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Articles 7141 - 7170 of 10319
Full-Text Articles in Physical Sciences and Mathematics
Dynamical Behavior Of Traveling Wave Solutions For The K(2,2) Equation, Lina Zhang
Dynamical Behavior Of Traveling Wave Solutions For The K(2,2) Equation, Lina Zhang
Turkish Journal of Physics
In this paper, we discuss the qualitative behavior of degenerate singular points for the K(2,2) equation. By analyzing the different dynamical behaviors of the singular system and its associated regular system, we come to the conclusion that for the singular system the smoothness property of its orbits, which have intersection point(s) with the singular straight line, will not be destroyed. Meanwhile, the corresponding smooth traveling wave solutions for the K(2,2) equation are obtained.
Hydromagnetic Thermal Boundary Layer Flow Of A Perfectly Conducting Fluid, Kalidas Das
Hydromagnetic Thermal Boundary Layer Flow Of A Perfectly Conducting Fluid, Kalidas Das
Turkish Journal of Physics
Using successive approximation technique, an analysis of unsteady hydromagnetic boundary layer flow with thermal relaxation of perfectly conducting, viscous incompressible fluid past a semi-infinite porous plate in presence of heat absorbing sinks is carried out. The expression for velocity and temperature fields, local skin friction coefficient, local heat transfer coefficient etc have been derived when the free stream velocity exponentially depends on time. The effects of different parameters entering into the problem are shown graphically and discussed numerically.
Faulting And Stress Distribution In The Bolu Pull-Apart Basin (North Anatolian Fault Zone, Turkey): The Significance Of New Dates Obtained From The Basin Fill, Ergun Gökten, Ramazan Demi̇rtaş, Volkan Özaksoy, Erdal Herece, Baki̇ Varol, Uğur Temi̇z
Faulting And Stress Distribution In The Bolu Pull-Apart Basin (North Anatolian Fault Zone, Turkey): The Significance Of New Dates Obtained From The Basin Fill, Ergun Gökten, Ramazan Demi̇rtaş, Volkan Özaksoy, Erdal Herece, Baki̇ Varol, Uğur Temi̇z
Turkish Journal of Earth Sciences
The Bolu Basin in northwestern Turkey, situated in the western part of the North Anatolian Fault Zone (NAFZ), displays the neotectonic features of a pull apart basin. The long axis of the basin extends east-west, parallel to the fault zone and Bolu city, situated in the central part of this basin, was extensively damaged during the 17 August 1999 M= 7.4 and 12 November 1999 M= 7.2 earthquakes. The master strand of the North Anatolian Fault Zone cuts through the basin close to its southern edge and movement on this strand has caused tilting of the basin floor towards the …
Geology And Correlation Of The Mersin Mélanges, Southern Turkey, Patrice Moix, Laurent Beccaletto, Olivier Masset, Heinz W. Kozur, Paulian Dumitrica, Daniel Vachard, Rossana Martini, Gerard Stampfli
Geology And Correlation Of The Mersin Mélanges, Southern Turkey, Patrice Moix, Laurent Beccaletto, Olivier Masset, Heinz W. Kozur, Paulian Dumitrica, Daniel Vachard, Rossana Martini, Gerard Stampfli
Turkish Journal of Earth Sciences
Our paper aims to give a thorough description of the infra-ophiolitic mélanges associated with the Mersin ophiolite. We propose new regional correlations of the Mersin mélanges with other mélange-like units or similar series, located both in southern Turkey and adjacent regions. The palaeotectonic implications of the correlations are also discussed. The main results may be summarized as follows: the infra-ophiolitic mélange is subdivided into two units, the Upper Cretaceous Sorgun ophiolitic mélange and the Ladinian-Carnian Hacialanı mélange. The Mersin mélanges, together with the Antalya and Mamonia domains, are represented by a series of exotic units now found south of the …
Short Note On The Use Of Neotectonic And Palaeotectonic Nomenclature, Douwe J.J. Van Hinsbergen
Short Note On The Use Of Neotectonic And Palaeotectonic Nomenclature, Douwe J.J. Van Hinsbergen
Turkish Journal of Earth Sciences
The terms 'palaeotectonic' and 'neotectonic' are entrenched in the literature of Anatolian geology, used to subdivide the tectonic history before and after the last major tectonic change, which is frequently linked to the Arabia-Eurasia collision and the onset of westward Anatolian escape along the North Anatolian Fault Zone. This short note, however, illustrates that many different authors use different definitions for the age and cause of onset, and style of 'neotectonics', leading to needless confusion in Turkish geological literature. In addition, in recent years it has become common practice to use the neotectonic period as a stratigraphic correlation tool, leading …
First Records Of Late Devonian Entomozoacean Ostracods In North-Western Turkey, Ati̇ke Nazi̇k, Helga Groos-Uffenorde
First Records Of Late Devonian Entomozoacean Ostracods In North-Western Turkey, Ati̇ke Nazi̇k, Helga Groos-Uffenorde
Turkish Journal of Earth Sciences
Entomozoacean ostracods (pelagic socalled fingerprint-ostracods) have recently been observed for the first time in Upper Devonian sediments of the Darlık B Section from the İstanbul region, north-western Turkey. These new assemblages consist of Entomoprimitia nitida, Entomoprimitia sartenaeri, Entomoprimitia concentrica, Franklinella calcarata, Waldeckella erecta?, Rabienella n. sp. c, aff. reichi sensu Rabien & Rabitz 1958, Rabienella reichi, Richterina (Volkina) zimmermanni and Nehdentomis pseudorichterina and can be dated as Late Frasnian Entomoprimitia sartenaeri Zone (= variostriata Zone sensu Rabien 1954). These entomozoacean ostracods indicate a faunal relationship with Germany (Rhenish Schiefergebirge, Harz Mountains, Thuringia), Poland (Holy Cross Mountains), N France-Belgium (Ardennes), Volgo-Ural …
A New Species Of Angariid Gastropod From The Early Thanetian Of The Haymana-Polatlı Basin, Turkey, İzzet Hoşgör, Yavuz Okan
A New Species Of Angariid Gastropod From The Early Thanetian Of The Haymana-Polatlı Basin, Turkey, İzzet Hoşgör, Yavuz Okan
Turkish Journal of Earth Sciences
A new trochoidean species, Angaria calvii n. sp., from the early Thanetian of the Kırkkavak Formation (Haymana-Polatlı Basin, Palaeocene) in central Anatolia, is described and placed in the family Turbinidae. Previously, the oldest Cenozoic Angaria was recorded from the Early Palaeocene (Danian) in France (Paris Basin). In this paper, we report the second discovery of the oldest angariid specimens from the Thanetian sediments of the Tethys realm, a stratigraphic position which is supported by the foraminiferal-red alga assemblages at this locality.
Integrated Oligocene−Lower Miocene Larger And Planktonic Foraminiferal Biostratigraphy Of The Kahramanmaraş Basin (Southern Anatolia, Turkey), Uğraş Işik, Aynur Hakyemez
Integrated Oligocene−Lower Miocene Larger And Planktonic Foraminiferal Biostratigraphy Of The Kahramanmaraş Basin (Southern Anatolia, Turkey), Uğraş Işik, Aynur Hakyemez
Turkish Journal of Earth Sciences
An integrated biostratigraphical analysis based on the larger and planktonic foraminifera from three sections provides a well-defined zonal scheme of the Oligocene-Lower Miocene successions in the Kahramanmaraş Basin. The planktonic foraminiferal zonation is based on a combination of standard (P) and Mediterranean (MMi) zonal schemes and consists of Turborotalia ampliapertura (P19), Globigerina angulisuturalis-Paragloborotalia opima opima (P21), Globigerina ciperoensis (P22) biozones spanning the Upper Rupelian-Chattian interval and Globoquadrina dehiscens-Globigerinoides altiaperturus (MMi 2a), Globigerinoides altiaperturus-Catapsydrax dissimilis (MMi 2b) and Globigerinoides trilobus (MMi 3) biozones in the Upper Aquitanian-Burdigalian interval. The larger foraminiferal zonation of the studied successions has been established by means …
New Data On The Dasycladales From The Lower Eocene Of Seyitgazi Region, Eskişehir, Central Turkey, Rajka Radoicic, Nazi̇re Erdem
New Data On The Dasycladales From The Lower Eocene Of Seyitgazi Region, Eskişehir, Central Turkey, Rajka Radoicic, Nazi̇re Erdem
Turkish Journal of Earth Sciences
An association of Dasycladalean algae is identified from the Lower Eocene (Ilerdian-Cuisian) of the Seyitgazi area, Western Anatolia. The association consists mostly of the genus Belzungia Morellet and Anatolia n. gen. This is the first discovery of such a rich and diversified dasycladalean flora with Belzungia in the Eocene of Central Tethys. The genus Belzungia is represented by four species: Belzungia terquemi Morellet, B. silvestrii (Pfender), B. bella (Ju Ying) Radoicic and B. pfenderae n. sp. Belzungia articles consist of whorls characterized by an assemblage of laterals, in the transversal section of which, the primary laterals are distally enlarged (sub-triangular …
Geodynamic Significance Of The Early Triassic Karaburun Granitoid (Western Turkey) For The Opening History Of Neo-Tethys, Cüneyt Akal, Osman Ersi̇n Koralay, Osman Candan, Oberhaensli Roland, Fukun Chen
Geodynamic Significance Of The Early Triassic Karaburun Granitoid (Western Turkey) For The Opening History Of Neo-Tethys, Cüneyt Akal, Osman Ersi̇n Koralay, Osman Candan, Oberhaensli Roland, Fukun Chen
Turkish Journal of Earth Sciences
The Karaburun Peninsula, which is considered part of the Anatolide-Tauride Block of Turkey, contains clastic and carbonate sequences deposited on the northern margin of Gondwana. The Palaeozoic clastic sequence, which is intruded by the Early Triassic granitoid and tectonically overlies a Mesozoic mélange sequence, can be divided into three subunits: a lower clastic subunit consisting of a sandstone-shale alternation, an upper clastic subunit consisting of black chert-bearing shales, sandstone and conglomerate, and a Permo-Carboniferous carbonate subunit. The lower Triassic Karaburun I-type granitoid has a high initial ^8^7Sr/^8^6Sr ratio (0.709021-0.709168), and low ^1^4^3Nd/^1^4^4Nd ratio (0.512004-0.512023) and \epsilonNd (-5.34 to -5.70) isotopic …
Geology And Tectonic Emplacement Of Eclogite And Blueschists, Biga Peninsula, Northwest Turkey, Firat Şengün, Erdi̇nç Yi̇ği̇tbaş, İsmai̇l Onur Tunç
Geology And Tectonic Emplacement Of Eclogite And Blueschists, Biga Peninsula, Northwest Turkey, Firat Şengün, Erdi̇nç Yi̇ği̇tbaş, İsmai̇l Onur Tunç
Turkish Journal of Earth Sciences
The Biga Peninsula in northwestern Anatolia is a tectonic mosaic, comprising different tectonic units, representing the Sakarya Continent and oceanic assemblages of different origin and ages. The Çamlıca metamorphic association, a member of this orogenic mosaic in the westernmost part of the peninsula, is subdivided into three formations, from bottom to top; the Andıktaşı formation, the Dedetepe formation, and the Salihler formation. Eclogite-facies metamorphic rocks occur as tectonic slices within schist-marble intercalations of the Dedetepe formation. These slices, about 2 km long and 500 m wide, include two different rock types; (i) quartz-mica schists, and (ii) metabasite lenses with eclogite/blueschist …
Sphalerite Associated With Pyrrhotite-Chalcopyrite Ore Occurring In The Kotana Fe-Skarn Deposit (Giresun, Ne Turkey): Exsolution Or Replacement, Emi̇n Çi̇ftçi̇
Sphalerite Associated With Pyrrhotite-Chalcopyrite Ore Occurring In The Kotana Fe-Skarn Deposit (Giresun, Ne Turkey): Exsolution Or Replacement, Emi̇n Çi̇ftçi̇
Turkish Journal of Earth Sciences
The Kotana prospect is located about 30 km south of Giresun (NE Turkey). The ore mineralization is a Fe-skarn occurring within the low-grade pre-Lower Jurassic Pınarlar metamorphics, consisting of marble-phyllite intruded by the Upper Cretaceous-Eocene Aksu biotite monzogranite. The principal primary ore minerals include pyrrhotite and magnetite along with minor pyrite (I) and chalcopyrite, accompanied by trace sphalerite. Sphalerite is closely associated with chalcopyrite and to a lesser extent with hexagonal pyrrhotite. Secondary ore minerals include pyrite (II), marcasite, martite, hematite, goethite, lepidocrocite, and intermediate Fe-oxides-hydroxides. Gangue minerals are mainly calcite and quartz. Oxidation of the primary sulphides resulted in …
Lagrangian Prediction And Correlation Analysis With Eulerian Data, Mi̇ne Çağlar, Taylan Bi̇lal, Leonid Piterbarg
Lagrangian Prediction And Correlation Analysis With Eulerian Data, Mi̇ne Çağlar, Taylan Bi̇lal, Leonid Piterbarg
Turkish Journal of Earth Sciences
A velocity field obtained from the ocean surface by high-frequency radar is used to test Lagrangian prediction algorithms designed to evaluate the position of a particle given its initial position and observations of several other simultaneously released particles. The problem is motivated by oceanographic applications such as search and rescue operations and spreading pollutants, especially in coastal regions. The prediction skill is essentially determined by temporal and spatial covariances of the underlying velocity field. For this reason correlation analysis of both Lagrangian and Eulerian velocities was carried out. Space covariance functions and spectra of the velocity field are also presented …
Geophysical Variations During The Total Solar Eclipse In 2006 In Turkey, Abdullah Ateş, Aydin Büyüksaraç, Özcan Bektaş
Geophysical Variations During The Total Solar Eclipse In 2006 In Turkey, Abdullah Ateş, Aydin Büyüksaraç, Özcan Bektaş
Turkish Journal of Earth Sciences
It has been observed that some geophysical parameters could be changed during a solar eclipse. We have therefore measured gravity and magnetic fields during solar eclipses. We also measured the gravity field during the previous eclipse on the 11^t^h of August, 1999. Gravity measurements on the 29^t^h of March, 2006 are compared with previous gravity measurements at the same location during the eclipse on the 11^t^h of August, 1999. Both showed the same behaviour during the eclipses. Gravity measurements showed fluctuations during both eclipses. A decrease in the intensity of the magnetic field was observed. Low-pass filtered magnetic data show …
The North Anatolian Fault On The Hersek Peninsula, Turkey: Its Geometry And Implications For The 1999 İzmit Earthquake Rupture Propagation, Özgür Kozaci, Erhan Altunel, Scott Lindvall, Charles Brankman, William Lettis
The North Anatolian Fault On The Hersek Peninsula, Turkey: Its Geometry And Implications For The 1999 İzmit Earthquake Rupture Propagation, Özgür Kozaci, Erhan Altunel, Scott Lindvall, Charles Brankman, William Lettis
Turkish Journal of Earth Sciences
The western termination of the 1999 İzmit earthquake still remains as an intriguing problem for researchers and the people residing around the Sea of Marmara. There have been numerous offshore mapping and modelling studies performed in the Gulf of İzmit. However, the main debate about the western termination of the 1999 İzmit surface rupture is linked to the Hersek Peninsula and corresponding fault geometry. We focused our efforts at resolving the fault geometry on the Hersek Peninsula by applying geological mapping, geomorphic analyses, palaeoseismic trenching and geophysical surveys. Our studies reveal that the North Anatolian Fault forms a restraining stepover …
Palaeoseismological Investigations On The Karadere Segment, North Anatolian Fault Zone, Turkey, Aynur Di̇kbaş, Hüsnü Serdar Akyüz
Palaeoseismological Investigations On The Karadere Segment, North Anatolian Fault Zone, Turkey, Aynur Di̇kbaş, Hüsnü Serdar Akyüz
Turkish Journal of Earth Sciences
The Karadere segment of the North Anatolian Fault (NAF) is the easternmost part that ruptured during the 17 August 1999 İzmit earthquake (Mw 7.4). It has a different orientation, at N65°E to other segments which have a nearly E-W trend, and lesser dextral displacement, with maximum 2.3 m in contrast with 5.2 m in the ruptured neighbouring western segment. Two palaeoseismological trenches, at Kazimiye and Karadere sites, were excavated on the central part of the Karadere segment to determine the timing of past earthquakes. Excavation of the Kazimiye site revealed the occurrence of five past events since the 4th century …
The 6 September 2009 Mw5.4 Earthquake In Eastern Albania – Fyrom Border: Focal Mechanisms, Slip Model, Shakemap, Anastasia Kiratzi
The 6 September 2009 Mw5.4 Earthquake In Eastern Albania – Fyrom Border: Focal Mechanisms, Slip Model, Shakemap, Anastasia Kiratzi
Turkish Journal of Earth Sciences
On 6 September 2009 (GMT 21:49) a moderate Mw5.4 earthquake sequence burst at the eastern border of Albania with the Former Yugoslav Republic of Macedonia (FYROM). The main shock was located ~6 km north of the epicentre of the 30 November 1967 Mw6.2 Dibra (or Debar) earthquake, which caused loss of life and considerable damage to buildings. We use broad band waveforms recorded by the Hellenic Unified Seismic Network (HUSN), which receives real-time waveforms from the neighbouring networks, to compute focal mechanisms, obtain the slip model and derive the Shake Map of the mainshock. The focal mechanisms of 18 of …
Upper Jurassic Reefs From The Russian Western Caucasus: Implications For The Eastern Black Sea, Li Guo, Stephen J. Vincent, Vladimir Lavrishchev
Upper Jurassic Reefs From The Russian Western Caucasus: Implications For The Eastern Black Sea, Li Guo, Stephen J. Vincent, Vladimir Lavrishchev
Turkish Journal of Earth Sciences
Exposures of Upper Jurassic reef outcrops in the Russian western Caucasus provide excellent field analogues for possible reef-complex reservoir targets imaged on seismic reflection data from the northern Shatskiy Ridge, eastern Black Sea. The reefs at outcrop can be generally grouped into coral-dominated, siliceous sponge-microbialite and microbialite types. Coral-dominated reefs occur as isolated patchy and massive forms, and can be subdivided into higher-diversity and low-diversity types. The former developed at shallow-water platform margins and in platform interiors, whilst the latter occurred in deeper-water mid-shelf settings. Siliceous sponge-microbialite and microbialite reefs occur as lenses and mounds that were restricted to deeper-water …
Growth-Invariant Meristic Characters Tools To Reveal Phylogenetic Relationships In Nummulitidae (Foraminifera), Johann Hohenegger
Growth-Invariant Meristic Characters Tools To Reveal Phylogenetic Relationships In Nummulitidae (Foraminifera), Johann Hohenegger
Turkish Journal of Earth Sciences
Morphological characters that are restricted to a few growth-independent characters (such as the embryonic apparatus of nummulitids) or measurements at arbitrarily chosen growth stages (such as the second whorl in planispiral tests) do not adequately explain the phylogenetic relationships of fossil forms. Molecular-genetic investigations enlighten phylogenetic relations, but have two main disadvantages. First, they are restricted to living forms, and second, these relations are based on an extremely small part of the DNA and never on developmental and structural genes that regulate morphology. Morphometric methods based on growth-invariant characters allow modelling the test shape for each growth stage and thus …
The Role Of The Palaeogene Adriatic Carbonate Platform In The Spatial Distribution Of Alveolinids, Katica Drobne, Vlasta Cosovic, Alan Moro, Damir Buckovic
The Role Of The Palaeogene Adriatic Carbonate Platform In The Spatial Distribution Of Alveolinids, Katica Drobne, Vlasta Cosovic, Alan Moro, Damir Buckovic
Turkish Journal of Earth Sciences
Sediments of the Palaeogene Adriatic carbonate platform, a distinctive palaeogeographic unit, are today exposed along the eastern Adriatic coast for a distance of 800 km and a width of 100-130 km. The large number of identified alveolinid species (69) from the Early Ypresian (Ilerdian) to the Bartonian record the dynamics of their evolution, with emphasis on the following: (1) great species diversity and great abundance in the middle Ilerdian (SBZ 7-8) followed by a sharp decline in occurrences at the Ilerdian/Cuisian transition; (2) a diversity boom in the late Ypresian (late Cuisian, SBZ 11-12) and (3) an abrupt decrease in …
Early Oligocene Larger Foraminiferal Biostratigraphy Of The Qom Formation, South Of Uromieh (Nw Iran), Mohsen Yazdi Moghadam
Early Oligocene Larger Foraminiferal Biostratigraphy Of The Qom Formation, South Of Uromieh (Nw Iran), Mohsen Yazdi Moghadam
Turkish Journal of Earth Sciences
The marine strata of the Qom Formation south of Uromieh (Baranduz) yielded a moderately diverse larger benthic foraminiferal fauna resembling the fauna already described from European marine sequences. The fauna allowed the author to correlate the larger foraminiferal assemblage of northwestern Iran with the standard shallow benthic zonation. The assemblage is dominated by hyaline and porcellaneous forms including Operculina, Nummulites, Neorotalia, Penarchaias, Victoriella, Peneroplis, Praerhapydionina, Spirolina, Halkyardia, Planorbulina, Dendritina, Borelis and Bullaveolina. This faunal assemblage is also accompanied by coralline alga Subterraniphyllum thomasii. The presence of Nummulites cf. fichteli and N. cf. vascus in the absence of Lepidocyclina allows correlation …
Stratigraphy And Larger Foraminifera Of The Middle Eocene To Lower Oligocene Shallow-Marine Units In The Northern And Eastern Parts Of The Thrace Basin, Nw Turkey, György Less, Ercan Özcan, Aral Okay
Stratigraphy And Larger Foraminifera Of The Middle Eocene To Lower Oligocene Shallow-Marine Units In The Northern And Eastern Parts Of The Thrace Basin, Nw Turkey, György Less, Ercan Özcan, Aral Okay
Turkish Journal of Earth Sciences
The shallow-marine Eocene Soğucak Limestone and Oligocene Ceylan Formation were studied in the northern and eastern parts of the Thrace Basin with detailed biometric analysis of the full spectrum of larger benthic foraminifera (mainly nummulitids and orthophragmines). This allows us to establish a high-resolution biostratigraphy in the context of the shallow benthic zonation (with SBZ zones) of the Tethyan Palaeogene since larger foraminiferal assemblages show a very strong Western Tethyan affinity. Only two species (Heterostegina armenica and Orbitoclypeus haynesi) are unknown so far to the west of the Thrace Basin. The age of particular larger foraminiferal sites is determined based …
The Gümüldür Fire Opal: Mode Of Occurrence And Mineralogical Aspects, Zeki̇ye Karacik, Şengül Can Genç, Recep Fahri̇ Esenli̇, Gülteki̇n Göller
The Gümüldür Fire Opal: Mode Of Occurrence And Mineralogical Aspects, Zeki̇ye Karacik, Şengül Can Genç, Recep Fahri̇ Esenli̇, Gülteki̇n Göller
Turkish Journal of Earth Sciences
Five types of silica polymorphs have been identified in dacitic volcanics from the Gümüldür region of western Anatolia, Turkey. Two of them are micro-quartz and disordered cristobalite (opal-C) that occur within the groundmass of the dacitic volcanic rocks. The others are pore-filling opal nodules including mainly massy opal-CT (opal-CTM) and rarely lussatite (opal-CTL) and amorphous opal (opal-A). Red and orange opal nodules are very similar to the gemologically well-known fire opals. Results of structural, chemical and thermal studies of the Gümüldür opals reveal their origin and mode of occurrence. Opal-CTM has gel-like or nano-grain texture and opal-CTL has a fibrous, …
Geochemical And Sr-Nd Isotopic Characteristics Of Post-Collisional Calc-Alkaline Volcanics In The Eastern Pontides (Ne Turkey), Abdullah Kaygusuz, Mehmet Arslan, Wolfgang Siebel, Cüneyt Şen
Geochemical And Sr-Nd Isotopic Characteristics Of Post-Collisional Calc-Alkaline Volcanics In The Eastern Pontides (Ne Turkey), Abdullah Kaygusuz, Mehmet Arslan, Wolfgang Siebel, Cüneyt Şen
Turkish Journal of Earth Sciences
Major, trace element, K-Ar age and Sr-Nd isotopic data are presented for the Eocene Torul volcanics in the eastern Pontide orogenic belt (NE Turkey). The studied rocks are composed of basaltic andesitic, andesitic, trachyandesitic, and minor trachydacitic lavas associated with their pyroclastics. These rocks contain plagioclase (An2-44), hornblende (Mg#= 0.78-0.98), clinopyroxene (Wo43-46 En41-43 Fs10-15), biotite, quartz, and minor sanidine phenocrysts. K-Ar ages on hornblendes ages range from 43.99 (±2.59) to 33.45 (±2.32) Ma, within the Middle to Late Eocene. The volcanic rocks show calc-alkaline affinities and have medium to high K contents. They are enriched in large ion lithophile (LILE) …
First Report Of A Trilobite In The Carboniferous Of Eastern Pontides, Ne Turkey, Rai̇f Kandemi̇r, Rudy Lerosey-Aubril
First Report Of A Trilobite In The Carboniferous Of Eastern Pontides, Ne Turkey, Rai̇f Kandemi̇r, Rudy Lerosey-Aubril
Turkish Journal of Earth Sciences
The pre-Mesozoic basement of the Eastern Pontides consists of a Permo-Carboniferous sedimentary sequence including the Çatalçeşme and Hardişi formations. The Çatalçeşme Formation has yielded rich assemblages of fusulinids, corals, gastropods, brachiopods, bryozoans, algae, conodonts and plants. Hitherto trilobites were unknown from this formation; here we report the discovery of a pygidium from a dark grey limestone bed near the top. Trilobites are a minor component of benthic marine communities during the Late Pennsylvanian, and to our knowledge, the discovery of this pygidium constitutes the first report of their occurrence in deposits of this age in Turkey. The morphological characteristics of …
Late-Medieval Plagioclase-Titanaugite-Bearing Iron Slags Of The Yapraklı Area (Çankırı), Turkey, W. E. Sharp, Steven K. Mittwede
Late-Medieval Plagioclase-Titanaugite-Bearing Iron Slags Of The Yapraklı Area (Çankırı), Turkey, W. E. Sharp, Steven K. Mittwede
Turkish Journal of Earth Sciences
A mineralogical, mineral-geochemical and ^1^4C geochronological study of slags, previously identified as copper slags, in the Yapraklı area (Çankırı Province) of central Anatolia, has demonstrated that these are late-medieval iron slags consisting mainly of fayalite, glass, plagioclase, titanaugite, ulvöspinel and metallic iron. Because of the high lime content, relative to other medieval and Roman slags, these slags are quite anomalous in their lack of both modal and normative wüstite. Further study of these sites could shed light on the mining history and smelting methods of central Anatolia during a relatively obscure period of major socio-ethnic transition.
Western Termination Of The Mw 7.4, 1999 İzmit Earthquake Rupture: Implications For The Expected Large Earthquake In The Sea Of Marmara, Gülsen Uçarkuş, Zi̇yadi̇n Çakir, Rolando Armijo
Western Termination Of The Mw 7.4, 1999 İzmit Earthquake Rupture: Implications For The Expected Large Earthquake In The Sea Of Marmara, Gülsen Uçarkuş, Zi̇yadi̇n Çakir, Rolando Armijo
Turkish Journal of Earth Sciences
The Mw 7.4, August 17, 1999 İzmit earthquake ruptured a ~100-km-long onshore section of the North Anatolian Fault (NAF) in the eastern Marmara region, causing the loss of more than 20,000 people and extensive destruction. The western termination and total length of the earthquake rupture is still a matter of debate because the surface rupture goes offshore in the Gulf of İzmit after displaying a coseismic displacement of ~5 m. Such a considerable slip implies that the fault rupture must definitely continue some distance westward on the sea floor, but where exactly it terminated is difficult to determine. This issue …
Palaeoearthquakes On The Kelkit Valley Segment Of The North Anatolian Fault, Turkey: Implications For The Surface Rupture Of The Historical 17 August 1668 Anatolian Earthquake, Cengi̇z Zabci, Hüsnü Serdar Akyüz, Volkan Karabacak, Taylan Sançar, Erhan Altunel, Hali̇l Gürsoy, Orhan Tatar
Palaeoearthquakes On The Kelkit Valley Segment Of The North Anatolian Fault, Turkey: Implications For The Surface Rupture Of The Historical 17 August 1668 Anatolian Earthquake, Cengi̇z Zabci, Hüsnü Serdar Akyüz, Volkan Karabacak, Taylan Sançar, Erhan Altunel, Hali̇l Gürsoy, Orhan Tatar
Turkish Journal of Earth Sciences
The 26 December 1939 Erzincan (Ms= 7.8) and 20 December 1942 Erbaa-Niksar (Ms= 7.1) earthquakes created a total surface rupture more than 400 km between Erzincan and Erbaa on the middle to eastern sections of the North Anatolian Fault. These two faulting events are separated by a 10-km-wide releasing stepover, which acted like a seismic barrier in the 20th century. To understand the rupture behaviour in this structurally complex section of the North Anatolian Fault, we undertook palaeoseismological trench investigations on the Kelkit Valley segment where there is little or no palaeoseismic information. We found evidence for three surface faulting …
Geological, Geomorphological And Archaeoseismological Observations Along The Cibyra Fault And Their Implications For The Regional Tectonics Of Sw Turkey, Volkan Karabacak
Geological, Geomorphological And Archaeoseismological Observations Along The Cibyra Fault And Their Implications For The Regional Tectonics Of Sw Turkey, Volkan Karabacak
Turkish Journal of Earth Sciences
In this paper, the Cibyra segment of the Fethiye-Burdur Fault Zone (FBFZ) is investigated using direct field evidence, which helps clarify the controversial behaviour of this zone. The remains of the ancient city of Cibyra which is located on the Cibyra Fault provide invaluable data in documenting traces of fault deformations and related palaeoearthquakes. Slickensides on fault planes, deflected stream beds and terraces, fault-parallel elongated ridges along the Cibyra Fault are the clearest surface evidence for left-lateral faulting. Archaeoseismological evidence in the ancient city is consistent with the geological and geomorphological observations along the fault. Based on detailed field observations, …
Geological And Palaeoseismological Evidence For Late Pleistocene−Holocene Activity On The Manisa Fault Zone, Western Anatolia, Çağlar Özkaymak, Hasan Sözbi̇li̇r, Bora Uzel, Hüsnü Serdar Akyüz
Geological And Palaeoseismological Evidence For Late Pleistocene−Holocene Activity On The Manisa Fault Zone, Western Anatolia, Çağlar Özkaymak, Hasan Sözbi̇li̇r, Bora Uzel, Hüsnü Serdar Akyüz
Turkish Journal of Earth Sciences
In West Anatolia near the cities of İzmir and Manisa, the historical occurrence of large earthquakes suggests the presence of important seismogenic faults. However, these faults have yet to be investigated in detail. The Manisa Fault Zone (MFZ) is an active large-scale normal fault system in this area, and thus field observations and palaeoseismological studies of this zone are important for predicting future earthquakes. Hence we sought to document geological and palaeoseismological evidence for Holocene activity on the MFZ. We performed trenching to determine the magnitude and timing of past surface-faulting events using detailed fault-trace mapping, measurements of Upper Pleistocene-Lower …