Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Turkey (8)
- Geochemistry (3)
- Mineralogy (3)
- Miocene (3)
- Palaeoclimate (3)
-
- Palaeosol (3)
- Adana Basin (2)
- Biga Peninsula (2)
- Cenozoic (2)
- Central Anatolia (2)
- Central Anatolian Plateau (2)
- Hydrothermal alteration (2)
- Kaolinite (2)
- Larger benthic foraminifera (2)
- Palaeomagnetism (2)
- Southern Turkey (2)
- Stable isotopes (2)
- Abrupt hydroclimatic variation (1)
- Acıgöl (1)
- Adaptive neuro-fuzzy inference system (1)
- Afyonkarahisar (1)
- Aggregate stability (1)
- Aggregates (1)
- Alkaline (1)
- Analytic hierarchy process (AHP) (1)
- And geochemistry. (1)
- Ankara (1)
- Anzer (1)
- Arc (1)
- Arid climate (1)
Articles 1 - 30 of 55
Full-Text Articles in Physical Sciences and Mathematics
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 …
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 …
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 …
Genesis Of Sedimentary- And Vein-Type Magnesite Deposits At Kop Mountain, Ne Turkey, Selahatti̇n Kadi̇r, Hasan Kolayli, Muhsi̇n Eren
Genesis Of Sedimentary- And Vein-Type Magnesite Deposits At Kop Mountain, Ne Turkey, Selahatti̇n Kadi̇r, Hasan Kolayli, Muhsi̇n Eren
Turkish Journal of Earth Sciences
Sedimentary- and vein-type magnesites were deposited within and on ultramafic rocks of the Kop Mountain region in Bayburt province. In the field, magnesites are exposed along NE-SW trending normal faults and in fractures in the ultramafic rocks. Petrographic studies reveal that magnesite is predominantly micrite, but also occurs as microsparite formed by recrystallization of micrite. The ultramafic rocks hosting the magnesites consist of serpentinized olivine, hypersthene and diopside. Ni, Co and Ti contents of magnesites suggest precipitation from percolating water through the serpentinized ultramafic rocks. The sedimentary- and vein-type magnesites have different \delta^{18}O and \delta^{13}C values, characterizing formation under different …
Oligocene Vegetation And Climate Characteristics In North-West Turkey: Data From The South-Western Part Of The Thrace Basin, Funda Akgün, Mehmet Serkan Akki̇raz, Sari̇ye Duygu Üçbaş, Mustafa Bozcu, Sevi̇nç Kapan, Ayşe Bozcu
Oligocene Vegetation And Climate Characteristics In North-West Turkey: Data From The South-Western Part Of The Thrace Basin, Funda Akgün, Mehmet Serkan Akki̇raz, Sari̇ye Duygu Üçbaş, Mustafa Bozcu, Sevi̇nç Kapan, Ayşe Bozcu
Turkish Journal of Earth Sciences
In this paper we present the first palynomorph and mollusc assemblages from the sediments in three different sections. From east to west, these are the Şevketiye (northern Biga Peninsula), the Tayfur (Gelibolu Peninsula) and the Kuzu harbour (Gökçeada) (parts of the Danişmen Formation) sections in the south and south-western side of the Thrace Basin (north-west Turkey), with the aim of obtaining information about the composition and structure of vegetation and climate during the Oligocene. The stratigraphic interval extends from late Rupelian to Chattian. The Danişmen Formation in the Şevketiye section yielded a palynomorph association with abundant coastal palms (Arecaceae; Lepidocaryoidae), …
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.
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 …
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 …
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 …
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 (
Preliminary Geoelectrical Identification Of A Low-Temperature Hydrothermal System In The Anzer Glacial Valley, İkizdere, Rize, Turkey, Abdullah Karaman
Preliminary Geoelectrical Identification Of A Low-Temperature Hydrothermal System In The Anzer Glacial Valley, İkizdere, Rize, Turkey, Abdullah Karaman
Turkish Journal of Earth Sciences
The Anzer glacial valley, at an elevation of over 2300 m in the Eastern Black Sea region of Turkey, exhibits evidence for a low-temperature hydrothermal system (40-100 °C). Low-temperature hydrothermal systems usually do not receive attention since they are not useful for energy production. However, in areas where natural beauty is prominent, as in the Anzer valley, such resources can easily trigger investment for all-season resorts that significantly contribute to the economy. In this study, we examine the site evidence and carry out self-potential and dc-resistivity sounding surveys using a Schlumberger electrode configuration. The resistivity cross-section obtained from the inversion …
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 …
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 …
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 …
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 …
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 …
Petrology, Geochemistry, And Evolution Of The Iron Skarns Along The Northern Contact Of The Eğrigöz Plutonic Complex, Western Anatolia, Turkey, Tolga Oyman, İsmet Özgenç, Murat Tokcaer, Mehmet Akbulut
Petrology, Geochemistry, And Evolution Of The Iron Skarns Along The Northern Contact Of The Eğrigöz Plutonic Complex, Western Anatolia, Turkey, Tolga Oyman, İsmet Özgenç, Murat Tokcaer, Mehmet Akbulut
Turkish Journal of Earth Sciences
The Çatak and Küreci skarn districts are located approximately 10 km NW of Emet (Kütahya) in Western Turkey. The skarn and associated ore formations mainly occur at the contact between intrusive rocks of the Eğrigöz Plutonic Complex (EPC) and calcareous pelitic schists with limestone lenses of the Sarıcasu Formation and meta-carbonate rocks of the Arıkaya Formation. The major, trace, and rare earth element analysis of the igneous rocks indicate that they are high level, subalkaline, calc-alkaline, peraluminous to metaluminous I-type intrusions, generated in a continental arc setting. Three distinct skarn-type mineralization, differing in their host rocks and distance from the …
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 …
Afc-Modeler: A Microsoft® Excel© Workbook Program For Modelling Assimilation Combined With Fractional Crystallization (Afc) Process In Magmatic Systems By Using Equations Of Depaolo (1981), Mehmet Keski̇n
Turkish Journal of Earth Sciences
AFC-Modeler is a user-friendly, interactive Microsoft Excel workbook program which is specifically designed to model up to ten theoretical AFC curves (corresponding to ten different r values; r being the ratio of mass assimilation rate to fractional crystallization rate) for a set of variables that can be interactively and precisely modified by the user (i.e. D, initial element concentration and isotope ratio in magma and element concentration and isotope ratio in wallrock). Being able to model ten curves for ten different 'r' values is an important feature of the program, because results of many studies indicate that the r values …
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.
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.