-rich rocks had a slightly positive Ce* anomaly.Öğe Mineralogical and physico-chemical properties of Heu-type zeolitic rocks SE of Ankara, central Turkey(MINERALOGICAL SOC, 2017) Karakaya, Muazzez Celik; Karakaya, Necati; Yavuz, FuatThis study focused on the mineralogical and physico-chemical properties of heulandite/clinoptilolite (Heu/Cpt)-rich zeolitic tuffs SE of Ankara (Turkey) and evaluated their potential for use as adsorbents. The main Heu/Cpt minerals correspond to the intermediate type and the Cpt-type of the heulandite series. Minor chabazite, erionite and rarely analcime and accessory feldspars, mica, smectite, and quartz were also detected. Three types of Heu were recognized according to their thermal behaviour. Cpt (type-III Heu) was thermally stable at 600 degrees C, whereas type-I Heu collapsed and type-II Heu partially collapsed. The Si/Al ratios of the Hul/Cpt ranged from 3.54 to 5.03, the G parameter (G = Ca/Al + 0.115* Al) varied between 0.78 and 1.85 and Al + Fe3+ varied between 6.27 and 8.00. The Na, K and Ca contents of Heu/Cpt varied widely and the Heu had an intermediate composition between types II and III. The Mg + Ca content is greater than the Na + K content in Heu-type II and smaller in Heu-type III zeolites. The BET surface area and the pore-size of the samples varied between 10.15 and 194.27 m(2)/g, and between 1.41 and 12.42 nm, respectively. The N-2 adsorption and desorption isotherms were comparable, but the adsorption/desorption capacity is greater in type III than in type II Heu zeolites. The cation exchange capacities of the Heu/Cpt-rich samples ranged from 185 to 280 meq/100 g.Öğe Potential Bioaccumulator Mosses around Massive Sulfide Deposits in the Vicinity of the Giresun Area, Northeast Turkey(WILEY, 2015) Karakaya, Muazzez Celik; Karakaya, Necati; Kupeli, Suayip; Karadag, Mehmet Muzaffer; Kirmaci, MesutThe study area located in the western part of the Eastern Pontides, NE Turkey, represents the eastern part of the metallogenic province of the Black Sea region. The soil, water, and some mosses from the area contain heavy metal pollution from the mines and tailings of the abandoned and partially active massive sulfide deposits and their host rocks. The surface/subsurface/underground ore bodies generally cause the acidification of groundwater and the enrichment of heavy and toxic trace metals (Cu, Zn, Cd, Fe, As, and Pb) in the water, soil, and mosses. The mosses are Rhabdoweisia crispata, Pohlia nutans, and Pohlia elongata. R. crispata is a newly reported plant in Turkey, and the abovementioned moss species are observed especially where the toxic element contents of the water and soil are enriched. The mosses are sensitive to the trace metals and thus accumulate metal ions, predominantly Fe, Al, and Mn, which are apparent in the interaction between the water and roots. R. crispata is a better accumulator of trace metals and some major elements than the other mosses. R. crispata is therefore suitable for use in the recovery of polluted soil and water affected by acid mine wastewater from active and/or abandoned mining sites in the NE of Turkey.Öğe PRELIMINARY MINERALOGICAL AND CHEMICAL PROPERTIES OF HALITE IN THE SOUTH OF TUZGOLU BASIN (TURKEY)(GEOBALCANICA SOC, 2017) Ercan, Hatice; Karakaya, Muazzez Celik; Karakaya, Necati; Bozdag, Ayla; Delikan, ArifThe study area is located in the southern parts of Tuzgolu basin namely closed Konya basin, which is one of the largest inner/closed basin of Neogene age in the Central Anatolia (Turkey). The basin was mostly filled with the Late Cretaceous-Quaternary aged different types of minerals. The basin, in deep, starts red colored clastic sediments which are formed from thick red clastic unit was deposited in shallow-deep-shallow marine environments. This study was primarily focused on the textural properties of halite mineral in the Miocene units. The textural properties of the halite mineral have been investigated mainly for detection of environmental conditions and origin of halites as primary and secondary halites. Remnant of chevrons structures are most common primary texture preserved in ancient halite deposits. Upward-growing chevrons determined in the halite minerals show that these textures contain rich fluid inclusions and have cloudy or milky appearance. Halite minerals are interlayered with carbonate, sulfate and clay minerals in the studied core samples. The halite layers are generally observed in thick of mm-dm, salt deposits in the dm-m in size precipitated when condition are suitable that huge thickness of shoal water evaporite can accumulate in very short time frames. The thin laminates of halite indicate the fluid chemistry causing the precipitation and changed in a short time interval of the environment condition. The presence of hoper-textures in halite minerals indicated that the first precipitated on the shallow hyper saline brine pools and when they were undisturbed by wind and waves. The secondary marks were commonly observed in the drillings as the nodular structure anhydrite and mosaic texture of halite. The ratios of Cl/Br and Na/Br in the studied halite samples have very high values that are in relation to dissolution and mixing.Öğe Radioactivity and hydrochemical properties of certain thermal Turkish spa waters(IWA PUBLISHING, 2017) Karakaya, Muazzez Celik; Dogru, Mahmut; Karakaya, Necati; Kuluozturk, Fatih; Nalbantcilar, Mahmut TahirThe study aims to determine the radioactivity levels of thermal waters which have been used seasonally or permanently in spas for therapeutic intentions. Samples were collected from spas in different regions of Turkey. Some radionuclides (K-40, Th-232, Ra-226, Cs-137), gross alpha (GA) and gross beta (GB) activities, and physical and some chemical parameters were measured. Gamma radiation measurements for Ra-226, Th-232 and K-40 radionuclides were performed by using a high purity germanium (HPGe) detector. The results of the gamma spectrometry ranged from 1.385 to 11.025 mBql(-1) for Ra-226, < minimum detectable activity to 3.477 mBql(-1) for 232Th and 9.679 to 36.989 mBql(-1) for K-40. GA and GB activity concentrations were detected by using ultra-low level alpha/beta counter. The GA and GB activity ranged from 43 to 3,182 mBql(-1) and 54 to 1,950 mmBql(-1), respectively. Based on calculated annual effective dose equivalent, the total dose originated mostly from Ra-226 and slightly from K-40. Furthermore, waters with high Cl content were enriched with K-40, Ra-226 isotopes, and the source of GA and GB activity in these waters was mostly Ra-226. Strong high positive correlation between Cl, Ra-226 and total dissolved solids in Cl-enriched samples indicated that the nuclides formed from dissolved minerals in these waters.Öğe Radioactivity concentrations and dose assessments of therapeutic peloids from some Turkish spas(MINERALOGICAL SOC, 2015) Karakaya, Muazzez Celik; Dogru, Mahmut; Karakaya, Necati; Vural, Hasibe Cingilli; Kuluozturk, Fatih; Bal, Sultan SahinThe activity concentrations of natural radionuclides in peloids were studied to assess the radiologic hazard from 18 Turkish spas. The peloids are mainly used for therapeutic treatments, rheumatic diseases and aesthetic purposes. The concentrations of the natural radionuclides Ra-226, Th-232, K-40 and Cs-137 were determined with a gamma ray spectrometer using a HPGe detector. The average activity concentrations of Ra-226, Th-232, K-40, and Cs-137 in the peloids studied were 110.69, 71.52, 576.48 and 0.447 Bq/kg, respectively. The radium equivalent activities in the peloid samples ranged from 63.3 to 766.77 Bq/kg. The absorbed dose rate (D-out) varied between 37.52 and 330.67 nGy/h and most of the observed spa doses are greater than the worldwide recommended values. The annual effective dose values range from 0.26 to 2.78 mu Sv/y. The annual gonadal dose equivalents of the samples vary from 224.07 to 2283.55 with a mean of 821.99 mu Sv/y.Öğe Some properties and potential applications of the Na- and Ca-bentonites of ordu (NE Turkey)(ELSEVIER SCIENCE BV, 2011) Karakaya, Muazzez Celik; Karakaya, Necati; Bakir, SeyfiCa- and Na-bentonites formed throughout the Eastern Black Sea were distinguished on the basis of their mineralogical, chemical, and physical properties. The properties of the Na- and Ca-bentonites were studied using X-ray diffraction, chemical analyses and a series of physical testing methods. Montmorillonite is the major mineral in both bentonites. Except for montmorillonite, the Ca-bentonites (CAB) contain opal-CT, minor amounts of quartz, feldspar and biotite, and (rarely) pyrite and calcite. The Na-bentonites (NAB) contain smectite (montmorillonite) and small amounts of opal-CT, quartz, and feldspar. In the natural state, the chemical and physical properties including cation exchange capacity, viscosity, swelling index, gelling strength and pH of the NAB are higher than the CAB. Surface area and brightness of the CAB are unusually high compared to the NAB. Their bleaching properties are generally similar. The specific surface area and filtration loss of CAB are higher than in NAB. The natural bentonites could be used in paper coating and filling, paint, pharmaceuticals, and as cosmetics and filtering agents after the removal of non-clay minerals and after making some processes/modifications. (C) 2011 Elsevier B.V. All rights reserved.Öğe STRUCTURAL PROPERTIES OF THE NEOGENE EVAPORITE DEPOSITS IN THE SOUTH OF TUZGOLU BASIN, TURKEY(GEOBALCANICA SOC, 2017) Delikan, Arif; Bozdag, Ayla; Karakaya, Necati; Ercan, Hatice; Karakaya, Muazzez CelikTuzgolu Basin located at the Central Anatolia is an inner enclosed basin and is bounded by Ankara uplift in the north, the Kirsehir massif from in the east and the Sivrihisar-Bozdag massif from the west. The Salt Lake is bordered by Tuzgolu, Aksehir and Nigde fault zones in NE-GW direction. Typical mechanical and sedimentary structures in the evaporitic sediments are observed in especially gypsum and anhydrite, partially glauberite and halite deposits. The most prominent structures observed in the investigated cores are usually sequential sedimentation or stratification, other primary structures are slump structures, sub-strata traces, mud cracks and flat conglomeratic gravel sediments. Stratification in the evaporites showed changes in the mineralogical and textural properties from the bed to the bed. There are also settlement/load structures, ripple cross lamination and cross stratification were determined. As a result of sedimentation, sedimentation-grade bedding and intercalation of clay or carbonate mud and salted mineral mud have been observed. The lacustrine sediments in the inner zones of the basin consist of Ca-Na-sulphate, Mg-sulphate sediments, claystone, carbonate alternation and partly laminated. Repeating the evaporitic sediments in mm and cm thickness provides a seasonal sedimentation view.Öğe Trace-element, rare-earth element and boron isotopic compositions of tourmaline from a vein-type Pb-Zn-Cu +/- U deposit, NE Turkey(TAYLOR & FRANCIS INC, 2011) Yavuz, Fuat; Jiang, Shao-Yong; Karakaya, Necati; Karakaya, Muazzez Celik; Yavuz, RehaThis paper reports trace-element, rare-earth element (REE) and boron isotopic compositions of tourmaline in the Asarck granitoid and quartz veins at Sebinkarahisar. Abundant tourmaline occurs in the vein-type Pb-Zn-Cu +/- U deposit, within the northeastern Pontide Metallogenic Belt, both within the Late Cretaceous Asarck granitoid and in associated quartz-tourmaline veins. Tourmaline in the granitoid forms as rosettes up to 1.5cm in diameter, whereas in quartz-tourmaline veins a few centimetres to a few metres wide, it occurs as black needles and masses that cut the pluton. We present a systematic geochemical study of these tourmalines - all of the schorl-dravite series. Tourmalines from the quartz veins contain high concentrations of ore metals such as Ag, Bi and Zn and have higher Sr, Cr and Sn contents than tourmalines in the Asarck granitoid. Tourmalines from intensively altered parts of the pluton are characterized by higher concentrations of trace elements such as Ba, Rb, V, Sc, Th and Zr compared with occurrences in the quartz veins and in the fresh and less-altered granitoid. Chondrite-normalized patterns of REEs in tourmalines from the Asarck granitoid are generally similar to those of tourmalines in the quartz veins. All vein tourmalines, however, are characterized by heavy REE enrichments, in sharp contrast to those in the granitoid. Boron isotopic compositions of tourmalines range from -14.0 to -2.2 parts per thousand and fall within the 11B range of this mineral in granite-related settings. Tourmaline rosettes from the Asarck granitoid show relatively lighter 11B values (-14.0 to -12.2 parts per thousand) in comparison with those in the quartz veins (-10.4 to -2.2 parts per thousand).Öğe The types of hydrothermal alteration and behavior trace elements at around of Eastern Black Sea Volcanites and Sulfide deposits, Turkey(PERGAMON-ELSEVIER SCIENCE LTD, 2010) Karakaya, Necati; Karakaya, Muazzez Celik[Abstract not Available]Öğe Use of chabazite, a naturally abundant zeolite, for the investigation of the adsorption kinetics and mechanism of methylene blue dye(ELSEVIER SCIENCE BV, 2016) Aysan, Hamza; Edebali, Serpil; Ozdemir, Celalettin; Karakaya, Muazzez Celik; Karakaya, NecatiChabazite, one of the common types of zeolite, was used in our study to remove methylene blue (MB) dye from aqueous solutions. The characterization of chabazite was performed using scanning electron microscope (SEM), Fourier Transform infrared (FTIR), X ray diffraction (XRD), and thermogravimetric-differential thermal analyses TG/DTA. During the experimental study, the effects of some parameters, such as contact time, adsorbent dosage, pH, stirring speed, and concentration, on the removal efficiency of chabazite were taken into consideration. To evaluate the experimental data, Langmuir, Freundlich, and Tempkin isotherm models were used. The experimental data were well fitted to the Langmuir isotherm model, with a correlation coefficient of 0.95. The adsorption kinetics of MB dye on chabazite could be described by a pseudo second-order model. (C) 2016 Elsevier Inc. All rights reserved.
