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Articles 1 - 30 of 55
Full-Text Articles in Physical Sciences and Mathematics
Stable Isotope-Based Reconstruction Of Oligo-Miocene Paleoenvironment And Paleohydrology Of Central Anatolian Lake Basins (Turkey), Tina Lüdecke, Tamás Mikes, Fuat Bora Rojay, Michael A. Cosca, Andreas Mulch
Stable Isotope-Based Reconstruction Of Oligo-Miocene Paleoenvironment And Paleohydrology Of Central Anatolian Lake Basins (Turkey), Tina Lüdecke, Tamás Mikes, Fuat Bora Rojay, Michael A. Cosca, Andreas Mulch
Turkish Journal of Earth Sciences
Isotope geochemistry of lacustrine carbonate represents a powerful tool to reconstruct paleoclimatic and paleoenvironmental conditions. Here, we present a comprehensive set of long-term oxygen (delta^{18}O) and carbon (delta^{13}C) stable isotope records from 5 Chattian to Burdigalian lacustrine sequences distributed over the Central Anatolian Plateau. Field relationships combined with stable isotope geochemistry indicate a relatively humid subtropic Late Oligocene climate with an environment characterized by large, temporally open freshwater lakes. Approximately during the middle Aquitanian, a 4%o-5%o increase in lake delta^{18}O values indicates changes in regional climate including more arid conditions and an increasing dominance of closed saline lake conditions in …
Cenozoic Tectonics Of The Tuz Gölü Basin (Central Anatolian Plateau, Turkey), David Fernández-Blanco, Giovanni Bertotti, Tahsi̇n Atti̇la Çi̇ner
Cenozoic Tectonics Of The Tuz Gölü Basin (Central Anatolian Plateau, Turkey), David Fernández-Blanco, Giovanni Bertotti, Tahsi̇n Atti̇la Çi̇ner
Turkish Journal of Earth Sciences
We present a new 3D geologic model for the architecture and Cenozoic tectonic evolution of the Tuz Gölü Basin, a major sedimentary basin in the Central Anatolian orogenic plateau. This model is grounded on 7 depth-converted seismic reflection profiles in combination with the analysis of backstripped subsidence curves, isochore maps, and a palinspastically restored cross-section. Two stages of basin formation are detected during Cenozoic times. During the Palaeogene, around 2 km of basement subsidence led to the development of a sag basin broader than the present basin in the absence of bounding faults. After a period of uplift and erosion, …
Middle-Upper Miocene Paleogeography Of Southern Turkey: Insights From Stratigraphy And Calcareous Nannofossil Biochronology Of The Olukpınar And Başyayla Sections (Mut-Ermenek Basin), Paola Cipollari, Eva Halásová, Kemal Gürbüz, Domenico Cosentino
Middle-Upper Miocene Paleogeography Of Southern Turkey: Insights From Stratigraphy And Calcareous Nannofossil Biochronology Of The Olukpınar And Başyayla Sections (Mut-Ermenek Basin), Paola Cipollari, Eva Halásová, Kemal Gürbüz, Domenico Cosentino
Turkish Journal of Earth Sciences
The age of the marine succession capping the basement rocks of the central Taurides in the Mut-Ermenek Basin is constrained using calcareous nannofossil biochronology. The Olukpınar section, which correlates with the biozones between MNN5a and MNN6b (late Langhian-late Serravallian), represents a deeper marine environment developed lateral to the Ermenek platform. The long-term transgressive-regressive cycle of the Olukpınar section, which corresponds to the middle-upper part of the TB2 supercycle, can be subdivided into 2 large-scale (10^6 years) cycles (TB2.4 and TB2.5) based on the occurrence of 2 major debris flow deposits linked to sea-level drop. The younger late Tortonian Başyayla section …
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 …
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 …
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 …
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 …
Emerging Multi-Proxy Records Of Late Quaternary Palaeoclimate Dynamics In Turkey And The Surrounding Region, Kathleen Nicoll, Ceren Küçükuysal
Emerging Multi-Proxy Records Of Late Quaternary Palaeoclimate Dynamics In Turkey And The Surrounding Region, Kathleen Nicoll, Ceren Küçükuysal
Turkish Journal of Earth Sciences
We present an overview of selected papers published since 2000 that interpret Late Quaternary multi-proxy palaeoclimate records from Turkey and the surrounding region of the Near-Middle East and Mediterranean region. Existing records in Turkey are rather limited in their resolution, and the locations studied thus far reflect a limited spatial and temporal distribution. Because Turkey is a very large country with numerous mountains that affect local weather conditions and create complex feedbacks, it is difficult to correlate trends across the broad landscape, and beyond. Published instrumental records are too short, and most palaeoclimate proxy records, including many lakes studied in …
The U-Pb Age, Geochemistry And Tectonic Significance Of Granitoids In The Soursat Complex, Northwest Iran, Mahboobeh Jamshidi Badr, Alan S. Collins, Fariborz Masoudi, Grant Cox, Mohammad Mohajjel
The U-Pb Age, Geochemistry And Tectonic Significance Of Granitoids In The Soursat Complex, Northwest Iran, Mahboobeh Jamshidi Badr, Alan S. Collins, Fariborz Masoudi, Grant Cox, Mohammad Mohajjel
Turkish Journal of Earth Sciences
The Soursat Complex in northwestern of Iran is part of the Sanandaj-Sirjan metamorphic belt. Three granitoid suites are present: Type I- syenogranite and deformed syenogranite; Type II- Turkeh Dare and Pichagchi plutons; and Type III- quartz porphyry. The granites can be assigned to a medium-K calc-alkaline to high-K calc-alkaline series. The Type I granitoids are weakly to strongly peraluminous and belong to a S-type suite, whereas Type II plutons are metaluminous to weakly peraluminous with I-type character. Type III granitoids are weakly peraluminous and can be labelled as a highly fractionated I-type suite. U/Pb zircon dating of the syenogranite and …
Petromodeler (Petrological Modeler): A Microsoft® Excel© Spreadsheet Program For Modelling Melting, Mixing, Crystallization And Assimilation Processes In Magmatic Systems, Emrah Yalçin Ersoy
Petromodeler (Petrological Modeler): A Microsoft® Excel© Spreadsheet Program For Modelling Melting, Mixing, Crystallization And Assimilation Processes In Magmatic Systems, Emrah Yalçin Ersoy
Turkish Journal of Earth Sciences
PETROMODELER (Petrologic Modeler) is a Microsoft® Excel© spreadsheet program which numerically and graphically models magmatic processes including melting, crystallization, assimilation and mixing by using trace elements and isotopic ratios. Melting models include (a) batch, (b) dynamic (continuous) and (c) fractional melting for (1) instantaneous and (2) cumulate melts, (3) residual solid and (4) total residue. These models can also be used to treat modal and non-modal melting. Crystallization processes modelled in the program include: (1) perfect equilibrium and (2) perfect fractional crystallization (PEC and PFC), (3) equilibrium crystallization-imperfect fractional crystallization (EC-IFC), (4) zoned crystallization-imperfect fractional crystallization (ZC-IFC), and (5) combined …
Late Maastrichtian-Late Palaeocene Planktic Foraminiferal Biostratigraphy Of The Matrix Of The Bornova Flysch Zone Around Bornova (İzmir, Western Anatolia, Turkey), Bi̇lal Sari
Turkish Journal of Earth Sciences
The Bornova Flysch Zone (BFZ), located between the Menderes Massif and the İzmir-Ankara Suture in westernmost Anatolia (Turkey), forms the westernmost part of the Anatolide-Taurides. The BFZ comprises intensely sheared Upper Cretaceous-Palaeocene matrix and blocks of various origins. The matrix of the BFZ is mainly made up of unfossiliferous flysch-type sediments (alternations of sandstones and shales). In Bornova (İzmir, western Turkey) and its surroundings, these clastics locally include planktic foraminifera-bearing pelagic micritic limestone and calcareous shale lenses and interbeds (Beytitepe Limestone). As a result of studies focusing on the planktic foraminifera-bearing pelagic interlayers in three areas (Gökdere, Işıklar and Kocaçay …
The Efficacy Of Travertine As A Palaeoenvironmental Indicator: Palaeomagnetic Study Of Neotectonic Examples From Denizli, Turkey, Beki̇r Levent Mesci̇, Orhan Tatar, John D. A. Piper, Hali̇l Gürsoy, Erhan Altunel, Stephen Crowley
The Efficacy Of Travertine As A Palaeoenvironmental Indicator: Palaeomagnetic Study Of Neotectonic Examples From Denizli, Turkey, Beki̇r Levent Mesci̇, Orhan Tatar, John D. A. Piper, Hali̇l Gürsoy, Erhan Altunel, Stephen Crowley
Turkish Journal of Earth Sciences
This study has aimed to evaluate whether a discernible environmental signature is recorded in tectonic travertine by applying palaeomagnetic study to examples from the Denizli region in western Turkey. Palaeomagnetic sampling in 7 quarry exposures through short stratigraphic intervals of bedded travertine has determined variations in magnetic susceptibility and palaeofield direction; the former is a potential proxy of climatically-controlled atmospheric dust input and the latter is a possible indicator of directional changes resulting from geomagnetic secular variation of the ancient magnetic field and hence a measure of the rate of travertine accretion. Most sites record normal polarity as predicted from …
Tectonosedimentary Development And Palaeoenvironmental Changes In The Acıgöl Shallow-Perennial Playa-Lake Basin, Sw Anatolia, Turkey, Cahi̇t Helvaci, Mehmet Ci̇hat Alçi̇çek, İbrahi̇m Gündoğan, Ünsal Gemi̇ci̇
Tectonosedimentary Development And Palaeoenvironmental Changes In The Acıgöl Shallow-Perennial Playa-Lake Basin, Sw Anatolia, Turkey, Cahi̇t Helvaci, Mehmet Ci̇hat Alçi̇çek, İbrahi̇m Gündoğan, Ünsal Gemi̇ci̇
Turkish Journal of Earth Sciences
The late Cenozoic extensional deformation formed several NE-trending fluvio-lacustrine basins in SW Anatolia, filled by alluvial, fluvial and lacustrine deposits. Among them, the Acıgöl basin , is notable for its tectono-sedimentary development of a prominent shallow-perennial playa-lake setting. The basin initially subsided to receive coarse-clastic alluvial deposits, merging into fluvial systems and central shallow lakes. Subsequent basin deepening with significant sediment supply from surrounding basement horsts caused gradual shrinkage of the relatively small shallow lakes, due to renewed progradation of alluvial fans and they eventually dried out completely. The sedimentation pattern and palaeoenvironmental changes record a constant tectonic, sedimentation, climatic …
Microfacies Correlation Analysis Of The Oligocene-Miocene Asmari Formation, In The Central Part Of The Rag-E-Safid Anticlinal Oil Field, Zagros Basin, South-West Iran, Mahnaz Amirshahkarami
Microfacies Correlation Analysis Of The Oligocene-Miocene Asmari Formation, In The Central Part Of The Rag-E-Safid Anticlinal Oil Field, Zagros Basin, South-West Iran, Mahnaz Amirshahkarami
Turkish Journal of Earth Sciences
The Oligocene-Miocene Asmari Formation was deposited in a carbonate ramp setting at the margin of the Zagros Basin in south-western Iran. The subsurface sedimentary successions of the Asmari Formation have been studied using cores from the Rag-e-Safid oil field, in order to determinate their microfacies and sedimentary palaeoenvironments. Based on texture analysis and faunal assemblages, 10 microfacies types have been recognised and interpreted. They indicate different depositional settings: open marine, oolitic and bioclastic shoal, lagoon, tidal flat and beach. The microfacies have been interpreted as indicative of the inner and middle ramp. In accordance with the temporal and spatial correlation …
Revised Late Campanian-Danian Age Of The Melange-Related Turbiditic Sequence In The Mersin Area (Central Taurides, S. Turkey), Hayati̇ Koç, Kemal Tasli, Erol Özer
Revised Late Campanian-Danian Age Of The Melange-Related Turbiditic Sequence In The Mersin Area (Central Taurides, S. Turkey), Hayati̇ Koç, Kemal Tasli, Erol Özer
Turkish Journal of Earth Sciences
A planktonic foraminiferal assemblage obtained from the Yavca stratigraphic section north of Mersin shows that the age of a melange-related turbiditic sequence extends to the Danian (Early Palaeocene). Previously, this turbiditic sequence, termed the Yavca Formation, was considered to be of Late Cretaceous or Campanian-Maastrichtian age. The formation is either depositionally overlain by the Fındıkpınarı ophiolite-related melange or tectonically by Mersin Ophiolite slices or Jurassic-Cretaceous platform carbonates. Clayey limestone and mudstone samples collected from the type area of the Yavca Formation yielded planktonic foraminiferal assemblages, which include Parasubbotina pseudobulloides (Plummer), P. varianta (Subbotina), Praemurica pseudoinconstans (Blow), P. inconstans (Subbotina), Globanomalina …
Fluctuations Of Sea Water Temperature Based On Nannofloral Changes During The Middle To Late Miocene, Adana Basin, Turkey, Manolya Sinaci
Fluctuations Of Sea Water Temperature Based On Nannofloral Changes During The Middle To Late Miocene, Adana Basin, Turkey, Manolya Sinaci
Turkish Journal of Earth Sciences
Some nannoplankton species are sensitive to water temperatures. While Coccolithus pelagicus and Reticulofenestra gelida indicate cooler water conditions, the genera Discoaster and Sphenolithus and Calcidiscus leptoporus are indicative of warmer water environments. This paper focuses on relative fluctuation of sea water temperatures during the Middle and Late Miocene, emphasised by cold and warm nannofossil changes in abundance in 2 wells. At the A-1 well in the Middle Miocene, the total abundance of cooler water species is 45%, while that of the warmer species is 3%. During the Late Miocene, the total abundance for cooler water species decreases to 34%; 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 …
Coeval Shoshonitic-Ultrapotassic Dyke Emplacements Within The Kestanbol Pluton, Ezine – Biga Peninsula (Nw Anatolia), Cüneyt Akal
Coeval Shoshonitic-Ultrapotassic Dyke Emplacements Within The Kestanbol Pluton, Ezine – Biga Peninsula (Nw Anatolia), Cüneyt Akal
Turkish Journal of Earth Sciences
The Biga Peninsula, in the north-western part of Western Anatolia, is part of the Sakarya Zone of the Western Pontides and the tectonically overlying Ezine group. The basement rocks are intruded by the early Miocene Kestanbol Pluton and early to middle Miocene calc-alkaline to shoshonitic-ultrapotassic volcanic successions related to postcollisional continental extension. The Kestanbol Pluton mainly comprises monzonite and granodiorite and is cut by shoshonitic-ultrapotassic tephriphonolite dykes. ^{40}Ar-^{39}Ar ages of biotite (21.22 ± 0.09 Ma) and leucite (22.21 ± 0.07 Ma) crystals indicate that tephriphonolite dyke emplacement was coeval with the intrusion of the Kestanbol Pluton during the early Miocene …
Tragulidae (Artiodactyla, Ruminantia) From The Middle Miocene Chinji Formation Of Pakistan, Muhammad Akbar Khan, Muhammad Akhtar
Tragulidae (Artiodactyla, Ruminantia) From The Middle Miocene Chinji Formation Of Pakistan, Muhammad Akbar Khan, Muhammad Akhtar
Turkish Journal of Earth Sciences
The fossil record of the Siwalik tragulids remains poorly documented. The study of the tragulid material from the Chinji Formation allows the identification of 3 species: Dorcatherium minus, Dorcatherium majus and Dorcabune anthracotherioides. The tragulid assemblage is quite rich and Dorcatherium is the predominant taxon in the Chinji Formation of Pakistan. The fossils from the Chinji Formation of the Chakwal district, northern Pakistan, may document the first appearance of the 3 tragulid species in the Lower Siwaliks. The selenodonty and palaeoecology of the Siwalik tragulids are also discussed.
Comment On "Al-In-Hornblende Thermobarometry And Sr-Nd-O-Pb Isotopic Compositions Of The Early Miocene Alaçam Granite In Nw Anatolia (Turkey)", Si̇bel Tatar Erkül, Fuat Erkül
Comment On "Al-In-Hornblende Thermobarometry And Sr-Nd-O-Pb Isotopic Compositions Of The Early Miocene Alaçam Granite In Nw Anatolia (Turkey)", Si̇bel Tatar Erkül, Fuat Erkül
Turkish Journal of Earth Sciences
No abstract provided.
Revisiting The Genesis Of Red Mediterranean Soils, Nicolas Fedoroff, Marie-Agnes Courty
Revisiting The Genesis Of Red Mediterranean Soils, Nicolas Fedoroff, Marie-Agnes Courty
Turkish Journal of Earth Sciences
This work, aside from being a classical discussion on the processes of rubefaction and illuviation, is an attempt to cross the abundant literature on red Mediterranean soils (RMSs) written by pedologists, and also by paleopedologists and geologists, with the climatic frame established by paleoclimatologists for the Quaternary. Such an approach leads us to consider that the development of the RMSs was discontinuous, occurring during periods of environmental stability, i.e. interglacials, characterized by a humid climate (precipitations exceeding evapotranspiration) with dry and hot summers. The impact of glacial intervals on the RMS covers is presently only partially documented. Aeolian processes during …
Late Holocene Climatic Oscillations Traced By Clay Mineral Assemblages And Other Palaeoceanographic Proxies In Ria De Vigo (Nw Spain), Virginia Martins, Fernando Rocha, Cristina Sequeira, Paula Martins, José Santos, Joao Alveirinho Dias, Olivier Weber, Jean-Marie Jouanneau, Belén Rubio, Daniel Rey, Ana Bernabeu, Eduardo Silva, Lázaro Laut, Rubens Figueira
Late Holocene Climatic Oscillations Traced By Clay Mineral Assemblages And Other Palaeoceanographic Proxies In Ria De Vigo (Nw Spain), Virginia Martins, Fernando Rocha, Cristina Sequeira, Paula Martins, José Santos, Joao Alveirinho Dias, Olivier Weber, Jean-Marie Jouanneau, Belén Rubio, Daniel Rey, Ana Bernabeu, Eduardo Silva, Lázaro Laut, Rubens Figueira
Turkish Journal of Earth Sciences
This work aims to study recent climatic oscillations and their influence on sedimentation in the Ria de Vigo, a coastal embayment in Galicia, NW Spain. It is based on the study of clay mineral assemblages, in conjunction with other proxies (granulometric, geochemical, geochronological and microfaunal), in the core KSGX 24. A Benthic Foraminifera High Productivity (BFHP) proxy was used to determine changes in the flux of organic matter (OM) at the bottom of the study area. Total organic carbon (TOC) content is not a suitable proxy to estimate changes in the past supply of OM due to diagenetic processes. The …
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.
The Key Role Of Micromorphology In Studies Of The Genesis Of Clay Minerals And Their Associations In Soils And Its Relevance To Advances In The Philosophy Of Soil Science, Gordon Jock Churchman
The Key Role Of Micromorphology In Studies Of The Genesis Of Clay Minerals And Their Associations In Soils And Its Relevance To Advances In The Philosophy Of Soil Science, Gordon Jock Churchman
Turkish Journal of Earth Sciences
Micromorphological observations from 3 different published works have been studied to aid understanding of aggregation and of colloids, both unique to soils. Saprolites in Hong Kong included ‘veins’ of different thicknesses and colours. Optical mineralogy identified them as infill from the neogenesis of clays in rock fractures. The common thicker infills resulted from weathering. Dark infill contained comminuted primary minerals whereas thin pale infill originated hydrothermally. Scanning electron microscopy (SEM) showed that the size, shape, and mineralogy of the kaolin minerals formed in infill depended on the types of cracks in the saprolites and on drying. Energy-dispersive X-ray spectroscopy analyses …
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 …
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 …
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 …
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 (