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2019

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Articles 162391 - 162420 of 165286

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Novel Voltammetric Investigation Of Dipyridamole At A Disposable Pencil Graphite Electrode, Iulia Gabriela David, Lorelei Iordache, Dana Elena Popa, Mihaela Buleandra, Victor David, Emilia-Elena Iorgulescu Jan 2019

Novel Voltammetric Investigation Of Dipyridamole At A Disposable Pencil Graphite Electrode, Iulia Gabriela David, Lorelei Iordache, Dana Elena Popa, Mihaela Buleandra, Victor David, Emilia-Elena Iorgulescu

Turkish Journal of Chemistry

The present paper describes the voltammetric analysis of dipyridamole (DIP) at a cheap, disposable pencil graphite electrode (PGE). The working conditions were optimized with regard to the electrode material and the supporting electrolyte. Cyclic voltammetric investigations emphasized that DIP is irreversibly oxidized at the PGE. The electrode process is pH-dependent and controlled by both diffusion and adsorption. For DIP quantitative determination a differential pulse voltammetric (DPV) method in phosphate buffer solution pH 7.00 was developed. DIP's oxidation peak current varied linearly with the analyte concentration, presenting two linear ranges, namely 5.00 $\times $ 10$^{-7}$-2.50 $\times $ 10$^{-5}$ M and 2.50 …

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Synthesis Of Smz Derivatives And Investigation Of Effects On Germination, Root, And Plant Growth Of \Textit{Arabidopsis Thaliana} L., Tuğba Güngör, Ferah Cömert Önder, Fati̇h Sezer, Aslihan Özbi̇len, Kemal Meli̇h Taşkin, Mehmet Ay Jan 2019

Synthesis Of Smz Derivatives And Investigation Of Effects On Germination, Root, And Plant Growth Of \Textit{Arabidopsis Thaliana} L., Tuğba Güngör, Ferah Cömert Önder, Fati̇h Sezer, Aslihan Özbi̇len, Kemal Meli̇h Taşkin, Mehmet Ay

Turkish Journal of Chemistry

A series of sulfonamide derivatives were synthesized by reactions with various functional groups containing benzenesulfonyl chlorides and aniline derivatives under different substitution reaction conditions. The structures of SMZ derivatives were confirmed with melting point, FT-IR, $^{1}$H NMR, $^{13}$C NMR, and LC-MS/MS techniques. In order to investigate the cytotoxic effects of these derivatives, we used a model plant species. The synthesized compounds (S1-S5) and sulfamethazine (SMZ) as a positive control were applied to Arabidopsis thaliana seeds. Our results indicated that S3 and S4 induced shorter roots and lower wet weight in plants. Plants treated with S2 and S5 showed no growth …

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On The Azo Dyes Derived From Benzoic And Cinnamic Acids Used As Photosensitizers In Dye-Sensitized Solar Cells, Luka Matovic, Nikola Tasic, Nemanja Trisovic, Jelena Ladarevic, Vesna Vitnik, Zeljko Vitnik, Branimir Grgur, Dusan Mijin Jan 2019

On The Azo Dyes Derived From Benzoic And Cinnamic Acids Used As Photosensitizers In Dye-Sensitized Solar Cells, Luka Matovic, Nikola Tasic, Nemanja Trisovic, Jelena Ladarevic, Vesna Vitnik, Zeljko Vitnik, Branimir Grgur, Dusan Mijin

Turkish Journal of Chemistry

In order to get a better insight into the relationship between molecular structure and photovoltaic performance, six monoazo dye molecules containing benzoic and cinnamic acid moieties were synthesized and their photovoltaic properties were studied. Three of them have not been previously used in solar cells. Spectroscopic measurements of the investigated compounds coupled with theoretical calculations were performed. Short-circuit current density, open-circuit voltage, and fill-factor were determined. It was found that a larger amount of short-circuit current density will be generated if the HOMO--LUMO energy gap is lower, determined by the stability of the molecule and the electronic effect of the …

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Amino-Functionalized Mesostructured Cellular Foam Silica: A Highly Efficient And Recyclable Catalyst In The Knoevenagel Condensation Reaction, Dong Hao, Hongyuan Yang, Tengfei Zhang, Qing Liu Jan 2019

Amino-Functionalized Mesostructured Cellular Foam Silica: A Highly Efficient And Recyclable Catalyst In The Knoevenagel Condensation Reaction, Dong Hao, Hongyuan Yang, Tengfei Zhang, Qing Liu

Turkish Journal of Chemistry

Mesostructured cellular foam silica was functionalized by an amino group (MCF-NH$_{2})$ using the postsynthesis grafting method and utilized as a recyclable catalyst for the Knoevenagel reaction to afford $\alpha $, $\beta $-unsaturated compounds. The catalyst was systematically characterized by various analyses such as nitrogen adsorption, X-ray diffraction, Fourier transform infrared spectrophotometry, scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, and Hammett indicator method. The results showed that MCF-NH$_{2}$ catalyst was successfully prepared with a high surface area of 215 m$^{2}$ g$^{-1}$ and a large pore volume of 1.37 cm$^{3}$ g$^{-1}$. Compared with the nonfunctionalized MCF sample, the window and cell …

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Cover And Contents Jan 2019

Cover And Contents

Turkish Journal of Chemistry

No abstract provided.

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Givetian/Frasnian (Middle/Upper Devonian) Transition In The Eastern Taurides, Turkey, Recep Özkan, Ati̇ke Nazi̇k, Axel Munnecke, Di̇lek Gülnur Demi̇ray, Eberhard Schindler, Tuba Aydin Özbek, Emi̇ne Şeker Zor, İsak Yilmaz, Rainer Brocke, Recep Hayretti̇n Sancay, Volker Wilde, Mehmet Namik Yalçin Jan 2019

Givetian/Frasnian (Middle/Upper Devonian) Transition In The Eastern Taurides, Turkey, Recep Özkan, Ati̇ke Nazi̇k, Axel Munnecke, Di̇lek Gülnur Demi̇ray, Eberhard Schindler, Tuba Aydin Özbek, Emi̇ne Şeker Zor, İsak Yilmaz, Rainer Brocke, Recep Hayretti̇n Sancay, Volker Wilde, Mehmet Namik Yalçin

Turkish Journal of Earth Sciences

Devonian strata, including siliciclastic and carbonate rocks that were deposited in shallow marine to coastal environments, are widely distributed in the eastern Taurides of southern Turkey. To document the regional formation of the Givetian (Middle Devonian)/ Frasnian (Upper Devonian) boundary, a section in the eastern Taurides was studied in high resolution with regard to biostratigraphy, microfacies, sequence stratigraphy, and the global Frasne Event. The integrated biostratigraphic investigation was based on calcareous benthic foraminifers, ostracods, conodonts, and palynomorphs, which provide a biostratigraphic frame that allows to recognize the Givetian/Frasnian boundary. On the basis of the lithological variation in the outcrop as …

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Cover And Contents Jan 2019

Cover And Contents

Turkish Journal of Earth Sciences

No abstract provided.

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Upper Cretaceous Volcaniclastic Complexes And Calcareous Plankton Biostratigraphy Inthe Western Pontides, Nw Turkey, Katharina Boehm, Michael Wagreich, Erik Wolfgring, Okan Tüysüz, Susanne Gier, İsmai̇l Ömer Yilmaz Jan 2019

Upper Cretaceous Volcaniclastic Complexes And Calcareous Plankton Biostratigraphy Inthe Western Pontides, Nw Turkey, Katharina Boehm, Michael Wagreich, Erik Wolfgring, Okan Tüysüz, Susanne Gier, İsmai̇l Ömer Yilmaz

Turkish Journal of Earth Sciences

This study describes and interprets Upper Cretaceous volcaniclastics interbedded with hemipelagic to pelagic limestones, marls, and turbidites from the Western Pontides, northwestern Turkey. The Dereköy Formation, the Unaz Formation (red pelagic limestone unit), and the Cambu Formation can be distinguished, overlain by the turbiditic Akveren Formation. Biostratigraphic ages from the predominantly volcaniclastic Dereköy Formation indicate Turonian (Dicarinella concavata planktonic foraminifera zone, CC13/UC8-9 nannofossil zones) to middle/late Santonian ages up to CC17/UC13. The Unaz Formation, deposited during the late Santonian (UC13, Dicarinella asymetrica Zone), is overlain by the volcaniclastic Cambu Formation of latest Santonian (CC17b/UC13) to early/middle Campanian (CC20/UC15a) age. However, …

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Sedimentological And Mineralogical Characteristics Of Red Soil In South Pirin Mountains(Southwest Bulgaria), Rossitza Kenderova, Ahinora Baltakova, Marlena Yaneva Jan 2019

Sedimentological And Mineralogical Characteristics Of Red Soil In South Pirin Mountains(Southwest Bulgaria), Rossitza Kenderova, Ahinora Baltakova, Marlena Yaneva

Turkish Journal of Earth Sciences

The northernmost derivation of the Mediterranean climatic influence and the wide distribution of carbonate rocks are factors that could explain red soils distribution in the lands of Southern Bulgaria. However, due to the mainly mountainous landscape, red soils can be found only on certain spots in Bulgaria. One of the most typical examples of red soil can be found in the lands of Nova Lovcha Village in Bulgaria, but this area was not studied in detail due to its border position. In this study, the catena principle was used to estimate the parental material and slope drainage relationships as factors …

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Zircon U-Pb Geochronology, Geochemistry, Sr-Nd Isotopic Compositions, And Tectonomagmatic Implications Of Nay (Ne Iran) Postcollisional Intrusives In The Sabzevar Zone, Alireza Almasi, Mohammad Hassan Karimpour, Reza Arjmandzadeh, José Francisco Santos, Khosrow Ebrahimi Nasrabadi Jan 2019

Zircon U-Pb Geochronology, Geochemistry, Sr-Nd Isotopic Compositions, And Tectonomagmatic Implications Of Nay (Ne Iran) Postcollisional Intrusives In The Sabzevar Zone, Alireza Almasi, Mohammad Hassan Karimpour, Reza Arjmandzadeh, José Francisco Santos, Khosrow Ebrahimi Nasrabadi

Turkish Journal of Earth Sciences

The mafic to felsic intrusive rocks of Nay (IRN) are located in the northeast of the central Iranian block. In this study, we present new major and trace element geochemistry, U-Pb zircon ages, and Sr-Nd isotopic data to discuss the origin of the IRN postcollisional units. The oldest units in the Nay area belong to Paleocene?early Eocene volcanic and pyroclastic series including basalt-andesite, latite, dacite, and tuff. These series are crosscut by subvolcanic and granitoid rocks with lithological composition varying from quartz gabbro to K-feldspar granite. The youngest igneous activity is represented by quartz monzodiorite dikes. Hornblende-biotite quartz monzonite from …

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Mineralogy And Geochemistry Of Feed Coals And Combustion Residues Of The Kangal Power Plant (Sivas, Turkey), Ali̇ İhsan Karayi̇ği̇t, Riza Görkem Oskay, Rod A. Gayer Jan 2019

Mineralogy And Geochemistry Of Feed Coals And Combustion Residues Of The Kangal Power Plant (Sivas, Turkey), Ali̇ İhsan Karayi̇ği̇t, Riza Görkem Oskay, Rod A. Gayer

Turkish Journal of Earth Sciences

This study focuses on mineralogical and geochemical compositions of feed coal (FC) and combustion residues, namely fly ash (FA) and bottom ash (BA) samples, obtained from the Kangal coal-fired power plant in central Turkey. The X-ray powder diffraction data indicate that carbonate and clay minerals are dominant phases in the FC samples. In the FA samples, quartz, hematite, anhydrite, lime, and feldspar are generally dominant and abundant phases, whereas calcite, ettringite, and portlandite are generally more abundant in the BA samples. The elements Mo, Cs, and U are significantly enriched in the studied FC, FA, and BA samples. The statistical …

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Cover And Contents Jan 2019

Cover And Contents

Turkish Journal of Earth Sciences

No abstract provided.

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Graphite In Rocks Of The Popigai Impact Crater: Residual Or Retrograde?, Valentin Afanasiev, Sergey Gromilov, Valeri Sonin, Egor Zhimulev, Aleksei Chepurov Jan 2019

Graphite In Rocks Of The Popigai Impact Crater: Residual Or Retrograde?, Valentin Afanasiev, Sergey Gromilov, Valeri Sonin, Egor Zhimulev, Aleksei Chepurov

Turkish Journal of Earth Sciences

The concentration of diamond-bearing tagamite from the Popigai impact crater produces large amounts of graphite in addition to impact diamonds (1:100, respectively). The question arises of whether this is residual graphite not converted to diamond at the time of the Popigai impact or is a retrograde form resulting from back-conversion of impact diamond to graphite in a high-temperature tagamite melt. Experiments show that graphite from tagamite is a residual phase. Coexistence of lonsdaleite, cubic diamond, and single-crystal graphite within a limited volume may be due to different orientations of the graphite base plane relative to the impact stress direction. Thus, …

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New Fossil Wood Descriptions From The Pliocene Of Central Anatolia And The Presence Of Taxodioxylon In Turkey From The Oligocene To Pliocene, Ünal Akkemi̇k Jan 2019

New Fossil Wood Descriptions From The Pliocene Of Central Anatolia And The Presence Of Taxodioxylon In Turkey From The Oligocene To Pliocene, Ünal Akkemi̇k

Turkish Journal of Earth Sciences

Recent paleobotanical studies on petrified woods revealed valuable information about the Miocene-period trees of Turkey. The purpose of this study is to present new descriptions from the Pliocene of central Anatolia. The materials were collected from a new fossil site of Pliocene age in the village of Yıprak (Çerkeş, Çankırı, Turkey) in central northern Turkey. With this study, a new fossil genus, Cercioxylon Ü. Akkemik, related to modern Cercis L., and a new fossil species of Cupressinoxylon were described, and a long presence of taxodioid type trees from the late Oligocene to Pliocene of Turkey were discussed. The wood composition …

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Late Quaternary Landscape Evolution Of The Southern Marmara Region:Paleogeographic Implications For Settlements, Nw Turkey, Ni̇zametti̇n Kazanci, Zeynep Ergun, Kaan İren, Suzanne A. Leroy, Sonay Boyraz Aslan, Mehmet Sali̇m Öncel, Koray Koç, Alper Gürbüz Jan 2019

Late Quaternary Landscape Evolution Of The Southern Marmara Region:Paleogeographic Implications For Settlements, Nw Turkey, Ni̇zametti̇n Kazanci, Zeynep Ergun, Kaan İren, Suzanne A. Leroy, Sonay Boyraz Aslan, Mehmet Sali̇m Öncel, Koray Koç, Alper Gürbüz

Turkish Journal of Earth Sciences

This study presents the late Quaternary evolution of the southern Marmara region in northwestern Turkey and discusses the suitability of the area for settlements. It is based on interpretation of sediment analyses together with radiometric dates obtained from drilling cores. As three-fourths of the southern Marmara region (ca. 30,000 km2) is covered by the Susurluk Drainage Basin (SDB), the study focuses on this basin. The SDB has a concave surface morphology dipping northward, with highlands in the south (ca. 1300-1700 m a.s.l.) and lowlands in the north (ca. 0-250 a.s.l.). Lake Manyas, Lake Ulubat, and south-north flowing rivers, together with …

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Small Benthic Foraminiferal Biostratigraphy And Palaeoecology During The Campanian-Maastrichtian Transition In North-Western Tunisia, Abdellatif Bejaoui, Ezzedine Saïdi, Dalila Zaghbib-Turki Jan 2019

Small Benthic Foraminiferal Biostratigraphy And Palaeoecology During The Campanian-Maastrichtian Transition In North-Western Tunisia, Abdellatif Bejaoui, Ezzedine Saïdi, Dalila Zaghbib-Turki

Turkish Journal of Earth Sciences

Campanian-Maastrichtian (C-M) sediments in the Kalâat Senan area (north-western Tunisia) include rich microfauna. Small benthic foraminifera (SBF) analysis at the Wadi Necham (ON) section reveals significant biostratigraphic and palaeoecological changes during the C-M transition. A progressive evolutionary trend within the Bolivinoides lineage allowed us to establish the late Campanian B. decoratus Interval Range Zone (IRZ) and two successive zones in the early Maastrichtian, namely the B. miliaris IRZ and the B. draco Total Range Zone (TRZ), which span the standard planktonic foraminifera Gansserina gansseri IRZ. Foraminiferal semiquantitative data from the C-M transition interval at the studied section yield high values …

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Deep Structure Of Central Menderes Massif: Data From Deep Geothermal Wells, Fatma Gülmez, Emre Damci, Umut Bariş Ülgen, Aral Okay Jan 2019

Deep Structure Of Central Menderes Massif: Data From Deep Geothermal Wells, Fatma Gülmez, Emre Damci, Umut Bariş Ülgen, Aral Okay

Turkish Journal of Earth Sciences

The Menderes Massif is a major Alpide metamorphic complex in western Turkey; it is subdivided into southern, central, and northern submassifs by the east-west trending grabens. The basement of the southern Menderes Massif consists of Neoproterozoic micaschists (Selimiye Formation) intruded by Neoproterozoic granites. The basement is overlain by Permo-Carboniferous phyllite, marble, and quartzite (Göktepe Formation), which pass up into a thick sequence of Mesozoic marbles with emery horizons (Milas Marble). The marbles are overlain by latest Cretaceous recrystallized pelagic limestone and Paleocene metaclastics, which are thrusted over by the Lycian nappes. The metamorphism and deformation of the Phanerozoic sequence of …

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Structure Of The Büyük Menderes Graben Systems From Gravity Anomalies, Emre Ti̇mur, İlknur Kaftan, Coşkun Sari, Müjgan Şalk Jan 2019

Structure Of The Büyük Menderes Graben Systems From Gravity Anomalies, Emre Ti̇mur, İlknur Kaftan, Coşkun Sari, Müjgan Şalk

Turkish Journal of Earth Sciences

The Büyük Menderes Graben (BMG) of western Turkey is bounded by E-W oriented normal faults and has been a depositional center for thick sedimentary layers since the Miocene. Four Mio-Pliocene depressions (from west to east, the Çine, Bozdoğan, Karacasu, and Denizli basins) having overall N-S trends are situated just south of the BMG. In this study, we focused on the structural characteristics of the BMG using Bouguer gravity data covering the area between 37°N and 39°N and 26°30'E and 30°E and gravity data along 4 profiles to estimate the discontinuous basement relief of the BMG. Our main objectives were to …

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The Early Eocene Ekmekçi Granodiorite Porphyry In The Karacabey Region(Sakarya Zone, Nw Turkey), Gürsel Sunal, Mehmet Korhan Erturaç, Gülteki̇n Topuz, Aral Okay, Thomas Zack Jan 2019

The Early Eocene Ekmekçi Granodiorite Porphyry In The Karacabey Region(Sakarya Zone, Nw Turkey), Gürsel Sunal, Mehmet Korhan Erturaç, Gülteki̇n Topuz, Aral Okay, Thomas Zack

Turkish Journal of Earth Sciences

The Ekmekçi granodiorite porphyry is a unit in the E-W trending, postcollisional Eocene magmatic rocks of northern Anatolia. It occurs as a relatively small stock, but represents a link between plutonic and volcanic rocks. This Early Eocene granodiorite porphyry intruded into the Upper Triassic rocks of the Karakaya complex in the Sakarya Zone. In this study we present geochemical and zircon U-Pb LA-ICP-MS age data to contribute to understanding the Early Tertiary postcollisional tectonic setting of NW Anatolia. The granodiorite porphyry includes plagioclase, quartz, hornblende, K-feldspar, biotite, and minor zircon, apatite, sphene, and opaque minerals. The stock displays medium-K calc-alkaline …

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Cover And Contents Jan 2019

Cover And Contents

Turkish Journal of Earth Sciences

No abstract provided.

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Petrological Characteristics Of The Middle Eocene Toveireh Pluton (Southwest Of Jandaq, Central Iran): Implications For The Eastern Branch Of The Neo-Tethys Subduction, Masumeh Sargazi, Ghodrat Torabi, Tomoaki Morishita Jan 2019

Petrological Characteristics Of The Middle Eocene Toveireh Pluton (Southwest Of Jandaq, Central Iran): Implications For The Eastern Branch Of The Neo-Tethys Subduction, Masumeh Sargazi, Ghodrat Torabi, Tomoaki Morishita

Turkish Journal of Earth Sciences

The Middle Eocene Toveireh plutonic body is located in the western margin of the Central-East Iranian Microcontinent (CEIM). This plutonic body consists of granodiorite, syenogranite, and monzogranite compositions. Granodiorite is the most predominant rock unit, which is composed of quartz, plagioclase, K-feldspar, hornblende, and biotite main mineral phases. The Toveireh pluton is metaluminous to weakly peraluminous (A/CNK = 0.85-1.04) and shows a calc-alkaline I-type affinity. Primitive mantle-normalized spidergrams show enrichment of large ion lithophile elements (Rb, Ba, Th, U) and light rare earth elements (REEs) (La/YbN = 6.8-8.24), as well as depletion of high-field strength elements (Nb, Ta, Ti, P). …

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Petrography, Geochemistry, And Provenance Of Jurassic Sandstones From Thesakarya Zone, Nw Turkey, Firat Şengün, Osman Ersi̇n Koralay Jan 2019

Petrography, Geochemistry, And Provenance Of Jurassic Sandstones From Thesakarya Zone, Nw Turkey, Firat Şengün, Osman Ersi̇n Koralay

Turkish Journal of Earth Sciences

The Jurassic sandstones exposed in the western part of the Sakarya Zone are yellowish to brown, moderate to well sorted, medium to coarse-grained, grain-supported, and cemented by calcareous and minor silica. Sandstones are mainly classified as litharenite, subarkose, and arkose according to the relative proportions of quartz, feldspar and rock fragments, and major element ratios. On the SiO2 variation diagram, Na2O and K2O show slight positive correlations, which could reflect abundance of sodic plagioclase and K-feldspar with quartz within high Si-content sandstones. Sandstones generally exhibit slight LREE enrichment with respect to HREEs. The REE plots are characteristic for sedimentary rocks …

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Geology, Fluid Inclusion, And Stable Isotope (O, H, S, C) Characteristics Of The Hazinemağara (Gümüşhane) Lead-Zinc Deposit, Ne Turkey, Esra Ünal Çakir, Ahmet Gökce Jan 2019

Geology, Fluid Inclusion, And Stable Isotope (O, H, S, C) Characteristics Of The Hazinemağara (Gümüşhane) Lead-Zinc Deposit, Ne Turkey, Esra Ünal Çakir, Ahmet Gökce

Turkish Journal of Earth Sciences

The Hazinemağara (Gümüşhane) Pb-Zn deposit is located in the southern part of the Eastern Pontides Orogenic Belt in northeastern Turkey. It occurs as irregularly shaped ore bodies with breccia fill structure within the intraformational breccia or brecciated horizons of limestone in the Upper Jurassic-Lower Cretaceous Berdiga Formation. The dominant ore minerals are pyrite, sphalerite, galena, and tetrahedrite, and the major gangue minerals are calcite, quartz, and barite. Microthermometric investigations of the fluid inclusions show that the ore-forming fluids contain CaCl2 and MgCl2 in addition to NaCl. The salinity of the fluid ranges from 1.7% to 9.2% with an average of …

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Plio-Quaternary Stress States Along The Kütahya Fault And Surroundings, Nw Turkey, Eli̇f Akgün, Süha Özden Jan 2019

Plio-Quaternary Stress States Along The Kütahya Fault And Surroundings, Nw Turkey, Eli̇f Akgün, Süha Özden

Turkish Journal of Earth Sciences

The Kütahya Fault, which is one of the major neotectonic structures in western Anatolia, Turkey, is an active fault constraining the southern margin of the approximately E-W trending Kütahya Basin between the Eskişehir Fault to the north and the Simav Fault to the south. In the present study, inversion of both fault kinematic analysis of fault-slip data and focal mechanism solutions from the Kütahya Fault and surroundings is used to understand the Late Cenozoic stress states. The fault kinematic analysis result yielded three different stress regimes from Mio-Pliocene to Quaternary. Firstly, strike-slip faulting developed under a NE-SW trending local compressional …

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Comparison Of Stable Isotope Values Of Quaternary Calcretes From Adana And Mersin Provinces: Implications On Controlling Factors, Muhsi̇n Eren, Meryem Yeşi̇lot Kaplan, Selahatti̇n Kadi̇r, Seli̇m Kapur Jan 2019

Comparison Of Stable Isotope Values Of Quaternary Calcretes From Adana And Mersin Provinces: Implications On Controlling Factors, Muhsi̇n Eren, Meryem Yeşi̇lot Kaplan, Selahatti̇n Kadi̇r, Seli̇m Kapur

Turkish Journal of Earth Sciences

Calcretes are widespread in Adana and Mersin provinces and form under different morphologies. Most calcrete profiles comprise a hard laminated crust/hardpan at the top, gradually intergrading into the nodular and/or tubular/columnar horizon with depth. This study compares the δ18O and δ13C values of calcretes from both provinces and discusses the controlling factors and environmental conditions. The δ18O and δ13C values are characteristic for the pedogenic calcretes. The Adana calcrete mean δ18O values of the hardpan, nodules and tubes, and fractures-infills are 0.69‰, 0.77‰, and 1.04‰ PDB heavier than those of the Mersin calcretes,respectively. The overall difference between the two groups …

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The Geochemical Signatures Of The Silurian?Devonian Succession In Easternsaudi Arabia, Mohamed Soua Jan 2019

The Geochemical Signatures Of The Silurian?Devonian Succession In Easternsaudi Arabia, Mohamed Soua

Turkish Journal of Earth Sciences

This study was performed on 663 sandstone core and cutting samples taken from the Silurian?Devonian succession in five wells, located in eastern Saudi Arabia. This study aimed to correlate the Tawil Formation in the study wells, defining the lower Qalibah/ Tawil and upper Tawil/Jauf boundaries. The Tawil Formation is mostly characterized by clastic-dominated fluvial to marginal marine depositional environments. A chemostratigraphic correlation workflow was established using key element ratios and comprising four zones (C1 to C4) and five subzones (C2-1 to C2-3 and C3-1-C3-2). The chemostratigraphic zonation allowed robust characterization of stratigraphy in the uppermost Qalibah, Tawil, and lower Jauf …

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New Insights On Messinian Evaporites Based On Field And Seismic Interpretations In The Neogene Antalya Basin, Sw Turkey, Sali̇ha Dündar, Baki̇ Erdoğan Varol Jan 2019

New Insights On Messinian Evaporites Based On Field And Seismic Interpretations In The Neogene Antalya Basin, Sw Turkey, Sali̇ha Dündar, Baki̇ Erdoğan Varol

Turkish Journal of Earth Sciences

In situ/primary Messinian upper evaporite is absent in the onland (onshore) sections of the Aksu and Manavgat subbasins (Antalya Basin), where gypsum blocks, gypsum conglomerate, and laminated gypsum beds mixed with siliciclastic materials are collectively present in the uppermost Messinian-?lowermost Pliocene succession. The metric-size resedimented evaporite blocks, mainly derived from selenite-dominated marginal/upper evaporite, were deposited time-equivalent to the lower-middle parts of the reefal Gebiz limestone in the Aksu subbasin. Resedimented bedded evaporites were accumulated after siliciclastic-dominated (fluvio-deltaic) sedimentation of the Taşlık Formation in the Manavgat subbasin (nearby Antalya city). Some bedded/?resedimented gypsums were defined within the Gebiz limestone and the …

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Cover And Contents Jan 2019

Cover And Contents

Turkish Journal of Earth Sciences

No abstract provided.

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The Mineralogical And Geochemical Composition Of Holocene Sediments From Lake Hazar, Elazığ, Eastern Turkey: Implications For Weathering, Paleoclimate, Redox Conditions, Provenance, And Tectonic Setting, Di̇cle Bal Akkoca, Kürşad Kadi̇r Eri̇ş, Memet Namik Çağatay, Demet Bi̇lteki̇n Jan 2019

The Mineralogical And Geochemical Composition Of Holocene Sediments From Lake Hazar, Elazığ, Eastern Turkey: Implications For Weathering, Paleoclimate, Redox Conditions, Provenance, And Tectonic Setting, Di̇cle Bal Akkoca, Kürşad Kadi̇r Eri̇ş, Memet Namik Çağatay, Demet Bi̇lteki̇n

Turkish Journal of Earth Sciences

Mineralogical and geochemical analyses of samples collected from piston core HZ11-P01 at the western margin of Lake Hazar were studied to determine the provenance and weathering conditions on the source area together with tectonic setting of the source rocks, paleoclimate of the region, and paleo-redox conditions of the lake sediments. Nonclay minerals in the sediment core are represented by feldspar, quartz, dolomite, and calcite. The clay mineral assemblage consists of smectite/chlorite mixed-layer clay, chlorite, and illite. Most major, trace, and rare earth element contents of the lake samples are generally similar to those of the catchment area. Chondrite-normalized rare earth …

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Late Holocene Coseismic Rupture And Aseismic Creep On The Bolvadin Fault, Afyon Akşehir Graben, Western Anatolia, Çağlar Özkaymak, Hasan Sözbi̇li̇r, Mertkan Osman Geçi̇evi̇, İbrahi̇m Ti̇ryaki̇oğlu Jan 2019

Late Holocene Coseismic Rupture And Aseismic Creep On The Bolvadin Fault, Afyon Akşehir Graben, Western Anatolia, Çağlar Özkaymak, Hasan Sözbi̇li̇r, Mertkan Osman Geçi̇evi̇, İbrahi̇m Ti̇ryaki̇oğlu

Turkish Journal of Earth Sciences

The Bolvadin Fault, which forms one of the northern boundaries of the Afyon Akşehir Graben, creeps aseismically on the surface of earth and has not generated surface-rupture earthquakes during instrumental time. Our geological mapping and palaeoseismological studies reveal that the Bolvadin Fault is an approximately 2 km wide and 16 km long, dip-slip normal fault. It could generate earthquakes up to Mw 6.48 roughly every 1 ka and the latest surface-rupture event (M > 6) occurred 494 ± 45 years ago on the Bolvadin Fault. The throw over the past 5 Ma is measured as approximately 500 m according to relative …

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