Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Turkey (101)
- Geochemistry (55)
- Earthquake (25)
- Biostratigraphy (24)
- Western Anatolia (24)
-
- Central Anatolia (22)
- Eastern Pontides (21)
- Eocene (14)
- NW Turkey (14)
- Provenance (14)
- Anatolia (13)
- Black Sea (13)
- Iran (13)
- Miocene (13)
- Planktonic foraminifera (13)
- Mineralogy (12)
- Oligocene (12)
- Palynology (12)
- North Anatolian Fault (11)
- Palaeoclimate (11)
- Türkiye (11)
- Larger benthic foraminifera (10)
- Stratigraphy (10)
- Western Turkey (10)
- Benthic foraminifera (9)
- Eastern Anatolia (9)
- Geothermal (9)
- Holocene (9)
- Ophiolite (9)
- Paleoclimate (9)
- Publication Year
Articles 721 - 750 of 917
Full-Text Articles in Earth Sciences
Benthonic Foraminiferal Biostratigraphy Of The Upper Cretaceous (Middle Cenomanian−Coniacian) Sequences Of The Bey Dağları Carbonate Platform, Western Taurides, Turkey, Bi̇lal Sari, Kemal Tasli, Saci̇t Özer
Benthonic Foraminiferal Biostratigraphy Of The Upper Cretaceous (Middle Cenomanian−Coniacian) Sequences Of The Bey Dağları Carbonate Platform, Western Taurides, Turkey, Bi̇lal Sari, Kemal Tasli, Saci̇t Özer
Turkish Journal of Earth Sciences
Identification of the benthonic foraminiferal assemblages from ten stratigraphic sections from the inner platform limestones of the Middle Cenomanian−Coniacian successions of the Bey Dağları carbonate platform (BDCP) allowed the recognition of one biozone and two subzones. The lower part of the platform limestones (Middle−Upper Cenomanian) is represented by relatively rich benthonic foraminiferal assemblages, while the upper part (Turonian−Coniacian) contains poor assemblages. The benthonic foraminiferal assemblages determined in the BDCP are dominated by long-ranging species. The shorter-ranging, stratigraphical index species have been selected to date the Upper Cretaceous platform limestones of the BDCP based on the distributions of the species in …
Ophiolite-Hosted Copper And Gold Deposits Of Southeastern Turkey: Formation And Relationship With Seafloor Hydrothermal Processes, Ömer Tezcan Akinci
Ophiolite-Hosted Copper And Gold Deposits Of Southeastern Turkey: Formation And Relationship With Seafloor Hydrothermal Processes, Ömer Tezcan Akinci
Turkish Journal of Earth Sciences
The paper documents evidence about the physical and chemical controls on the behaviour of Au and Cu sulphide deposits in fossil seafloor hydrothermal systems of SE Turkey. Observations from actively forming sulphides at mid-ocean ridges (MOR) and in back-arc environments are compared briefly with ancient analogues of gold and pyritic copper deposits such as Kisecik, Ergani and Siirt-Madenköy, formed at mid-oceanic ridges, or possibly at seamounts and back-arc settings. Many ophiolite-hosted Au- and Cu-deposits, of various sizes, are known to exist along the Bitlis-Zagros Suture Zone (BZS), the boundary between Anatolian and Arabian plates in SE Turkey. These deposits are …
Contemporaneous Late Cretaceous Calc-Alkaline And Alkaline Magmatism In Central Anatolia, Turkey: O Isotope Constraints On Petrogenesis, Nurdane İlbeyli̇, Julian A. Pearce, Ian G. Meighan, Anthony E. Fallick
Contemporaneous Late Cretaceous Calc-Alkaline And Alkaline Magmatism In Central Anatolia, Turkey: O Isotope Constraints On Petrogenesis, Nurdane İlbeyli̇, Julian A. Pearce, Ian G. Meighan, Anthony E. Fallick
Turkish Journal of Earth Sciences
A wide variety of rock types were produced by the latest Cretaceous magmatism in the Central Anatolian Crystalline Complex. These rocks can be divided into three distinct units: (i) calc-alkaline, (ii) subalkaline/transitional, and (iii) alkaline. The calc-alkaline rocks are mainly metaluminous (I-type) ranging from monzodiorite to granite. The subalkaline/transitional rocks are also metaluminous (I-type) ranging from monzonite to granite. The alkaline rocks are mainly peralkaline (A-type), ranging from feldspathoid-bearing monzosyenite to granite. Whole-rock oxygen isotope data from the complex have a considerable range of \delta18O values between 6.5 per thousand and 14.8 per thousand. Initial 87Sr/86Sr versus 143Nd/144Nd ratios, and …
U-Pb Zircon Shrimp Ages, Geochemical And Sr-Nd Isotopic Compositions Of The Early Cretaceous I-Type Sarıosman Pluton, Eastern Pontides, Ne Turkey, Abdullah Kaygusuz, Bin Chen, Zafer Aslan, Wolfgang Siebel, Cüneyt Şen
U-Pb Zircon Shrimp Ages, Geochemical And Sr-Nd Isotopic Compositions Of The Early Cretaceous I-Type Sarıosman Pluton, Eastern Pontides, Ne Turkey, Abdullah Kaygusuz, Bin Chen, Zafer Aslan, Wolfgang Siebel, Cüneyt Şen
Turkish Journal of Earth Sciences
The petrogenesis and U-Pb SHRIMP zircon ages of the Late Cretaceous Sarıosman pluton in the Eastern Pontides is investigated by means of whole-rock Sr-Nd isotope data with field, petrographic and whole-rock geochemical studies. The bulk of the I-type Sarıosman pluton consists of biotite-hornblende monzogranite, with minor quantities of porphyritic hornblende-biotite monzogranite. The biotite-hornblende monzogranite contains a number of mafic microgranular enclaves (MMEs) of quartz monzodiorite composition. U-Pb zircon sensitive high-resolution ion microprobe dating (SHRIMP) dates the magma emplacement age of the biotite-hornblende monzogranite at 82.7±1.5 Ma. The rocks of the pluton show high-K calc-alkaline, metaluminous to slightly peraluminous characteristics, and …
Subduction-Related Eocene Shoshonites From The Cenozoic Urumieh-Dokhrat Magmatic Arc (Qaleh-Khargooshi Area, West Of The Yazd Province, Iran), Ghodrat Torabi
Subduction-Related Eocene Shoshonites From The Cenozoic Urumieh-Dokhrat Magmatic Arc (Qaleh-Khargooshi Area, West Of The Yazd Province, Iran), Ghodrat Torabi
Turkish Journal of Earth Sciences
The fifth phase of Eocene volcanism in the central part of the Urumieh-Dokhtar magmatic arc (UDMA), comprises lavas with shoshonitic characteristics, ranging from trachybasalt to trachydacite. In shoshonites of the Qaleh-Khargooshi area, leucite changes to analcime, analcime to albite, sanidine to albite and anorthoclase, and clinopyroxene to albite. These reactions, together with other field, petrographic and geochemical features, are evidence of an original absarokitic magma which was changing to generate the different rock units. The parental magma of these shoshonites was produced by a low degree of partial melting from a metasomatized enriched mantle source. During the ascent of shoshonitic …
Benthic Faunal Assemblages Of The Holocene Sediments From The Southwest Black Sea Shelf, Demet Ongan, Oya Algan, Sevi̇nç Kapan Yeşi̇lyurt, Ati̇ke Nazi̇k, Mustafa Ergi̇n, Christ Eastoe
Benthic Faunal Assemblages Of The Holocene Sediments From The Southwest Black Sea Shelf, Demet Ongan, Oya Algan, Sevi̇nç Kapan Yeşi̇lyurt, Ati̇ke Nazi̇k, Mustafa Ergi̇n, Christ Eastoe
Turkish Journal of Earth Sciences
Benthic faunal content (benthic foraminifera, mollusca and ostracoda) of sediment cores from the SW Black Sea shelf were examined. Based on the vertical distribution of abundance and diversity of the benthic fauna, three benthic assemblages were distinguished. These assemblages are BF1, BF2 and BF3, and reflect the changes in bottom water from the termination of the Neoeuxinian period to present. BF1 displays high abundance and diversity in the surroundings of the Bosporus channel, diminishing in the shelf sediments further away from the channel. In the Mid-Shelf and Outer Shelf, it displays low abundance and low diversity. BF1 which started to …
Empirical Attenuation Relationships For Western Anatolia, Turkey, Ni̇hal Akyol, Özlem Karagöz
Empirical Attenuation Relationships For Western Anatolia, Turkey, Ni̇hal Akyol, Özlem Karagöz
Turkish Journal of Earth Sciences
Seismic hazard studies have become progressively more important for earthquake engineering applications in western Anatolia, which contains one of the world’s best examples of a rapidly extending intra-continental tectonic regime. A two-stage regression analysis was applied to peak ground acceleration and 5%-damped spectral acceleration values of 168 recordings from 49 earthquakes in order to develop empirical attenuation relationships which can be used to predict ground motion for western Anatolia. Moment magnitudes for earthquakes range between 4.0 and 6.4 while the hypocentral distances range between 15 and 200 km in our dataset. Site classifications, as one of the predictor variables for …
Geochemistry Of The Middle Miocene Collision-Related Yamadaği ( Eastern Anatolia) Calc-Alkaline Volcanics, Turkey, Taner Eki̇ci̇, Musa Alpaslan, Osman Parlak, Ali̇ Uçurum
Geochemistry Of The Middle Miocene Collision-Related Yamadaği ( Eastern Anatolia) Calc-Alkaline Volcanics, Turkey, Taner Eki̇ci̇, Musa Alpaslan, Osman Parlak, Ali̇ Uçurum
Turkish Journal of Earth Sciences
Major, trace element and K-Ar age determinations are reported for a suite from the Yamadağı volcanics in the Eastern Anatolia. The exposed rocks mainly consist of medium-potassium calc-alkaline basaltic andesites, andesites and dacites. Petrographical data exhibit disequilibrium mineral textures, such as resorption of the ferromagnesian phases, clinopyroxene-mantled orthopyroxene, and sieve-textured plagioclases. The Yamadağı volcanics have a calk-alkaline character, and trace element characteristics exhibit that the volcanics resemble subduction zone volcanics and/or volcanics assimilated by continental crust. K/Ar age determinations show that the Yamadağı volcanics were formed during the 12 ± 0.5 - 15 ± 0.5 Ma time interval. Geochemical characteristics …
Fresh And Brackish Water Ostracods Of Upper Miocene Deposits, Arguvan/Malatya (Eastern Anatolia), Ati̇ke Nazi̇k, İbrahi̇m Türkmen, Cali̇be Koç, Ercan Aksoy, Ni̇yazi̇ Avşar, Hülya Yayik
Fresh And Brackish Water Ostracods Of Upper Miocene Deposits, Arguvan/Malatya (Eastern Anatolia), Ati̇ke Nazi̇k, İbrahi̇m Türkmen, Cali̇be Koç, Ercan Aksoy, Ni̇yazi̇ Avşar, Hülya Yayik
Turkish Journal of Earth Sciences
The Neogene Alibonca, Küseyin, Parçikan, Boyaca formations and the Mamaar volcanic unit occur at Arguvan (Malatya, Eastern Anatolia). Nine species of ostracods were identified and assigned to four genera in samples collected from the Küseyin and Parçikan formations. The faunal content in these units was characterized by few ostracod species and abundant individuals. Most samples contained fewer than nine species. Ilyocypris bradyi, Ilyocypris gibba, Candona parallela pannonica and Heterocypris salina are described in the Küseyin Formation. Cyprideis pannonica, Cyprideis anatolica, Cyprideis torosa, Ilyocypris gibba, Candona angulata, Candona neglecta, Candona parallela pannonica and Heterocypris salina are described in Parçikan Formation. Cyprideis, …
Geochemistry And Tectonic Environment Of Diverse Magma Generations Forming The Crustal Units Of The Kızıldağ (Hatay) Ophiolite, Southern Turkey, Utku Bağci, Osman Parlak, Volker Höck
Geochemistry And Tectonic Environment Of Diverse Magma Generations Forming The Crustal Units Of The Kızıldağ (Hatay) Ophiolite, Southern Turkey, Utku Bağci, Osman Parlak, Volker Höck
Turkish Journal of Earth Sciences
The Kızıldağ (Hatay) ophiolite is one of the best preserved Neotethyan oceanic lithospheric remnants in southern Turkey. It is represented by, from bottom to top, mantle tectonites, ultramafic to mafic cumulates, isotropic gabbros, sheeted dike complex, plagiogranites and extrusives (low-K tholeiites and boninites). The ultramafic to mafic cumulate rocks are composed of dunite, wehrlite, olivine gabbro, olivine gabbronorite and gabbro. The crystallization order of cumulus phases, and the presence of highly magnesian olivines and pyroxenes as well as highly calcic plagioclases in the cumulates, indicate a subduction-related tectonic environment and suggest derivation from an island arc tholeiitic magma. The isotropic …
Late Cenozoic Sedimentary Evolution Of The Antalya Basin, Southern Turkey, Atti̇la Çi̇ner, Mustafa Karabiyikoğlu, Olivier Monod, Max Deynoux, Sevi̇m Tuzcu
Late Cenozoic Sedimentary Evolution Of The Antalya Basin, Southern Turkey, Atti̇la Çi̇ner, Mustafa Karabiyikoğlu, Olivier Monod, Max Deynoux, Sevi̇m Tuzcu
Turkish Journal of Earth Sciences
The Late Cenozoic Antalya Basin developed unconformably on a foundered basement comprising Mesozoic autochthonous carbonate platform(s) overthrust by the Lycian Nappes, the Antalya Nappes and the Alanya Massif metamorphics within the Isparta Angle, southern Turkey. The present configuration of the basin consists of three distinct parts, referred herein as the Aksu, Köprüçay and Manavgat sub-basins, respectively, which are divided by the north-south-trending Kırkkavak Fault and the westward-verging Aksu Thrust. The Miocene fill of each sub-basin is characterized by thick accumulations of non-marine to marine clastics with locally developed coralgal reefs and reefal shelf carbonates. Based on lithostratigraphic and chronostratigraphic considerations, …
Palaeoenvironmental Investigation Of Sapropelic Sediments From The Marmara Sea: A Biostratigraphic Approach To Palaeoceanographic History During The Last Glacial-Holocene, Elmas Kirci Elmas, Oya Algan, İzver Özkar Öngen, Ulrich Struck, Alexander V. Altenbach, Eni̇s K. Sagular, Ati̇ke Nazi̇k
Palaeoenvironmental Investigation Of Sapropelic Sediments From The Marmara Sea: A Biostratigraphic Approach To Palaeoceanographic History During The Last Glacial-Holocene, Elmas Kirci Elmas, Oya Algan, İzver Özkar Öngen, Ulrich Struck, Alexander V. Altenbach, Eni̇s K. Sagular, Ati̇ke Nazi̇k
Turkish Journal of Earth Sciences
High-resolution micropalaeontological examination of two cores recovered from the Central Basin of the Marmara Sea distinguishes seven biostratigraphical zones within pre-sapropelic (Pr1 & 2 zones), sapropelic (Sap1 & 2 zones) and post-sapropelic (Po1-2-3 zones) sediments. The pre-sapropelic sediments at the basal section of the cores reflect the lake stage of the Marmara Sea when it was isolated both from the Black and Mediterranean seas. First colonization of foraminifers at about 11-10.4 ky BP indicate the beginning of marine conditions following the entry of Mediterranean waters through the Çanakkale Strait. Sapropelic sediments deposited at about 10.3-6.2 ky BP were associated with …
Petrology And ^{40}Ar-^{39}Ar Age Of The Bimodal Orduzu Volcanics (Malatya) From The Western End Of The Eastern Anatolian Neogene Volcanism, Turkey, Ayten Önal, Durmuş Boztuğ, Mehmet Arslan, Terry L. Spell, Sevcan Kürüm
Petrology And ^{40}Ar-^{39}Ar Age Of The Bimodal Orduzu Volcanics (Malatya) From The Western End Of The Eastern Anatolian Neogene Volcanism, Turkey, Ayten Önal, Durmuş Boztuğ, Mehmet Arslan, Terry L. Spell, Sevcan Kürüm
Turkish Journal of Earth Sciences
The Orduzu volcanics, which are part of the Yamadağ volcanics in the Malatya region, include rhyolite, rhyolitic dykes, trachyandesite and basaltic trachyandesitic dykes. Mafic globular occurrences within the basaltic trachyandesitic dykes, the existence of basaltic trachyandesite enclaves within the trachyandesite, and other textural and geochemical evidence all indicate magma mingling/mixing. Incremental ^{40}Ar-^{39}Ar dating on plagioclase from the rhyolite, from rhyolite dykes and basaltic trachyandesite yielded consistently 16 Ma (Middle Miocene). Primordial mantle-normalized spider diagrams of the rhyolite and rhyolitic dykes represent enrichments in some large ion lithophile elements (Cs, Rb, Ba, K, Th, U) but remarkably depletion in Sr, Nb, …
A First Record Of A Strike-Slip Basin In Western Anatolia And Its Tectonic Implication: The Cumaovası Basin, Bora Uzel, Hasan Sözbi̇li̇r
A First Record Of A Strike-Slip Basin In Western Anatolia And Its Tectonic Implication: The Cumaovası Basin, Bora Uzel, Hasan Sözbi̇li̇r
Turkish Journal of Earth Sciences
The Cumaovası basin, formerly known as the Çubukludağ Graben, is located at the western end of Gediz and Küçük Menderes grabens in the west Anatolian extensional province. It is 5-17-km wide and 35-km-long, NNE-SSW-trending, asymmetric basin that was formed under the control of strike-slip and oblique-slip normal faults. The basin contains two different infills that are separated by an angular unconformity: (1) an ancient basin fill consisting of Lower Miocene-Lower Pliocene sequences which accumulated in a fluvio-lacustrine depositional setting, and deformed by NE-SW-trending strike-slip faulting; and (2) a modern basin fill consisting of Plio-Quaternary units that are controlled by synchronous …
New Chemical Weathering Indices For Estimating The Mechanical Properties Of Rocks: A Case Study From The Kürtün Granodiorite, Ne Turkey, Şener Ceryan
Turkish Journal of Earth Sciences
The chemical weathering of rock proceeds by water-rock interaction. During weathering geochemically mobile elements, alkali and alkali-earth elements are easily leached from rocks, leaving the residual elements to combine with components from the atmosphere to form new minerals. No single weathering index given in the literature fits the model of the process involved in chemical weathering outlined above. This study deals with the derivation of three new chemical weathering indices by taking both chemical processes such as leaching and new mineral formation into account. The new indices are chemical leaching index (CLI), chemical weathering product index (CWPI) and total chemical …
Timidonella? Primitiva N. Sp. (Foraminiferida) From The Middle Jurassic Of The Eastern Taurides (Southern Turkey): Remarks On Evolutionary Steps Of Hauraniids, Erkan Ekmekci̇, Demi̇r Altiner
Timidonella? Primitiva N. Sp. (Foraminiferida) From The Middle Jurassic Of The Eastern Taurides (Southern Turkey): Remarks On Evolutionary Steps Of Hauraniids, Erkan Ekmekci̇, Demi̇r Altiner
Turkish Journal of Earth Sciences
A new species of complex benthic foraminifera, Timidonella? primitiva n.sp., has been identified from the Aalenian?-Bajocian of the eastern Taurides, Turkey. The new species, belonging to the family Hauraniidae SEPTFONTAINE, occurs in the lowermost beds of the Köroğlutepesi Formation and its test is composed of a planispirally coiled early stage followed by an uncoiled rectilinear portion. The internal structure is characterized by four different zones consisting of a subepidermal reticulate layer, a zone of subepidermal plates, a more internal empty zone in the chambers and a primitive interseptal pillar system in the most internal part of the chambers perforated by …
Sr And Nd Isotopic Characteristics Of Some S-, I- And A-Type Granitoids From Central Anatolia, Serhat Köksal, M. Cemal Göncüoğlu
Sr And Nd Isotopic Characteristics Of Some S-, I- And A-Type Granitoids From Central Anatolia, Serhat Köksal, M. Cemal Göncüoğlu
Turkish Journal of Earth Sciences
The petrogenesis of some Late Cretaceous S-, I- and A-type granitoids in the Aksaray and Kırşehir regions of Central Anatolia is investigated by means of whole-rock Sr and Nd isotope data with supplementary field, petrographic, and whole-rock geochemical studies. The S-type Central Anatolian granitoids (Sinandı and Namlıkışla) have calc-alkaline peraluminous characteristics and show LILE and LREE enrichment. The I-type Central Anatolian granitoids (Borucu, Terlemez, Hisarkaya, Baranadağ), on the other hand, are calc-alkaline (excepting the alkaline Baranadağ sample) and metaluminous or slightly peraluminous with LILE and LREE enriched patterns and variable Eu-anomalies. Additionally, the A-type Çamsarı granitoid is alkaline and metaluminous …
Crustal Structure Of The Eastern Part Of Central Anatolia (Turkey), Hüseyi̇n Yilmaz, Sevda Özel
Crustal Structure Of The Eastern Part Of Central Anatolia (Turkey), Hüseyi̇n Yilmaz, Sevda Özel
Turkish Journal of Earth Sciences
This study aims to examine crustal structure in the eastern part of central Anatolia using the magnetotelluric (MT) method. MT data have been collected from 37 stations along a north-south 220 km profile crossing in succession the Tokat Massif (Pontide basement), the Ankara-Erzincan Suture Zone, the Kırşehir Massif, the Pınarbaşı-Divriği Ophiolitic Belt and the Tauride-Anatolide Belt. Data were modelled to derive a geo-electrical model using 2-dimensional inverse techniques. Low resistivity values (981 Ohm.m) coincide with the southern part of the Pontide Magmatic Arc, the Kırşehir Block and the Tauride-Anatolide Belt and are interpreted as upper crust of igneous and metamorphic …
The Geochemistry And Setting Of The Demirci Paragneisses Of The Sünnice Massif, Nw Turkey, Erdi̇nç Yi̇ği̇tbaş, John A. Winchester, Christopher J. Ottley
The Geochemistry And Setting Of The Demirci Paragneisses Of The Sünnice Massif, Nw Turkey, Erdi̇nç Yi̇ği̇tbaş, John A. Winchester, Christopher J. Ottley
Turkish Journal of Earth Sciences
The Demirci migmatitic quartzofeldspathic gneisses of the Sünnice Massif, exposed in the İstanbul Zone north of Bolu, have compositions that show them to be paragneisses, associated with subordinate para-amphibolites. They consist principally of metamorphosed, rather calcareous greywackes, with sediment derived from a continental arc source. They occur in the para-autochthon below a nappe pile (Çele meta-ophiolite), deformed and subjected to amphibolite facies metamorphism before the emplacement of late Neoproterozoic metavolcanic rocks later subjected to greenschist-facies metamorphism (Yellice volcanics). As they are overlain in sequence by nappes comprising sections of the Çele meta-ophiolite with ocean floor basalt and island arc tholeiite …
Ankara Orogenic Phase, Its Age And Transition From Thrusting-Dominated Paleotectonic Period To The Strike-Slip Neotectonic Period, Ankara (Turkey), Ali̇ Koçyi̇ği̇t, Şule Deveci̇
Ankara Orogenic Phase, Its Age And Transition From Thrusting-Dominated Paleotectonic Period To The Strike-Slip Neotectonic Period, Ankara (Turkey), Ali̇ Koçyi̇ği̇t, Şule Deveci̇
Turkish Journal of Earth Sciences
The Ankara section of the İzmir-Ankara-Erzincan Suture Zone (IAESZ) is characterized by two major groups of contractional structures, namely the Ankara forced folds-monoclines and the southward-verging foreland fold-imbricate thrust to reverse fault zone (AFITFZ). In the Ankara region, one of the areas where the various phases of deformation and related structures are particularly well-preserved and exposed is the Edige (Elmadağ) area, 48 km east-southeast of the city of Ankara. The youngest palaeotectonic unit in the AFITFZ, and deformed in the last phase of the palaeotectonic period (the Ankara orogenic phase) is the Edige formation. It consists of a fluvio-lacustrine sedimentary …
The R/V Meteor Cruise Leg M44/1 In February 1999 In The Sea Of Marmara: The First Multibeam Bathymetric Study And Analysis Of Methane In Sediment And Water Columns, İsmai̇l Kuşçu, Peter Halbach, Maik Inthorn, Thomas Kuhn, Richard Seifert
The R/V Meteor Cruise Leg M44/1 In February 1999 In The Sea Of Marmara: The First Multibeam Bathymetric Study And Analysis Of Methane In Sediment And Water Columns, İsmai̇l Kuşçu, Peter Halbach, Maik Inthorn, Thomas Kuhn, Richard Seifert
Turkish Journal of Earth Sciences
During the first leg of R/V Meteor cruise M44 in February 1999, geoscientific studies in two areas in the Sea of Marmara were carried out. The studies mainly focused on cool fluid and gas (mainly methane) emanations in the deepest zones of the Sea of Marmara along the northern strand of the North Anatolian Fault Zone, which were particularly expected because of the availability of fault zones as a preferential pathway for fluid migration. Fluids and gases both within the pore water and the benthic water were investigated through long cores and water samples to reveal their relationship with the …
Timing Of The Quaternary Elazığ Volcanism, Eastern Turkey, And Its Significance For Constraining Landscape Evolution And Surface Uplift, Ali̇ Seyrek, Rob Westaway, Malcolm Pringle, Sema Yurtmen, Tuncer Demi̇r, George Rowbotham
Timing Of The Quaternary Elazığ Volcanism, Eastern Turkey, And Its Significance For Constraining Landscape Evolution And Surface Uplift, Ali̇ Seyrek, Rob Westaway, Malcolm Pringle, Sema Yurtmen, Tuncer Demi̇r, George Rowbotham
Turkish Journal of Earth Sciences
The eastern part of the Anatolian plateau in eastern Turkey has experienced dramatic landscape evolution in the Late Cenozoic, surface uplift having been associated with the disruption of former lake basins and the development of the modern high-relief landscape, incised by the upper reaches of the River Euphrates and its major tributary, the Murat. Overall, the altitude of the plateau decreases gradually westward, and it has been assumed that uplift on any given timescale has varied regionally in a similar manner. However, using the Ar-Ar method, we have dated an episode of basaltic volcanism around the city of Elazığ to …
Thematic Set: Active Tectonics And Earthquake Hazard Of Western Anatolia -- Preface, Hasan Sözbi̇li̇r, Serdar Akyüz, Erhan Altunel, Hali̇l Gürsoy
Thematic Set: Active Tectonics And Earthquake Hazard Of Western Anatolia -- Preface, Hasan Sözbi̇li̇r, Serdar Akyüz, Erhan Altunel, Hali̇l Gürsoy
Turkish Journal of Earth Sciences
No abstract provided.
Isostatic Compensation In Western Anatolia With Estimate Of The Effective Elastic Thickness, Oya Pamukçu, Ayça Yurdakul
Isostatic Compensation In Western Anatolia With Estimate Of The Effective Elastic Thickness, Oya Pamukçu, Ayça Yurdakul
Turkish Journal of Earth Sciences
Isostasy is concerned with how the crust and mantle adjusts to shifting loads of limited spatial and temporal dimensions. By analysing the frequency content of gravity and topography data, it has been possible to determine the compensation scheme of a region. In this study, the compensation mechanism of the Western Anatolia, which has dynamic loads, was investigated by isostatic response functions. Effective elastic thickness in Western Anatolia region was estimated based on admittance and coherence between gravity and topography data. The two most reliable indicators of lithospheric strength are the focal depth distribution of earthquakes and relation of gravity anomalies …
Earthquake Hazard Of The Aegean Extension Region (West Turkey), Orhan Polat, Elçi̇n Gök, Doğuser Yilmaz
Earthquake Hazard Of The Aegean Extension Region (West Turkey), Orhan Polat, Elçi̇n Gök, Doğuser Yilmaz
Turkish Journal of Earth Sciences
West Turkey, one of the most seismically active regions of Turkey, has been analysed to reveal seismic hazard by using fractal behaviour, seismic quiescence z- and Gutenberg-Richter b-parameters. Starting from raw earthquake catalogue, we performed completeness analysis on recorded events, and a final catalogue, could be accepted as homogeneous, was obtained. According to the results obtained from the Frequency-Magnitude Distribution (FMD), seismic activity rates (b- and z-values) and fractal correlation dimension, we detected three anomalous zones throughout the Aegean Extension Region (AER). These are: (1) Çandarlı Bay and Bergama-Zeytindağ Fault Zone, (2) İzmir fault and Orhanlı Fault Zone, and (3) …
In Memoriam Jean Philippe Marcoux, A.M. Celal Şengör
In Memoriam Jean Philippe Marcoux, A.M. Celal Şengör
Turkish Journal of Earth Sciences
No abstract provided.
Stratigraphic And Structural Evidence For Fault Reactivation: The Active Manisa Fault Zone, Western Anatolia, Çağlar Özkaymak, Hasan Sözbi̇li̇r
Stratigraphic And Structural Evidence For Fault Reactivation: The Active Manisa Fault Zone, Western Anatolia, Çağlar Özkaymak, Hasan Sözbi̇li̇r
Turkish Journal of Earth Sciences
In this paper, we aim to present stratigraphic and structural evidence for fault reactivation that is linked with evolution of the western part of the Manisa fault zone - a major range-bounding fault that is geomorphologically expressed as a trace of north-facing scarps bounding the southern margin of the Manisa basin which is subsidiary to the Gediz Graben. We identify that the Manisa fault zone, at its western end, consists of three fault segments which are en échelon arranged in left step. Each segment is identified as steep topographic scarps visible on topographic maps and in landsat images. Fault scarps …
The Ampullinid Gastropod Globularia (Swainson 1840) From The Late Thanetian-Early Ilerdian Kırkkavak Formation (Polatlı-Ankara) Of The Tethyan Realm, Yavuz Okan, İzzet Hoşgör
The Ampullinid Gastropod Globularia (Swainson 1840) From The Late Thanetian-Early Ilerdian Kırkkavak Formation (Polatlı-Ankara) Of The Tethyan Realm, Yavuz Okan, İzzet Hoşgör
Turkish Journal of Earth Sciences
Ampullinid gastropods are useful in correlating the Palaeogene marine strata of Central Anatolia. Ampullinid gastropods are found in the Late Paleocene-Early Eocene Kırkkavak Formation in the Macunköy area (Polatlı, west of Ankara). In the Haymana-Polatlı Basin, a variety of Globularia (Swainson 1840) species is described from the upper part of the Kırkkavak Formation, including G. sireli n.sp. The other taxa are G. vapincana (d´Orbigny 1850), G. grossa (Deshayes 1864) and G. crassatina (Lamarck 1804). The Kırkkavak fauna is known in western and central Europe, and central Asia. Some of the ampullinid gastropods and associated cerithid and neritid gastropods as well …
Yo-Yo Tectonics Of The Niğde Massif During Wrenching In Central Anatolia, Donna L. Whitney, Paul J. Umhoefer, Christian Teyssier, Annia K. Fayon
Yo-Yo Tectonics Of The Niğde Massif During Wrenching In Central Anatolia, Donna L. Whitney, Paul J. Umhoefer, Christian Teyssier, Annia K. Fayon
Turkish Journal of Earth Sciences
Yo-yo tectonics occurs in wrench zones in response to switches between transpression and transtension or to changes in the geometries of faults during these modes of deformation, and involves multiple cycles of burial and exhumation. The Niğde Massif, Turkey, is a spectacular example of a tectonic yo-yo: it experienced two complete cycles of burial and exhumation in a zone of oblique displacement. The two cycles, one regional and one more local in scale, together occurred over > 80 m.y., from Cretaceous burial to Miocene cooling and exhumation. Temperature-time paths calculated using apatite fission track age and length data, combined with published …
Magma Interaction Processes Inferred From Fe-Ti Oxide Compositions In The Dölek And Sarıçiçek Plutons, Eastern Turkey, Orhan Karsli, Faruk Aydin, İbrahi̇m Uysal, M. Burhan Sadiklar
Magma Interaction Processes Inferred From Fe-Ti Oxide Compositions In The Dölek And Sarıçiçek Plutons, Eastern Turkey, Orhan Karsli, Faruk Aydin, İbrahi̇m Uysal, M. Burhan Sadiklar
Turkish Journal of Earth Sciences
Magnetite-ulvöspinel and ilmenite-hematite solid solution intergrowths from the high-K calc-alkaline Dölek and Sarıçiçek plutons, Eastern Turkey, were investigated using microprobe analyses. Compositions of twenty-eight samples from the host rocks and their enclaves in the plutons were used to estimate the oxygen fugacity and temperature. The ilmenite and ulvöspinel component exsolves out along certain preferred crystallographic planes in the titanomagnetite of the host rocks, while they are always absent in those of the mafic microgranular enclaves. The titanomagnetite and ilmenite show variations as Mt_{98-70}Usp_{02-30} and Ilm_{99-65}Hm_{01-35} in composition, respectively. Estimations of oxygen fugacity and temperature using the titanomagnetite-ilmenite thermometry/oxygen barometry range …