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Articles 6451 - 6480 of 10319
Full-Text Articles in Physical Sciences and Mathematics
Genesis Of The Hydrothermal Karaçayır Kaolinite Deposit In Miocene Volcanics And Palaeozoic Metamorphic Rocks Of The Uşak-Güre Basin, Western Turkey, Selahatti̇n Kadi̇r, Hülya Erkoyun
Genesis Of The Hydrothermal Karaçayır Kaolinite Deposit In Miocene Volcanics And Palaeozoic Metamorphic Rocks Of The Uşak-Güre Basin, Western Turkey, Selahatti̇n Kadi̇r, Hülya Erkoyun
Turkish Journal of Earth Sciences
The Karaçayır kaolinite deposit, situated in the Uşak-Güre basin of western Turkey, is hosted by rhyolite and andesite of the Miocene Dikendere volcanics, and by muscovite schist, glaucophane schist, talc schist and chlorite schist of the Palaeozoic Eşme Formation. The association of kaolinization with silicification and Fe-oxidation, and the presence of pyrite, chalcopyrite and gypsum, suggest that hydrothermal alteration processes in the volcanics and schists were controlled by faults. Thus, prevalent kaolinite is associated with quartz, smectite, illite and opal-CT in the centre of the deposit, with relative increases in smectite, illite, chlorite and Fe (oxyhydr)oxide phases outwards and upwards. …
An Avalanche Hazard Model For Bitlis Province, Turkey, Using Gis Based Multicriteria Decision Analysis, Levent Selçuk
An Avalanche Hazard Model For Bitlis Province, Turkey, Using Gis Based Multicriteria Decision Analysis, Levent Selçuk
Turkish Journal of Earth Sciences
Most avalanche fatalities in Turkey have occurred in Bitlis Province. The scope of this research was to identify the avalanche hazard area of that province, using geographical information system (GIS) based multicriteria decision analysis (MCDA) and to evaluate it by means of sensitivity and accuracy analysis. The model consists of 5 GIS layers: elevation, slope, aspect, vegetation density, and land use. The hazard model is obtained by using a comparison matrix where all identified criteria of GIS layers are compared against each other. The acceptability of the model was determined using historical events. All of these events plotted over the …
Colour Origin Of Red Sandstone Beds Within The Hüdai Formation (Early Cambrian), Aydıncık (Mersin), Southern Turkey, Muhsi̇n Eren, Selahatti̇n Kadi̇r
Colour Origin Of Red Sandstone Beds Within The Hüdai Formation (Early Cambrian), Aydıncık (Mersin), Southern Turkey, Muhsi̇n Eren, Selahatti̇n Kadi̇r
Turkish Journal of Earth Sciences
The basal part of the Hüdai Formation (Early Cambrian) in the Aydıncık (Mersin) area comprises red sandstone beds at different stratigraphic levels, showing ripple cross-lamination. These beds were deposited in the middle to lower part of an intertidal flat environment. Bedding-parallel reddening and its cyclic character suggest syn-sedimentary or early diagenetic red colouration in a marine environment. Both X-ray diffraction and petrographic analyses indicate that the red sandstones are composed of predominantly K-feldspar and quartz grains and an illite matrix. These are dominantly arkosic wacke. A small amount of hematite (
The Geochemistry And Petrology Of The Ophiolitic Rocks From The Kahramanmaraş Region, Southern Turkey, Utku Bağci
The Geochemistry And Petrology Of The Ophiolitic Rocks From The Kahramanmaraş Region, Southern Turkey, Utku Bağci
Turkish Journal of Earth Sciences
The regionally important dismembered ophiolitic sequence from the southern Kahramanmaraş region, located along the Arabian-Eurasian collision zone in southeastern Turkey, contains harzburgitic tectonites, ultramafic to mafic cumulates, isotropic gabbros and ophiolite-related metamorphic rocks. The ultramafic-mafic cumulate rocks are composed of wehrlite, lherzolite, olivine websterite, olivine gabbronorite, olivine gabbro and gabbro. The crystallization order of the cumulus phases, the presence of high Ca-plagioclase (An_{83-94}), highly magnesian clinopyroxene (Mg#_{78-93}), olivine (Mg#_{71-91}) and their coexistence in the ultramafic-mafic cumulate rocks indicate a suprasubduction zone (SSZ) environment and suggest that the cumulates were derived from an island arc tholeiitic (IAT) magma. The isotropic gabbros …
Low-Sulfidation Epithermal Au-Ag Mineralization In The Sındırgı District, Balıkesir Province, Turkey, Hüseyi̇n Yilmaz, Fatma Nuran Sönmez, Erhan Akay, Ahmet Keri̇m Şener, Seda Tufan
Low-Sulfidation Epithermal Au-Ag Mineralization In The Sındırgı District, Balıkesir Province, Turkey, Hüseyi̇n Yilmaz, Fatma Nuran Sönmez, Erhan Akay, Ahmet Keri̇m Şener, Seda Tufan
Turkish Journal of Earth Sciences
The Sındırgı District (Balıkesir, western Turkey) lies within the Western Anatolian volcanic and extensional province, adjacent to the WNW-trending Simav graben, approximately 130 km NE of İzmir. The Sındırgı mining district is underlain mainly by Miocene volcanic rocks and hosts several low-sulfidation epithermal Au-Ag deposits and prospects located near the towns of Sındırgı and Bigadiç. The Kızıltepe low-sulfidation epithermal gold-silver deposit is located southeast of Yusufçam village (Sındırgı, Balıkesir), and other prospects, including the Kepez, Kavaklıdüz, and Karadüz prospects, are located northeast of Kızıltepe. Potentially economic grades occur at Kızıltepe, which contains a measured and indicated resource of 1.754.790 Mt …
Mineralogical And Physicochemical Properties Of Talc From Emirdağ, Afyonkarahisar, Turkey, Bahri̇ Ersoy, Sedef Di̇kmen, Ahmet Yildiz, Remzi̇ Gören, Ömer Eli̇tok
Mineralogical And Physicochemical Properties Of Talc From Emirdağ, Afyonkarahisar, Turkey, Bahri̇ Ersoy, Sedef Di̇kmen, Ahmet Yildiz, Remzi̇ Gören, Ömer Eli̇tok
Turkish Journal of Earth Sciences
Lens-shaped talc deposits related to Mesozoic gabbroic rocks are exposed in an area of 2 km^2, about 80 km northwest of Afyonkarahisar (western Anatolia). Different alteration zones in talc deposits were determined depending on differences related to the texture and color of the host rock. In order to determine mineralogical, geochemical, and physicochemical features of the Emirdağ talc deposits, X-ray diffractometer, scanning electron microscope (SEM), FT-IR and Mössbauer spectroscopy, differential thermogravimetric analyses, BET-specific surface area, color, water soluble substance, acid-soluble carbonate, and acid-soluble iron tests were performed on the samples collected from different alteration zones in the lateral direction. Four …
Geology And Diagenesis Of A Zeolitic Foça Tuff Unit Deposited In A Miocene Phreatomagmatic Lacustrine Environment (Western Anatolia), Mustafa Albayrak, Abdullah Mete Özgüner
Geology And Diagenesis Of A Zeolitic Foça Tuff Unit Deposited In A Miocene Phreatomagmatic Lacustrine Environment (Western Anatolia), Mustafa Albayrak, Abdullah Mete Özgüner
Turkish Journal of Earth Sciences
This study explains the relations between the depositional environment of a zeolitic tuff unit and its diagenesis. It gives new ideas of the juvenile phreatomagmatic origin of the zeolitic unit with its bentonitic cap rock, and finds that the diagenetic alteration of the volcanic ash deposition in a hot hydrologic system is penecontemporaneous and not epigenetic. A massive, fine-grained zeolitic unit has a sharp contact with the underlying shallow subaqueous rhyolitic dome intrusions and their surrounding volcanoclastic ejecta. Juvenile emanations from the basal subaqueous intrusions activated thorough zeolitic diagenesis within the overlying rhyolitic tuff deposits extending as far as the …
The Mineralogy And Geochemistry Of Neogene Sediments From Eastern Turkey, Southeast Of Arapgir (Malatya), Di̇cle Bal Akkoca, Zeynep Baytaşoğlu
The Mineralogy And Geochemistry Of Neogene Sediments From Eastern Turkey, Southeast Of Arapgir (Malatya), Di̇cle Bal Akkoca, Zeynep Baytaşoğlu
Turkish Journal of Earth Sciences
The mineralogy and geochemistry of volcaniclastic sediments in the southeastern part of the Arapgir area (Malatya) were studied by optical microscopy, XRD, SEM, ICP-AES, and MS techniques. Samples were collected from the marine and lacustrine deposits of the Dibekli and Böğürlüdağ sections that contained calcite, clay minerals, feldspar, quartz, dolomite, and opal. Clay minerals were mixed layer smectite-chlorite, illite, and palygorskite, with Ca-smectite being the dominant clay phase. Smectite was derived from the transformation of volcanic glass and volcanic rock fragments. The fact that Y, Sc, Co and \SigmaREE concentrations and (La/Lu)N, La/Sc, Sc/Th, Co/Th, Th/U, and Zr/Hf ratios of …
Coastal Inundation Due To Sea Level Rise And Extreme Sea State And Its Potential Impacts: Çukurova Delta Case, Özlem Si̇mav, Dursun Zafer Şeker, Cem Gazi̇oğlu
Coastal Inundation Due To Sea Level Rise And Extreme Sea State And Its Potential Impacts: Çukurova Delta Case, Özlem Si̇mav, Dursun Zafer Şeker, Cem Gazi̇oğlu
Turkish Journal of Earth Sciences
With the rising sea level becoming a more pressing issue to coastal areas, a comprehensive analysis has been conducted to assess the vulnerability of the Çukurova Delta under the projected inundation by the end of the century. The level of inundation was estimated from a multimission satellite altimetry sea level anomaly and significant wave height data between September 1992 and February 2012. Superposed to the clear annual oscillation with 6.2 cm amplitude peaking around the beginning of October, the mean sea level signal exhibits a positive trend of 3.4 ± 0.1 mm/year over the altimetric data period. The extreme wave …
Palaeoenvironmental And Chronological Constraints On The Tuğlu Formation (Çankırı Basin, Central Anatolia, Turkey), Ilaria Mazzini, Natalia Hudáková, Peter Joniak, Marianna Kovacova, Tamás Mikes, Andreas Mulch, Fuat Bora Rojay, Stella Lucifora, Daniela Esu, Ingeborg Soulie-Marsche
Palaeoenvironmental And Chronological Constraints On The Tuğlu Formation (Çankırı Basin, Central Anatolia, Turkey), Ilaria Mazzini, Natalia Hudáková, Peter Joniak, Marianna Kovacova, Tamás Mikes, Andreas Mulch, Fuat Bora Rojay, Stella Lucifora, Daniela Esu, Ingeborg Soulie-Marsche
Turkish Journal of Earth Sciences
The Çankırı Basin, located in the northern part of the Central Anatolian Plateau, is a large Tertiary basin where thick Miocene to Quaternary continental sediments overlay the Cretaceous-Tertiary units. This investigation focuses on the Tuğlu Formation, an Upper Miocene succession mainly composed of dark grey silty and organic rich clays. The type section of Tuğlu has been sampled for an array of multidisciplinary analyses. The palaeontological proxies included ostracod, foraminifer, nannoplankton, pollen, molluscs, charophytes, small mammal assemblages, fish, and crab remains. The abiotic parameters studied were: palaeomagnetism and environmental magnetism, stable carbon and oxygen isotope ratios (on ostracods and bulk …
Paleomagnetic Rotations In The Late Miocene Sequence From The Çankırı Basin (Central Anatolia, Turkey): The Role Of Strike-Slip Tectonics, Stella Lucifora, Francesca Cifelli, Fuat Bora Rojay, Massimo Mattei
Paleomagnetic Rotations In The Late Miocene Sequence From The Çankırı Basin (Central Anatolia, Turkey): The Role Of Strike-Slip Tectonics, Stella Lucifora, Francesca Cifelli, Fuat Bora Rojay, Massimo Mattei
Turkish Journal of Earth Sciences
In this paper, new paleomagnetic and anisotropy of magnetic susceptibility (AMS) data from Miocene continental units of the Çankırı Basin are presented, with the main goal of providing additional constraints on its deformational and rotational history during the Late Cenozoic. AMS data indicate a tectonic origin for the magnetic fabric, suggesting that Upper Miocene units were still involved in the deformation processes. Paleomagnetic data show that tectonic rotations in the Çankırı Basin do not show a symmetrical distribution along the opposite edges of the basin, as expected from the observed omega-shape. In particular, by combining our data with those already …
Plio-Quaternary Extensional Tectonics Of The Central Anatolian Plateau: A Case Study From The Tuz Gölü Basin, Turkey, Erman Özsayin, Tahsi̇n Atti̇la Çi̇ner, Fuat Bora Rojay, Ramazan Kadi̇r Di̇ri̇k, Daniel Melnick, David Fernández-Blanco, Giovanni Bertotti, Taylor F. Schildgen, Yannick Garcin, Manfred R. Strecker, Masafumi Sudo
Plio-Quaternary Extensional Tectonics Of The Central Anatolian Plateau: A Case Study From The Tuz Gölü Basin, Turkey, Erman Özsayin, Tahsi̇n Atti̇la Çi̇ner, Fuat Bora Rojay, Ramazan Kadi̇r Di̇ri̇k, Daniel Melnick, David Fernández-Blanco, Giovanni Bertotti, Taylor F. Schildgen, Yannick Garcin, Manfred R. Strecker, Masafumi Sudo
Turkish Journal of Earth Sciences
The Tuz Gölü Basin is the largest sedimentary depression located at the center of the Central Anatolian Plateau, an extensive, low-relief region with elevations of ca. 1 km located between the Pontide and Tauride mountains. Presently, the basin morphology and sedimentation processes are mainly controlled by the extensional Tuz Gölü Fault Zone in the east and the transtensional İnönü-Eskişehir Fault System in the west. The purpose of this study is to contribute to the understanding of the Plio-Quaternary deformation history and to refine the timing of the latest extensional phase of the Tuz Gölü Basin. Field observations, kinematic analyses, interpretations …
Messinian Paleoenvironmental Changes In The Easternmost Mediterranean Basin: Adana Basin, Southern Turkey, Costanza Faranda, Elsa Gliozzi, Paola Cipollari, Francesco Grossi, Güldemi̇n Darbaş, Kemal Gürbüz, Ati̇ke Nazi̇k, Rocco Gennari, Domenico Cosentino
Messinian Paleoenvironmental Changes In The Easternmost Mediterranean Basin: Adana Basin, Southern Turkey, Costanza Faranda, Elsa Gliozzi, Paola Cipollari, Francesco Grossi, Güldemi̇n Darbaş, Kemal Gürbüz, Ati̇ke Nazi̇k, Rocco Gennari, Domenico Cosentino
Turkish Journal of Earth Sciences
We present detailed Messinian paleoenvironmental reconstructions for the Adana Basin based on a multidisciplinary approach that utilizes the fossil content of the Kuzgun and Handere Formations. To reconstruct the paleoenvironmental changes that affected the Adana Basin during the Messinian, we analyzed mollusk, ostracod, planktonic and benthonic foraminifer, and calcareous nannofossil assemblages from 2 stratigraphic sections near Kabasakal village (Adana, southern Turkey). To determine if the environmental changes recognized in the Adana Basin are local or regional, and to understand the extent to which the global changes in oceanic circulation impacted the Mediterranean sedimentary basins, we compare our results with Messinian …
Impact Of Pb-Zn Mining Activity On Surficial Sediments Of Lake Kalimanci(Fyr Macedonia), Petra Vrhovnik, Nastja Rogan Smuc, Tadej Dolenec, Todor Serafimovski, Matej Dolenec
Impact Of Pb-Zn Mining Activity On Surficial Sediments Of Lake Kalimanci(Fyr Macedonia), Petra Vrhovnik, Nastja Rogan Smuc, Tadej Dolenec, Todor Serafimovski, Matej Dolenec
Turkish Journal of Earth Sciences
The activities of the Sasa mine have led to industrial discharge being released into Lake Kalimanci since the beginning of mining activity in 1954. For this reason, an ecological risk assessment is urgently required. In the present study, surficial lake sediments were analyzed using inductively coupled plasma mass spectrometry (ICP-MS), with all geochemistry data processed using Statistica 8. In order to assess the environmental pollution status, 2 environmental factors were established, while for the determination of chemical fractionation of toxic metals a sequential extraction procedure was carried out. Concentrations of As, Mo, Zn, Ni, Co, Pb, Cd, and Cu in …
Occurrences Of Rock-Fulgurites Associated With Steel Pylons Of The Overhead Electric Transmission Line At Tor Zawar, Ziarat District And Jang Tor Ghar, Muslim Bagh, Pakistan, Akhtar Muhammad Kassi, Aimal Khan Kasi, Henrik Friis, Din Muhammad Kakar
Occurrences Of Rock-Fulgurites Associated With Steel Pylons Of The Overhead Electric Transmission Line At Tor Zawar, Ziarat District And Jang Tor Ghar, Muslim Bagh, Pakistan, Akhtar Muhammad Kassi, Aimal Khan Kasi, Henrik Friis, Din Muhammad Kakar
Turkish Journal of Earth Sciences
We here report 3 occurrences of rock fulgurites: 2 at Tor Zawar, Ziarat District, and 1 at Jang Tor Ghar, Muslim Bagh, Pakistan. The first and second melting events occurred at Tor Zawar, Ziarat on 27 January 2010, and sometime during the month of January 2011; the third melting event occurred on 12 February 2011. All these events occurred near the base of steel pylons of electric transmission lines installed on hillside outcrops, which transmitted atmospheric lightning to the outcrop. At Tor Zawar, Ziarat District, the pylons are installed on outcrops of the volcanogenic conglomerate of the Late Cretaceous Bibai …
First 15 Probability-Based Multidimensional Tectonic Discrimination Diagrams For Intermediate Magmas And Their Robustness Against Postemplacement Compositional Changes And Petrogenetic Processes, Surendra Pal Verma, Sanjeet K. Verma
First 15 Probability-Based Multidimensional Tectonic Discrimination Diagrams For Intermediate Magmas And Their Robustness Against Postemplacement Compositional Changes And Petrogenetic Processes, Surendra Pal Verma, Sanjeet K. Verma
Turkish Journal of Earth Sciences
Although for ultrabasic and basic magmas a plethora of tectonomagmatic diagrams have been used, with the exception of one bivariate diagram for refined tectonic setting of orogenic andesites, none is available for highly abundant intermediate magma. We present 3 sets of discrimination diagrams obtained from the correct statistical methodology of loge-ratio transformation and linear discriminant analysis. All major element log_e-ratio variables in 3664 samples, only immobile major and trace element log_e-ratio variables in 1858 samples, and immobile trace element log_e-ratio variables in 1512 samples were used. These diagrams with probability-based tectonic field boundaries and high success rates (about 69%-96%, 63%-100%, …
Investigation Of The Groundwater Effect On Slow-Motion Landslides By Using Dynamic Kalman Filtering Method With Gps: Koyulhisar Town Center, Kemal Özgür Hastaoğlu
Investigation Of The Groundwater Effect On Slow-Motion Landslides By Using Dynamic Kalman Filtering Method With Gps: Koyulhisar Town Center, Kemal Özgür Hastaoğlu
Turkish Journal of Earth Sciences
The monitoring and analysis of natural disasters and their systems is crucially important in minimizing loss of life and property. In recent years, various methods of measurement and analysis have been employed to monitor and analyze landslides and their mechanisms. The Global Positioning System (GPS) is one of the methods used to monitor landslides. The consideration of external forces causing movement is essential when interpreting movement obtained by GPS. This paper describes a large motion in the Koyulhisar town center obtained from one GPS point. Twelve GPS points were set up in the Koyulhisar landslide region; 6 periods of GPS …
On The Surface Circulation Of The Marmara Sea As Deduced From Drifters, Riccardo Gerin, Pierre-Marie Poulain, Şükrü Turan Beşi̇ktepe, Pietro Zanasca
On The Surface Circulation Of The Marmara Sea As Deduced From Drifters, Riccardo Gerin, Pierre-Marie Poulain, Şükrü Turan Beşi̇ktepe, Pietro Zanasca
Turkish Journal of Earth Sciences
The surface circulation of the Marmara Sea was studied with satellite-tracked drifters during 2 field experiments. A total of 29 drifters were released in September 2008 and February 2009 at key locations south of the Bosphorus and in the central part of the sea. The spatial structures and temporal variability are described together with the atmospheric conditions of the Marmara Sea during the period of study. The behavior of drifters with respect to the wind was qualitatively analyzed. The pseudo-Eulerian velocity statistics were computed from the interpolated positions and maps of the mean currents were produced using the data sorted …
Computation Of Grade Values Of Sediment-Hosted Barite Deposits In Northeastern Isparta (Western Turkey), Numan Elmas, Uğur Şahi̇n
Computation Of Grade Values Of Sediment-Hosted Barite Deposits In Northeastern Isparta (Western Turkey), Numan Elmas, Uğur Şahi̇n
Turkish Journal of Earth Sciences
Grade value is a crucial parameter for the mineral industry. Investigation of grade value of mineral resources provides the optimum benefit. In this study, an adaptive neuro-fuzzy inference system (ANFIS) and artificial neural network (ANN) model were applied for the prediction of grade values. The spatial coordinates X, Y, and Z of the study area along with bore hole geochemical data were used as input variables in the model. In order to illustrate the applicability and capability of these methods, the western part of Turkey, between the latitudes 38°01 45 N and 38°09 52 N and between the longitudes 31°23 …
Circum-Tethyan Carbonate Platform Evolution During The Palaeogene: The Prebetic Platform As A Test For Climatically Controlled Facies Shifts, Stefan Höntzsch, Christian Scheibner, Johannes P. Brock, Jochen Kuss
Circum-Tethyan Carbonate Platform Evolution During The Palaeogene: The Prebetic Platform As A Test For Climatically Controlled Facies Shifts, Stefan Höntzsch, Christian Scheibner, Johannes P. Brock, Jochen Kuss
Turkish Journal of Earth Sciences
The distribution of selected shallow-benthic biota at circum-Tethyan carbonate platforms demonstrates an excellent proxy for the impact of latitudinally controlled cooling and variations in the trophic resources during the Palaeogene. In this study, we link and compare the spatial distribution and abundance of larger benthic foraminifera and hermatypic corals of Tethyan carbonate successions with new records from the Prebetic platform in SE Spain. The succession of the Prebetic platform is dominated by larger benthic foraminifera and coralline red algae throughout the Eocene, whereas corals were not recorded until the Late Eocene. Similar biotic trends were reported from 10 selected circum-Tethyan …
Magmatic Processes At The Volcanic Front Of Central Mexican Volcanic Belt: Sierra De Chichinautzin Volcanic Field (Mexico), Fernando Velasco-Tapia, Surendra Pal Verma
Magmatic Processes At The Volcanic Front Of Central Mexican Volcanic Belt: Sierra De Chichinautzin Volcanic Field (Mexico), Fernando Velasco-Tapia, Surendra Pal Verma
Turkish Journal of Earth Sciences
The Sierra de Chichinautzin (SCN) volcanic field is considered one of the key areas to understand the complex petrogenetic processes at the volcanic front of the Mexican Volcanic Belt (MVB). New as well as published major- and trace-element and Sr and Nd isotopic data are used to constrain the magma generation and evolution processes in the SCN. From inverse and direct modelling, combined ^{87}Sr/^{86}Sr and ^{143}Nd/^{144}Nd data, and use of multi-dimensional log-ratio discriminant function based diagrams and other geological and geophysical considerations, we infer that mafic magmas from the SCN were generated by partial melting of continental lithospheric mantle in …
Prediction Of Weathering Development In Metarhyolites Of The Ilgın (Konya) Area, Sw Turkey, Erkan Bozkurtoğlu, Şenel Özdamar, Hati̇ce Ünal Ercan
Prediction Of Weathering Development In Metarhyolites Of The Ilgın (Konya) Area, Sw Turkey, Erkan Bozkurtoğlu, Şenel Özdamar, Hati̇ce Ünal Ercan
Turkish Journal of Earth Sciences
Fresh to weathered metarhyolites crop out in the Ilgın (Konya) area of the Afyon-Bolkardağ Zone. Determination of the development of weathering was studied by physical (i.e. specific gravity, dry unit weight, saturated unit weight, porosity, void ratio, and degree of saturation by weight) and mechanical (i.e. point load) properties and the \"point rock change value\" (RCV_p) and \"point rock change ratio\" (RCR_p) values of the metarhyolite rock samples. The samples were classified in 3 groups (i.e. A, B, and C) representing degree of weathering from weathered to fresh rocks based on their RCV_p and RCR_p values. The K_2O values are …
The Effects Of Linear Coarse-Grained Slope Channel Bodies On The Orientations Of Fold Developments: A Case Study From The Middle Eocene-Lower Oligocene Kırkgeçit Formation, Elazığ, Eastern Turkey, Hasan Çeli̇k
Turkish Journal of Earth Sciences
A significant magnitude of tectonic feature deflection away from the principal stress direction was investigated. This was caused by oblique spatial orientation of coarse-grained sediment bodies, principally large conglomerate and sand-filled deep-water slope channels, in an otherwise mud-rich sedimentary section. After detailed mapping and field work to find the cause of this localised fold axis deflection, superbly exposed conglomerate and sand filled deep-water slope channel bodies were found both in and/or next to the core of the folds with the same spatial orientation as the folds. It was concluded that the channel bodies are effectively dictating the orientations of the …
Stress Features In Terra Rossa Soil Under Traditional Olive Cultivation: A Micromorphological And Mineralogical Characterization, Salvatore Madrau, Claudio Zucca, İhsan Akşi̇t, Valeria Fiori
Stress Features In Terra Rossa Soil Under Traditional Olive Cultivation: A Micromorphological And Mineralogical Characterization, Salvatore Madrau, Claudio Zucca, İhsan Akşi̇t, Valeria Fiori
Turkish Journal of Earth Sciences
This study analyzes the micromorphological and mineralogical properties of a Terra Rossa soil under a traditional Mediterranean olive grove. It highlights the microscopic and sub-microscopic features generated by the permanent crop cover. The study area, where the land use has remained unchanged for the last 150 years, is near Sassari (Sardinia, Italy) and is characterized by dominant Terra Rossa developed on Miocene marine limestone. Two soil profiles were opened and described in July 2009, 1 under the canopy of an olive tree and 1 between the trees. Chemical and physical analyses were carried out. Undisturbed aggregates were collected from all …
Clay Mineralogy Of Red Clay Deposits From The Central Carpathian Basin (Hungary): Implications For Plio-Pleistocene Chemical Weathering And Palaeoclimate, János Kovács, Béla Raucsik, Andrea Varga, Gabor Ujvari, György Varga, Franz Ottner
Clay Mineralogy Of Red Clay Deposits From The Central Carpathian Basin (Hungary): Implications For Plio-Pleistocene Chemical Weathering And Palaeoclimate, János Kovács, Béla Raucsik, Andrea Varga, Gabor Ujvari, György Varga, Franz Ottner
Turkish Journal of Earth Sciences
Geochemical and mineralogical studies of palaeosols provide essential information for palaeoclimatic and palaeoenvironmental interpretation of continental deposits and can present a proxy for palaeoclimate. Red clays in the central Carpathian Basin (Hungary) (Tengelic Red Clay Formation; Kerecsend Red Clay Formation), overlain by loess-palaeosol sequences, were studied. Results from geochemical climofunctions applied to Upper Pliocene–Lower Pleistocene red clays and palaeosols located in the Carpathian Basin, and clay mineralogy, indicate that the palaeoclimate was considerably more humid and warmer during the Late Pliocene-Early Pleistocene in comparison to modern values.
Multi-Proxy Evidences Of Mid-Pleistocene Dry Climates Observed On Calcretes In Central Turkey, Ceren Küçükuysal, Asuman Günal Türkmenoğlu, Seli̇m Kapur
Multi-Proxy Evidences Of Mid-Pleistocene Dry Climates Observed On Calcretes In Central Turkey, Ceren Küçükuysal, Asuman Günal Türkmenoğlu, Seli̇m Kapur
Turkish Journal of Earth Sciences
Palaeosols are very important in reconstructing palaeoclimate studies, since they are accepted as useful climate markers and as potential providers of proxy data. The study of the palaeosols of the Plio-Pleistocene rock sequences around Ankara revealed evidence for a reconstruction of the Quaternary palaeoclimate of the region. The study area is located in Bala, south-east of Ankara, which contains Middle Pleistocene red palaeosols with powdery to nodular calcrete developments, alternating with channel deposits. During this warm and arid period in the Pleistocene, the limited water available in the soil led to the accumulation of low magnesian carbonates, forming calcretes. The …
Geology Of Late Miocene Clayey Sediments And Distribution Of Palaeosol Clay Minerals In The North-Eastern Part Of The Cappadocian Volcanic Province (Araplı-Erdemli), Central Anatolia, Turkey, Selahatti̇n Kadi̇r, Ali̇ Gürel, Hülya Senem, Taci̇t Külah
Geology Of Late Miocene Clayey Sediments And Distribution Of Palaeosol Clay Minerals In The North-Eastern Part Of The Cappadocian Volcanic Province (Araplı-Erdemli), Central Anatolia, Turkey, Selahatti̇n Kadi̇r, Ali̇ Gürel, Hülya Senem, Taci̇t Külah
Turkish Journal of Earth Sciences
The study area is situated in the Araplı-Erdemli (Kayseri) area in the north-eastern part of the Cappadocian Volcanic Province (CVP), central Anatolia. The Late Miocene series comprises lacustrine and fluvial deposits interbedded with ignimbrites and lava flows. The Late Miocene Mustafapaşa member of the Ürgüp Formation comprises yellow to red mudstone that alternates with thin sandstone beds in the north-eastern part of the CVP. This unit continues upward through the Cemilköy ignimbrite palaeosol layers (comprising altered Cemilköy ignimbrite, vertisol and well-developed palaeosol layers), the Gördeles ignimbrite and red palaeosol layers, and includes two fallout levels; it is overlain by the …
The Upper Cretaceous Calciclastic Submarine Fan Deposits In The Eastern Pontides, Ne Turkey: Facies Architecture And Controlling Factors, Di̇lek Sofracioğlu, Rai̇f Kandemi̇r
The Upper Cretaceous Calciclastic Submarine Fan Deposits In The Eastern Pontides, Ne Turkey: Facies Architecture And Controlling Factors, Di̇lek Sofracioğlu, Rai̇f Kandemi̇r
Turkish Journal of Earth Sciences
The Tonya Formation, which represents the uppermost part of the Mesozoic sequence in the Eastern Pontides, consists of calciturbidites in Trabzon and its surrounding region. Two stratigraphic sections of the unit were measured in the Hacımehmet and Gürbulak areas to decipher the distribution of rock types, facies architecture, sediment textures and depositional environment. The grain size, channels, suprafan lobes and slump structures of the sediments suggest that calciclastic sequences were deposited in a submarine fan system. Calcarenites/calcirudites and hemipelagic rocks, comprising an alternation of marls and mudstones, are the two dominant lithologies described in the studied calciclastic submarine fan system. …
Three-Dimensional Subsurface Modeling Of Mineralization: A Case Study From The Handeresi (Çanakkale, Nw Turkey) Pb-Zn-Cu Deposit, Si̇nan Akiska, İbrahi̇m Sönmez Sayili, Gökhan Demi̇rela
Three-Dimensional Subsurface Modeling Of Mineralization: A Case Study From The Handeresi (Çanakkale, Nw Turkey) Pb-Zn-Cu Deposit, Si̇nan Akiska, İbrahi̇m Sönmez Sayili, Gökhan Demi̇rela
Turkish Journal of Earth Sciences
The main goal of 3D modeling studies in the mining sector is to address the complex geological, mineralogical, and structural factors in subsurface environments and detect the ore zone(s). In order to solve this complexity, use of quality data (e.g., a wide range of boreholes at regular intervals) is necessary. However, this situation is not always possible because of certain restrictions such as intensive vegetation, high slope areas, and some economic constraints. At the same time, with the development of computer technology, the unused and/or insufficiently considered data need to be gathered and reviewed. This assessment may lead to the …
A Method Based On The Van Der Hoven Spectrum For Performance Evaluation In Prediction Of Wind Speed, Eli̇f Kaya, Burak Barutçu, Şükran Si̇bel Menteş
A Method Based On The Van Der Hoven Spectrum For Performance Evaluation In Prediction Of Wind Speed, Eli̇f Kaya, Burak Barutçu, Şükran Si̇bel Menteş
Turkish Journal of Earth Sciences
Development of techniques for accurate assessment of wind power potential at a site is very important for the planning and establishment of a wind energy system. The most important defining character of the wind and the problems related with it lie in its unpredictable variation. Van der Hoven constructed a wind speed spectrum using short-term and long-term records of wind in Brookhaven, NY, USA, in 1957 and showed the diurnal and turbulent effects. His spectrum suggests that there is a substantial amount of wind energy in 1-min periodic variations. The aim of this paper is to evaluate the results of …