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- Turkey (12)
- Eastern Pontides (5)
- Central Anatolia (3)
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- Eastern Anatolia (2)
- Kaman-Kırşehir region (2)
- Mineral chemistry (2)
- Ophiolite (2)
- Single zircon ^{207}Pb-^{206}Pb (2)
- A-type granite (1)
- Alkaline volcanics (1)
- Alterations (1)
- Amphibole ^{40}Ar-^{39}Ar (1)
- Attenuation relationship (1)
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- Bedrock depth (1)
- Benthic fauna (1)
- Benthonic foraminifera (1)
- Bey Dağları carbonate platform (1)
- Biostratigraphy (1)
- Biotite ^{40}Ar-^{39}Ar (1)
- Bivalvia (1)
- Bouguer gravity (1)
- Calc alkaline (1)
- Calc-alkaline volcanics (1)
- Central Pontides (1)
- Clay minerals (1)
- Clinopyroxene (1)
- Coastal dune (1)
Articles 1 - 28 of 28
Full-Text Articles in Physical Sciences and Mathematics
^{207}Pb-^{206}Pb, ^{40}Ar-^{39}Ar And Fission-Track Geothermochronology Quantifying Cooling And Exhumation History Of The Kaman-Kırşehir Region Intrusions, Central Anatolia, Turkey, Durmuş Boztuğ, Özlem Güney, Matt Heizler, Raymond J. Jonckheer, Marion Tichomirowa, Nazmi̇ Otlu
^{207}Pb-^{206}Pb, ^{40}Ar-^{39}Ar And Fission-Track Geothermochronology Quantifying Cooling And Exhumation History Of The Kaman-Kırşehir Region Intrusions, Central Anatolia, Turkey, Durmuş Boztuğ, Özlem Güney, Matt Heizler, Raymond J. Jonckheer, Marion Tichomirowa, Nazmi̇ Otlu
Turkish Journal of Earth Sciences
The Kaman-Kırşehir region intrusions were generated in a post-collisional extensional setting following Cenomanian-Turonian docking of an oceanic island arc, comprising the supra-subduction zone (SSZ) Central Anatolian ophiolite (CAO), onto the Tauride-Anatolide Platform (TAP). These granitoids have been named, from N to S, the Çamsarı quartz syenite, Hamit quartz syenite, Bayındır nepheline-cancrinite syenite, Durmuşlu nepheline-nosean-melanite syenite porphyry and Baranadağ quartz monzonite. They intrude the crustal metasediments of the Central Anatolian Crystalline Complex (CACC) and CAO and are unconformably overlain by Upper Paleocene to Lower-Middle Eocene sediments. The single-zircon ^{207}Pb-^{206}Pb evaporation age of the Çamsarı unit is 95.7±5.1 Ma; those of the …
^{207}Pb-^{206}Pb, ^{40}Ar-^{39}Ar And Apatite Fission-Track Geothermochronology Revealing The Emplacement, Cooling And Exhumation History Of The Karaçayır Syenite (N Sivas), East-Central Anatolia, Turkey, Durmuş Boztuğ, Esra Türksever, Matt Heizler, Raymond J. Jonckheer, Marion Tichomirowa
^{207}Pb-^{206}Pb, ^{40}Ar-^{39}Ar And Apatite Fission-Track Geothermochronology Revealing The Emplacement, Cooling And Exhumation History Of The Karaçayır Syenite (N Sivas), East-Central Anatolia, Turkey, Durmuş Boztuğ, Esra Türksever, Matt Heizler, Raymond J. Jonckheer, Marion Tichomirowa
Turkish Journal of Earth Sciences
The Karaçayır syenite, intruding the Palaeozoic crustal metamorphics and unconformably overlain by Upper Paleocene to Eocene Tokuş formation in the north of Sivas (east-central Anatolia), has been studied with respect to ^{207}Pb-^{206}Pb single zircon evaporation, biotite ^{40}Ar-^{39}Ar, and apatite fission-track geothermochronology. ^{207}Pb-^{206}Pb single zircon evaporation dating yields an age of 99.0±11.0 Ma (Cenomanian-Turonian) which is considered to be the intrusion age. Biotite ^{40}Ar-^{39}Ar age determination gives a cooling age of ca. 65 Ma. Apatite fission-track dating, combined with T-t modeling based on track-length distribution data, determines a fast tectonic exhumation with an uplift rate of > 1 mm/a which occurred 58-61 …
Mineral Chemistry And Petrochemistry Of Post-Collisional Tertiary Mafic To Felsic Cogenetic Volcanics In The Ulubey (Ordu) Area, Eastern Pontides, Ne Turkey, İrfan Temi̇zel, Mehmet Arslan
Mineral Chemistry And Petrochemistry Of Post-Collisional Tertiary Mafic To Felsic Cogenetic Volcanics In The Ulubey (Ordu) Area, Eastern Pontides, Ne Turkey, İrfan Temi̇zel, Mehmet Arslan
Turkish Journal of Earth Sciences
Post-collisional Tertiary volcanic rocks in the Ulubey (Ordu) area at the western edge of the eastern Pontides palaeo-arc are divided into four suites. The Yenisayaca basalt (TB) contains plagioclase (An_{61-83}), clinopyroxene (Wo_{42-44}En_{39-41}Fs_{15-18}) and olivine phenocrysts and titanomagnetite microphenocrysts, whereas the Çatal Tepe and Elekçioğlu Tepe suite (ÇES), Işık Tepe suite (ITS) and andesite/ trachyandesite suite (ATS) rocks include plagioclase (An_{23-78}), clinopyroxene (Wo_{27-48}En_{37-55}Fs_{11-26}), hornblende (Mg#= 0.63-0.76), biotite (Mg#= 0.63-0.82), sanidine phenocrysts and titanomagnetite and apatite microphenocrysts. Petrochemically, the volcanic rocks show tholeiitic-alkaline to the calc-alkaline affinities, and have medium to high-K contents. Most samples have low Mg#, Cr, and Ni, which …
Bedrock Depth Mapping Of The Coast South Of İstanbul: Comparison Of Analytical And Experimental Analyses, Gülüm Bi̇rgören, Oğuz Özel, Bi̇lge Si̇yahi̇
Bedrock Depth Mapping Of The Coast South Of İstanbul: Comparison Of Analytical And Experimental Analyses, Gülüm Bi̇rgören, Oğuz Özel, Bi̇lge Si̇yahi̇
Turkish Journal of Earth Sciences
Local S-wave velocity-depth profiles and bedrock depth distribution are key factors in assessing seismic hazard and earthquake ground motion characteristics since they allow determination of the amplification potential of geological formations overlying bedrock. In this study, an empirical relationship between the thickness of Tertiary-Quaternary sediments (hereafter referred as cover) overlying Palaeozoic bedrock and their resonance frequencies was calculated for the İstanbul region and the bedrock depth distribution beneath the city was presented. The relationship was investigated by comparing transfer functions obtained from single station microtremor analyses and one-dimensional (1D) S-wave velocity profiles at sites where shallow velocity structure is known. …
Crustal Thermal Properties Of The Central Pontides (Northern Turkey) Deduced From Spectral Analysis Of Magnetic Data, Nafi̇z Maden
Crustal Thermal Properties Of The Central Pontides (Northern Turkey) Deduced From Spectral Analysis Of Magnetic Data, Nafi̇z Maden
Turkish Journal of Earth Sciences
The Pontides can be divided tectonically into three main sectors: Eastern, Central, and Western Pontides. Each of these represents an amalgamated tectonic mosaic consisting of remnants of oceanic, continental, and island arc segments. The Eastern and the Western Pontides meet in the Central Pontides, where they are structurally mixed and form a tectonic knot. The Central Pontides of northern Turkey is one of the best exposed segments of the southern margin of Eurasia adjacent to the Tethys Ocean. The study area also extends to parts of the Sakarya and Kırşehir continents. Magnetic spectral analysis, which has been used to estimate …
Permian Trilobites From Antalya Province, Turkey, And Enrollment In Late Palaeozoic Trilobites, Rudy Lerosey Aubril, Lucia Angiolini
Permian Trilobites From Antalya Province, Turkey, And Enrollment In Late Palaeozoic Trilobites, Rudy Lerosey Aubril, Lucia Angiolini
Turkish Journal of Earth Sciences
Trilobites are a minor component of Permian benthic marine faunas, which explains why they remain poorly known. For example, only two specimens have been found in the highly fossiliferous and extensively studied Middle-Upper Permian Pamucak Formation (Antalya Province, Turkey). These two complete enrolled trilobites of Wordian age are described herein. The diagnosis of the subgenus Pseudophillipsia (Nodiphillipsia) Kobayashi & Hamada 1984a is emended and its occurrence outside of eastern Asia is reported for the first time. The second specimen represents a new species, Pseudophillipsia (Carniphillipsia) kemerensis sp. nov. Its discovery in the Wordian of Turkey suggests that Pseudophillipsia (Carniphillipsia) is …
Geochemical And Mineralogical Characteristics Of Fe-Ni Laterite Ore Of Sarıçimen (Çaldıran-Van) Area In Eastern Anatolia, Turkey, Ali̇ Riza Çolakoğlu
Geochemical And Mineralogical Characteristics Of Fe-Ni Laterite Ore Of Sarıçimen (Çaldıran-Van) Area In Eastern Anatolia, Turkey, Ali̇ Riza Çolakoğlu
Turkish Journal of Earth Sciences
The Sarıçimen Fe-Ni laterite ore is located 15 km east of Çaldıran County, northeast of Lake Van. This area is situated in the eastern Anatolia accretionary complex of Turkey, close to the Iran boundary. It is the first transported Fe-Ni rich laterite to be described from this area. This paper concentrates on the mineralogical and textural features of the ore minerals and the transported Fe-Ni laterite zone. These transported laterites are very inhomogeneous and contain very abundant zoned chromite grains, which have been altered to magnetite. SEM/probe investigations indicate that Fe-Ni is depleted in the core chromite and increases in …
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 …
Geochemical Characteristics Of Mafic And Intermediate Volcanic Rocks From The Hasandağ And Erciyes Volcanoes (Central Anatolia, Turkey), Aykut Güçteki̇n, Nezi̇hi̇ Köprübaşi
Geochemical Characteristics Of Mafic And Intermediate Volcanic Rocks From The Hasandağ And Erciyes Volcanoes (Central Anatolia, Turkey), Aykut Güçteki̇n, Nezi̇hi̇ Köprübaşi
Turkish Journal of Earth Sciences
Hasandağ and Erciyes stratovolcanoes, which are the two important stratovolcanoes in Central Anatolia, erupted volcanic products with both calc-alkaline and alkaline compositions, although the calc-alkaline activity is more widespread. There are three stages of geochemical evolution in the history of the Hasandağ stratovolcanic complex: (1) Keçikalesi tholeiitic volcanism, (2) Hasandağ calc-alkaline volcanism, and (3) Hasandağ alkaline volcanism. The geochemical evolution of Erciyes volcanic complex also exhibits three distinct evolutionary stages: (1) Koçdağ alkaline volcanism, (2) Koçdağ calc-alkaline volcanism and (3) Erciyes calc-alkaline volcanism. The volcanic rocks from both suites show enrichments in LREE relative to HREE. The rocks as a …
Whole Rock And Mineral Chemistry Of Ultramafic-Mafic Cumulates From The Orhaneli (Bursa) Ophiolite, Nw Anatolia, Ender Sarifakioğlu, Hayretti̇n Özen, John A. Winchester
Whole Rock And Mineral Chemistry Of Ultramafic-Mafic Cumulates From The Orhaneli (Bursa) Ophiolite, Nw Anatolia, Ender Sarifakioğlu, Hayretti̇n Özen, John A. Winchester
Turkish Journal of Earth Sciences
The Orhaneli ophiolite, situated in the western part of the İzmir-Ankara-Erzincan Suture Zone (İAESZ) and south of Bursa, exposes cumulates belonging to the mantle-crust transition zone. The Orhaneli ophiolite consists mainly of ultramafic cumulates and subordinate mafic cumulates. The basal cumulate sequence comprises dunites locally interlayered with chromitite levels. Above, dunitic cumulates, commonly interbanded with cumulate wehrlites, grade up into two pyroxene peridotites (cumulate lherzolites showing some transition to cumulate harzburgites in places). The observation of cumulate gabbroic thin layers intercalated with ultramafic cumulates at least three times suggests that the magma chamber was periodically replenished by basaltic liquids. Petrographic …
Lead And Sulfur Isotope Studies Of The Koru (Çanakkale, Turkey) Lead-Zinc Deposits, Gülcan Bozkaya, Ahmet Gökçe
Lead And Sulfur Isotope Studies Of The Koru (Çanakkale, Turkey) Lead-Zinc Deposits, Gülcan Bozkaya, Ahmet Gökçe
Turkish Journal of Earth Sciences
Koru (Çanakkale) barite-bearing lead-zinc deposits are typical examples of the lead-zinc deposits occurring in the Tertiary volcanic rocks which crop out in the Biga Peninsula. Volcanic rocks around the investigated deposits are distinguished as Eocene Akçaalan andesite, Oligocene Adadağı pyroclastics, Miocene Dededağ dacite and Plio-Quaternary Karaömerler basalt. The investigated deposits are hosted by Adadağı pyroclastics and show two different mineralization styles such as stockwork ore veinlets in the upper parts and ore veins along the fault zones in WNW-ESE direction, in the lower parts. Sphalerite, galena, pyrite, chalcopyrite, quartz, barite and calcite are the main minerals and they are accompanied …
Alteration Mineralogy And Geochemistry Of The Hydrothermally Altered Rocks Of The Kutlular (Sürmene) Massive Sulfide Deposit, Ne Turkey, Emel Abdi̇oğlu, Mehmet Arslan
Alteration Mineralogy And Geochemistry Of The Hydrothermally Altered Rocks Of The Kutlular (Sürmene) Massive Sulfide Deposit, Ne Turkey, Emel Abdi̇oğlu, Mehmet Arslan
Turkish Journal of Earth Sciences
Volcanogenic massive sulfide deposits accompanying the Upper Cretaceous felsic rocks in the intra-arc rift zone of the Pontide palaeo-arc are common in the NE Turkey. One of them, the Kutlular (Sürmene, Trabzon) deposit, is an abandoned mine within the Upper Cretaceous mafic, felsic volcanics and subvolcanic rocks. Detailed mineralogical and geochemical studies indicate the presence of hydrothermal alteration zones around the Kutlular deposit; these alteration zones are represented by silicification-pyrite-illite zone, illite-silicification zone, illite/smectite-silicification zone, smectite zone accompanying kaolinite and halloysite in the dacitic pyroclastics, and additionally chlorite zone in the mafic volcanics. Lithogeochemical data indicate that the footwall dacitic …
Compositional Variations, Zoning Types And Petrogenetic Implications Of Low-Pressure Clinopyroxenes In The Neogene Alkaline Volcanic Rocks Of Northeastern Turkey, Faruk Aydi̇n, Orhan Karsli, M. Burhan Sadiklar
Compositional Variations, Zoning Types And Petrogenetic Implications Of Low-Pressure Clinopyroxenes In The Neogene Alkaline Volcanic Rocks Of Northeastern Turkey, Faruk Aydi̇n, Orhan Karsli, M. Burhan Sadiklar
Turkish Journal of Earth Sciences
Clinopyroxene phenocrysts and microphenocrysts in different series of the Neogene alkaline volcanic rocks from the eastern Pontides (NE Turkey) record various stages in the crystallization conditions and evolution history of the alkaline melt as well as its origin. Crystal chemical studies reveal that the clinopyroxenes in each rock series show strong textural and compositional similarities, which all reflect a common petrogenetic affinity. They have relatively high Mg-numbers (0.68-0.95), variable Al_2O_3 (1.3-9.6 wt%), low TiO_2 (
Petrogenesis Of The Refahiye Ophiolite And Its Tectonic Significance For Neotethyan Ophiolites Along The İzmir-Ankara-Erzincan Suture Zone, Ender Sarifakioğlu, Hayretti̇n Özen, John A. Winchester
Petrogenesis Of The Refahiye Ophiolite And Its Tectonic Significance For Neotethyan Ophiolites Along The İzmir-Ankara-Erzincan Suture Zone, Ender Sarifakioğlu, Hayretti̇n Özen, John A. Winchester
Turkish Journal of Earth Sciences
The Refahiye ophiolite, situated near Erzincan in the eastern part of the İzmir-Ankara-Erzincan Suture Zone (İAESZ), is one of the best exposures of oceanic lithosphere in the northern branch of the Neotethyan Ocean. The ophiolite, mainly thrust southwards, transported on an ophiolitic mélange, over the Early Triassic-Campanian Munzur Limestone of the Anatolide-Tauride Platform, was also emplaced by north-directed backthrusting onto the Pontides in the Late Cretaceous. It displays an almost complete ophiolite series unconformably overlain by Tertiary volcano-sedimentary units. The mantle peridotites are dominated by harzburgites, with dunite bands and lenses locally cut by isolated diabase dykes, whereas the mafic-ultramafic …
The Relationship Between The Tectonic Setting Of The Lake İznik Basin And The Middle Strand Of The North Anatolian Fault, Kurultay Öztürk, Cenk Yaltirak, Bedri̇ Alpar
The Relationship Between The Tectonic Setting Of The Lake İznik Basin And The Middle Strand Of The North Anatolian Fault, Kurultay Öztürk, Cenk Yaltirak, Bedri̇ Alpar
Turkish Journal of Earth Sciences
The İznik Basin is an active depression created by a series of faults developed in relation to the Middle Strand of the North Anatolian Fault (NAFMS). The most important of these faults is the oblique Sölöz fault, which runs parallel to the NAFMS. It is interpreted as a releasing bend, and plays a crucial role in the evolution of the 75-m-deep ellipsoid-shaped depression in the southern part of the lake. The faults that limit the coastal alluvial plain on land, some of which developed during the early evolution of the NAFMS, are equally important in the development of the İznik …
Two-And-Three-Dimensional Crustal Thickness Of The Eastern Pontides (Ne Turkey), Nafiz Maden, Kenan Geli̇şli̇, Yener Eyüboğlu, Osman Bektaş
Two-And-Three-Dimensional Crustal Thickness Of The Eastern Pontides (Ne Turkey), Nafiz Maden, Kenan Geli̇şli̇, Yener Eyüboğlu, Osman Bektaş
Turkish Journal of Earth Sciences
The Eastern Pontide orogenic belt is divided into three subzones (northern, southern and axial zones) based on present lithologies and facies associations. NE-SW-, NW-SE- and E-W-trending fault systems, which play an important role in palaeotectonics and neotectonics of the Eastern Pontides, separate these zones. Three different methods were used to estimate the Moho depth from observed gravity value, namely (i) empirical relationship between Moho depth and Bouguer anomaly; (ii) spectral analysis of the radial wave number and; (iii) by the gravity inversion method. Power spectrum, a statistical approach, is a widely used technique to determine the depth of geological sources …
Anomalous Strong Reflections On High Resolution Seismic Data From The Turkish Shelf Of The Eastern Black Sea: Possible Indicators Of Shallow Hydrogen Sulphide-Rich Gas Hydrate Layers, Derman Dondurur, Günay Çi̇fçi̇
Anomalous Strong Reflections On High Resolution Seismic Data From The Turkish Shelf Of The Eastern Black Sea: Possible Indicators Of Shallow Hydrogen Sulphide-Rich Gas Hydrate Layers, Derman Dondurur, Günay Çi̇fçi̇
Turkish Journal of Earth Sciences
Some strong reflections about 3 to 5 m thick were observed at depths of 25-60 metres below the sea floor using deep-towed, 5 kHz subbottom profiler data in the Turkish shelf and upper slope of the Eastern Black Sea at water depths of 250 to 700 m. Strong reflections of this kind are generally attributed to shallow and localized gas accumulations. We, however, observed that the reflection polarity of these strong reflections was positive, suggesting that they do not correspond to reflections from the upper boundary of a possible gas front. In this study, we evaluate these reflections to determine …
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 …
Cross-Basin Faulting And Extinction Of Pull-Apart Basins In The Sea Of Marmara, Nw Turkey, İsmai̇l Kuşçu
Cross-Basin Faulting And Extinction Of Pull-Apart Basins In The Sea Of Marmara, Nw Turkey, İsmai̇l Kuşçu
Turkish Journal of Earth Sciences
Although offshore multi-channel seismic reflection and multi-beam bathymetric studies were intensively carried out in the Sea of Marmara especially after the August 17, 1999 İzmit earthquake (Mw 7.4), some basic problems remain unsolved, for example whether the seafloor was cut by a double fault system or just by a single fault. The researchers advocating the double fault system assumed that most of the deformation occurred along the margins of the basins and concluded that the classical model of pull-apart basin formation along releasing bends or stepovers within an east−west-trending dextral strike-slip system prevails. An alternative and completely different proposition proposed …
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 …
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 …
Optically Stimulated Luminescence To Date Coastal Dunes And A Possible Tsunami Layer On The Kavak Delta (Saros Gulf, Nw Turkey), Ahmet Evren Ergi̇nal, Nafi̇ye Kiyak Güneç, Hasan Özcan
Optically Stimulated Luminescence To Date Coastal Dunes And A Possible Tsunami Layer On The Kavak Delta (Saros Gulf, Nw Turkey), Ahmet Evren Ergi̇nal, Nafi̇ye Kiyak Güneç, Hasan Özcan
Turkish Journal of Earth Sciences
Optically stimulated luminescence (OSL) dating was used to determine the timing of initial dune formation and reconstruct the evolution of coastal dunes that developed on the Kavak Delta, Saros Gulf, Turkey. Along a 500-m-long representative transect, dune sands were extracted from foredune, semistable (grey) dune, stable (dark) dune and dune-swamp boundary defined by a scarp 50-75 cm high. The data obtained showed that dune drift initiated 670 years ago. A pumice layer 15-20-cm-thick interbedded with marine clay and sand showed an OSL age of 340 years coinciding with underlying dune sand. XRF analysis showed that pumices were of similar composition …
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 …
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 …
First Record Of Crassostrea Cyathula Lamarck 1806 From �The Rupelian-Lower Chattian Of Sarıbuğday-Kovancılar� (Ne Palu) Eastern Taurids, E Turkey, İzzet Hoşgör, Yavuz Okan
First Record Of Crassostrea Cyathula Lamarck 1806 From �The Rupelian-Lower Chattian Of Sarıbuğday-Kovancılar� (Ne Palu) Eastern Taurids, E Turkey, İzzet Hoşgör, Yavuz Okan
Turkish Journal of Earth Sciences
Crassostrea cyathula (Lamarck 1806), a valuable biostratigraphic marker, was found for the first time in eastern Turkey (Eastern Mediterranean), in the Rupelian-Lower Chattian sedimentary sequences of northeastern Palu, Elazığ region, and its palaeoecological characters, palaeobiogeographic and stratigraphic distribution are discussed. These oyster specimens are also the first abundant macrofossils from the Oligocene sediments of the Sarıbuğday-Kovancılar section, which were formerly only recorded by micropalaeontological data.
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 …
Minerals From Macedonia. Xx. Geological Setting, Lithologies, And Identification Of The Minerals From Rzanovo Fe-Ni Deposit, Blazo Boev, Gligor Jovanovski, Petre Makreski
Minerals From Macedonia. Xx. Geological Setting, Lithologies, And Identification Of The Minerals From Rzanovo Fe-Ni Deposit, Blazo Boev, Gligor Jovanovski, Petre Makreski
Turkish Journal of Earth Sciences
The Rzanovo deposit lies within the western ophiolite belt of the Vardar zone. Its main geological units are discussed in terms of their mineralogy, petrology and petrological evolution. Minerals observed include: magnetite, hematite, clinochlore, talc, sepiolite, magnesioriebeckite, lizardite, dolomite, phlogopite, stilpnomelane, quartz, albite, pyrite, maghemite, pyrrhotine, digenite and millerite. Some minerals had non-distinct morphologies and ambiguous characteristics, preventing identification on the basis of physical properties alone. Thus, some of the minerals (magnetite, hematite, talc, dolomite, olivine, calcite, aragonite and brucite) as well as some serpentine minerals (antigorite and chrysotile) were identified by vibrational spectroscopy. Difficulties in identification by IR spectroscopy …