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- Provenance (3)
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Articles 1 - 23 of 23
Full-Text Articles in Physical Sciences and Mathematics
Early Pliocene Molluscs From The Easternmost Mediterranean Region (Se Turkey): Biostratigraphic, Ecostratigraphic, And Palaeobiogeographic Implications, Yeşi̇m Büyükmeri̇ç, Erdoğan Teki̇n, Erdal İbrahi̇m Herece, Koray Sözeri̇, Ni̇hal Akca, Baki̇ Erdoğan Varol
Early Pliocene Molluscs From The Easternmost Mediterranean Region (Se Turkey): Biostratigraphic, Ecostratigraphic, And Palaeobiogeographic Implications, Yeşi̇m Büyükmeri̇ç, Erdoğan Teki̇n, Erdal İbrahi̇m Herece, Koray Sözeri̇, Ni̇hal Akca, Baki̇ Erdoğan Varol
Turkish Journal of Earth Sciences
The mollusc faunas from Pliocene deposits of the Hatay-İskenderun region were investigated at nine localities and complemented with three localities from earlier studies. The Pliocene units were deposited in three adjacent subbasins, Hatay-Samandağ (HS), Altınözü-Babatorun (AB), and İskenderun-Arsuz (İA); the first two are also known as the Hatay Graben. Basin configurations and shape, environmental evolution, and faunal compositions were affected by differential tectonic histories since the Late Miocene. In total 162 species (94 gastropod, 61 bivalve, and 7 scaphopod) are recorded, 80 of which are recorded for the first time from the region. The occurrence of tropical stenohaline benthic taxa …
40ar-39ar Geochronology And Petrogenesis Of Postcollisional Trachytic Volcanism Along The İzmir-Ankara-Erzincan Suture Zone (Ne, Turkey), Gönenç Göçmengi̇l, Zeki̇ye Karacik, Şengül Can Genç, Mehmet Zeki̇ Bi̇llor
40ar-39ar Geochronology And Petrogenesis Of Postcollisional Trachytic Volcanism Along The İzmir-Ankara-Erzincan Suture Zone (Ne, Turkey), Gönenç Göçmengi̇l, Zeki̇ye Karacik, Şengül Can Genç, Mehmet Zeki̇ Bi̇llor
Turkish Journal of Earth Sciences
The obliteration of the Neo-Tethyan Ocean and collision of the microplates along the northern part of Turkey led to the development of the İzmir-Ankara-Erzincan suture zone (IAESZ). After the collision of Pontides with the Central-Anatolian Crystalline Complex (CACC) in the Paleocene, a new phase of extension and volcanism concomitantly developed along the northern (Almus; Pontides) and southern (Yıldızeli; CACC) sides and along the IAESZ during the Middle Eocene time interval. The first products of the Middle Eocene volcanism in these areas are represented by calc-alkaline to alkaline (basic-intermediate) volcanic and volcanoclastic units together with late-stage trachytic dikes, plugs, and stocks. …
Biostratigraphic Analysis Across The Eocene-Oligocene Boundary In The Southern Hellenic Thrace Basin (Lemnos Island, North Aegean Sea), Sofia Kostopoulou, Angelos Maravelis, Avraam Zelilidis
Biostratigraphic Analysis Across The Eocene-Oligocene Boundary In The Southern Hellenic Thrace Basin (Lemnos Island, North Aegean Sea), Sofia Kostopoulou, Angelos Maravelis, Avraam Zelilidis
Turkish Journal of Earth Sciences
The time interval of the sedimentation in the southern Hellenic Thrace Basin (Lemnos Island, northeast Aegean Sea) was studied, based on the qualitative analysis of calcareous nannoplankton and quantitative analysis of planktonic foraminifera. The samples were collected from 4 different stratigraphic sections (Ifestia, Panagia, Kaspaka, and Kaminia). The biostratigraphic analyses on both calcareous nannoplankton and planktonic foraminifera reveal an age of Late Eocene-Early Oligocene (Priabonian-Rupelian). In particular, the Eocene-Oligocene boundary is recorded at the lower part of the turbiditic system, in the Ifestia section. The present study offers the first taxonomic analysis of planktonic foraminifera of this age in the …
Mineral Records Of The Pyroxenites Formed Within Harzburgites (Ulaş, Sivas, Turkey): Implications On Petrogenesis And Tectonic Setting, Özgür Bi̇li̇ci̇, Hasan Kolayli
Mineral Records Of The Pyroxenites Formed Within Harzburgites (Ulaş, Sivas, Turkey): Implications On Petrogenesis And Tectonic Setting, Özgür Bi̇li̇ci̇, Hasan Kolayli
Turkish Journal of Earth Sciences
In this article, the petrological processes of the clinopyroxenite dykes and host peridotites occurring in Ulaş District (Sivas, mid-Anatolia, Turkey) are discussed. The new geochemical data from major minerals in the clinopyroxenite dykes and host harzburgites revealed differences to the supra-subduction zone (SSZ)-type pyroxenites and peridotites. In particular, the NiO content of olivines in the host harzburgites showed the signature of the mantle, whereas rare olivines of the clinopyroxenites had a NiO content and Fo number that were inferior to those of mantle peridotites. The high Mg-number of clinopyroxenes in the clinopyroxenites was likely associated with the partial remelting of …
Shallow Crust Structure Of The Büyük Menderes Graben Through An Analysis Of Gravity Data, Fatma Fi̇gen Altinoğlu, Murat Sari, Ali̇ Aydin
Shallow Crust Structure Of The Büyük Menderes Graben Through An Analysis Of Gravity Data, Fatma Fi̇gen Altinoğlu, Murat Sari, Ali̇ Aydin
Turkish Journal of Earth Sciences
The Büyük Menderes is one of the most important geostructural features of highly seismically active western Anatolia, Turkey. This article aims to analyze the geological features and the shallow crust structure of the Büyük Menderes graben. To achieve this, six different edge detection filters and a 3D inversion method were applied to the Bouguer gravity data to detect new lineaments and shallow crust topographies. A renewed fault map of the Büyük Menderes graben is the significant contribution of the present study. New lineaments were detected in the western, southeastern, and northern parts of the region, where intense seismicity was observed. …
Cathodoluminescence, Fluid Inclusions, And Trace Element Data For The Syntaxial Quartz Cementation In The Sandstones Of The Ora Formation, Northern Iraq, Muhamed F. Omer, Henrik Friis
Cathodoluminescence, Fluid Inclusions, And Trace Element Data For The Syntaxial Quartz Cementation In The Sandstones Of The Ora Formation, Northern Iraq, Muhamed F. Omer, Henrik Friis
Turkish Journal of Earth Sciences
Quartz cements of the quartz arenitic sandstones from the Chalky Nasara and Ora sections of the (Devonian-Carboniferous) Ora Formation in northern Iraq have been studied. A combination of hot cathodoluminescence, LA-ICP-MS, and fluid inclusion microthermometry revealed three syntaxial quartz cement generations (Q1, Q2, and Q3). The early Q1 cementation has gray to slightly brown luminescences, postdated compaction, and reduced intergranular porosity associated with illite formed during eogenesis. Q2 is characterized by dark brown luminescence overgrowths and is more voluminous in the thinly bedded sandstones than in the thickly bedded sandstones filling most of the remaining pore space during mesogenesis. Q3 …
Palaeontological Evidence And Sedimentary Facies In A Lower Miocene (Aquitanian) Succession From The Bingöl Minibasin (Sivas Basin), Central Anatolia, Mehmet Serkan Akki̇raz, Özgen Kangal, Nazi̇re Özgen Erdem, Yeşi̇m Büyükmeri̇ç, Ci̇han Doğruöz
Palaeontological Evidence And Sedimentary Facies In A Lower Miocene (Aquitanian) Succession From The Bingöl Minibasin (Sivas Basin), Central Anatolia, Mehmet Serkan Akki̇raz, Özgen Kangal, Nazi̇re Özgen Erdem, Yeşi̇m Büyükmeri̇ç, Ci̇han Doğruöz
Turkish Journal of Earth Sciences
The results of palaeontological (palynological and mollusc) and sedimentological analyses of the lower Miocene deposits from the Bingöl minibasin, a part of the Sivas Basin, are exhibited to define the vertical shifts in sedimentation environments and plant covers, linking to eustasy. The presence of index species Corbulomya (Lentidium) aquitanica suggests an Aquitanian age for the studied succession, which can be divided into three informal units: a lower unit, a middle unit, and an upper unit. Fine-grained sediments of the lower unit were deposited in a low sea-level setting due to high quantities of terrestrial palynomorphs. This unit is overlain by …
Influence Of Leachate On The Oligocene-Miocene Clays Of The İstanbul Area, Turkey, Sadik Öztoprak, Davut Laçi̇n
Influence Of Leachate On The Oligocene-Miocene Clays Of The İstanbul Area, Turkey, Sadik Öztoprak, Davut Laçi̇n
Turkish Journal of Earth Sciences
Oligo-Miocene clay outcrops on the European side (west and northwest part) of İstanbul were analysed. Formerly, a landfill and sanitary landfill were built on the clay. Mineral liners of the current and extending parts of the İstanbul landfill consist of these clays, since they include a considerable amount of smectite, illite, and kaolinite. With this feature, these clays are also an important candidate for the buffer material of repositories for nuclear wastes of newly planned nuclear power plants. In this context, one Miocene and two Oligocene clay samples were subjected to leachate under low stress using an odometer device during …
Reconstructing The Sedimentary Evolution Of The Miocene Aksu Basin Based On Fan Delta Development (Eastern Mediterranean-Turkey), Serkan Üner, Erman Özsayin, Ramazan Kadi̇r Di̇ri̇k, Tahsi̇n Atti̇la Çi̇ner, Mustafa Karabiyikoğlu
Reconstructing The Sedimentary Evolution Of The Miocene Aksu Basin Based On Fan Delta Development (Eastern Mediterranean-Turkey), Serkan Üner, Erman Özsayin, Ramazan Kadi̇r Di̇ri̇k, Tahsi̇n Atti̇la Çi̇ner, Mustafa Karabiyikoğlu
Turkish Journal of Earth Sciences
The Aksu Basin in southern Turkey is dominantly represented by an alluvial fan and five fan deltas (FDs) developed along the tectonically controlled margins of the basin during the Miocene. Four alternating compressional and tensional tectonic phases have influenced the basin since its formation. Strong tectonic movements caused high sedimentation rates and progradation of large debris-flow and mass-flow dominated FDs. Here we describe two FDs (the Karadağ and Kargı FDs) in detail. The Karadağ FD began to develop under the control of a compressional regime and continued the evolution under a tensional regime. The same tensional regime caused the separation …
Heavy Minerals And Exotic Pebbles From The Eocene Flysch Deposits Of The Magura Nappe (Outer Western Carpathians, Eastern Slovakia): Their Composition And Implications On The Provenance, Katarína Bónová, Ján Bóna, Martin Kovácik, Tomás Mikus
Heavy Minerals And Exotic Pebbles From The Eocene Flysch Deposits Of The Magura Nappe (Outer Western Carpathians, Eastern Slovakia): Their Composition And Implications On The Provenance, Katarína Bónová, Ján Bóna, Martin Kovácik, Tomás Mikus
Turkish Journal of Earth Sciences
The study aims to reconstruct the crystalline parent rock assemblages of the Eocene Strihovce Formation (Krynica Unit) and Mrazovce Member (Raca Unit) deposits, based on the heavy mineral suites, their corrosive features, geochemistry of garnet and tourmaline, zircon cathodoluminescence (CL) images, and exotic pebble composition. Both units are an integral part of the Magura Nappe belonging to the Flysch Belt (Outer Western Carpathians). Corrosion signs observable on heavy minerals point to different burial conditions and/or diverse sources. The compositions of the detrital garnets and tourmalines as well as the CL study of zircons indicate their origin in gneisses, mica schists, …
Morphotectonic Analysis Of The East Anatolian Fault, Turkey, Abdelrahman Khalifa, Zi̇yadi̇n Çakir, Lewis Owen, Şi̇nasi̇ Kaya
Morphotectonic Analysis Of The East Anatolian Fault, Turkey, Abdelrahman Khalifa, Zi̇yadi̇n Çakir, Lewis Owen, Şi̇nasi̇ Kaya
Turkish Journal of Earth Sciences
The East Anatolian Fault (EAF) is a morphologically distinct and seismically active left-lateral strike-slip fault that extends for ~400 km and forms the Arabian/Anatolian plate boundary in southeastern Turkey. The EAF together with its conjugate fault, the North Anatolian Fault, help accommodate the westward escape of the Anatolian plate from the Arabian/Eurasian collision zone. Morphotectonic features along the EAF provide insights into the nature of landscape development and aid in understanding variations in tectonic activity and fault evolution. Several geomorphic indices, namely stream length-gradient index, mountain-front sinuosity, valley width to valley height ratio, basin asymmetry factor, and drainage density, and …
Triassic-Jurassic Arc Magmatism In The Pontides As Revealed By The U-Pb Detrital Zircon Ages In The Jurassic Sandstones Of Northeastern Turkey, Remzi̇ye Akdoğan, Aral I. Okay, István Dunkl
Triassic-Jurassic Arc Magmatism In The Pontides As Revealed By The U-Pb Detrital Zircon Ages In The Jurassic Sandstones Of Northeastern Turkey, Remzi̇ye Akdoğan, Aral I. Okay, István Dunkl
Turkish Journal of Earth Sciences
The Eastern Pontides were located at the southern active margin of Laurasia during Mesozoic time. Jurassic volcaniclastic sediments and volcanic rocks of the Pontides represent products of the arc magmatism above a north-dipping subduction zone. Despite the wide distribution of the Jurassic volcaniclastic/volcanic succession, the precise age of the Jurassic volcaniclastic sequence and that of the synsedimentary magmatism are poorly constrained. Here we present U-Pb detrital zircon ages from two Jurassic sandstones belonging to the Şenköy Formation of the Eastern Pontides. One sample is taken from the base of the Şenköy Formation unconformably overlying the late Carboniferous Gümüşhane granite. The …
Resistivity Inversion Of Transversely Isotropic Media, Ertan Pekşen, Türker Yas
Resistivity Inversion Of Transversely Isotropic Media, Ertan Pekşen, Türker Yas
Turkish Journal of Earth Sciences
In this paper, we have suggested a finite difference algorithm for resistivity forward and inverse modeling with electrically anisotropic media in applied geophysics. Electrical anisotropy affects the surface measurement in a fashion that may make interpretation erroneous. This means that the resistivity section obtained by an inversion method that does not incorporate electrical anisotropy gives the wrong subsurface structure. We used a classical multielectrode dataset of a profile for estimating not only horizontal but vertical resistivity as well. Thus, the electrical anisotropy can be calculated. Finally, the finite difference mesh can be corrected by using the estimated anisotropic coefficient. The …
Chemical Composition And Suitability Of Some Turkish Thermal Muds As Peloids, Muazzez Çeli̇k Karakaya, Necati̇ Karakaya
Chemical Composition And Suitability Of Some Turkish Thermal Muds As Peloids, Muazzez Çeli̇k Karakaya, Necati̇ Karakaya
Turkish Journal of Earth Sciences
Thermal muds have been used in many spas for the treatment of different diseases as well as to clean and beautify the skin and in different forms such as mud baths, masks, and cataplasms. Mineralogical and chemical compositions and the possible toxicity of the peloids were investigated and compared with some limits to determine whether they have any health benefits and potential applications for pelotherapeutic treatments. The studied peloid samples were collected from 19 spas in different parts of Turkey and they were classified as neutral to slightly alkaline, with a high electrical conductivity value that had a high chlorine …
Geochemistry And Source Characteristics Of Dehsard Mafic Volcanic Rocks In The Southeast Of The Sanandaj-Sirjan Zone, Iran: Implications For The Evolution Of The Neo-Tethys Ocean, Mohammadali Nazemei, Mohsen Arvin, Sara Dargahi
Geochemistry And Source Characteristics Of Dehsard Mafic Volcanic Rocks In The Southeast Of The Sanandaj-Sirjan Zone, Iran: Implications For The Evolution Of The Neo-Tethys Ocean, Mohammadali Nazemei, Mohsen Arvin, Sara Dargahi
Turkish Journal of Earth Sciences
The Late Jurassic-Early Cretaceous Dehsard mafic volcanic rocks crop out in the southeastern Sanandaj-Sirjan Zone (SSZ), composed primarily of basalts and basaltic andesite with subordinate dolerite. They are influenced to some degree by hydrothermal alteration under zeolite-greenschist facies. Using fairly immobile trace elements, the mafic volcanic rocks show subalkaline (tholeiitic) affinities. They commonly have similar designs with somewhat strong enrichment in light rare earth elements (LREEs) and large ion lithophile elements (LILEs) and depletion in high field strength elements (HFSEs; e.g., Nb, Ta, Ti) and nearly flat heavy rare earth element (HREE) patterns. The negligible or absence of negative Eu …
Metamorphism, Magmatism, And Exhumation History Of The Tavşanlı Zone, Nw Turkey: New Petrological Constraints, Şenel Özdamar, Gürsel Sunal, Muhterem Demi̇roğlu, Cenk Yaltirak, Mehmet Zeki̇ Bi̇llor, Stoyan Georgiev, Willis Hames, Istvan Dunkl, Hali̇l Can Aydin
Metamorphism, Magmatism, And Exhumation History Of The Tavşanlı Zone, Nw Turkey: New Petrological Constraints, Şenel Özdamar, Gürsel Sunal, Muhterem Demi̇roğlu, Cenk Yaltirak, Mehmet Zeki̇ Bi̇llor, Stoyan Georgiev, Willis Hames, Istvan Dunkl, Hali̇l Can Aydin
Turkish Journal of Earth Sciences
The Tavşanlı Zone (TZ) is a high-pressure/low-temperature metamorphic belt representing subduction and exhumation between the Sakarya Zone and the Afyon-Bolkardağ Zone in western Anatolia. This paper provides new and precise geological data including whole-rock and mineral chemistry, phengite 40Ar/39Ar ages, zircon laser ablation ICP-MS U-Pb, and apatite (U-Th)/He thermochronological information for a region of the Sivrihisar metamorphic complex that has been less studied than other regions of the TZ. This region comprises Permo-Carboniferous metamorphic units, Eocene granodiorite and microgranodiorite, terrestrial clastics, and Holocene alluvium. The mineral assemblage of the granite-gneiss contains quartz, plagioclase, K-feldspar, microcline, muscovite, and rare biotite and …
What Is The Reason For The High Bouguer Gravity Anomaly At Çumra, Konya(Central Anatolia)?, Nedi̇m Gökhan Aydin, Turgay İşseven
What Is The Reason For The High Bouguer Gravity Anomaly At Çumra, Konya(Central Anatolia)?, Nedi̇m Gökhan Aydin, Turgay İşseven
Turkish Journal of Earth Sciences
The Bouguer gravity anomaly map of Turkey shows relatively high values around the Çumra region, Konya. This area has a flat topography and a thick cover of sediments despite being seated on a suture zone formed between Anatolide and Tauride Platforms after the Neo-Tethys Ocean closed. High Bouguer gravity anomalies indicate an anomalous mass excess buried under the flat topography. In the present study, the gravity anomaly is studied using several analysis and processing methods in order to understand and infer its possible sources. Spectral analysis of the anomaly showed that the mass should be buried at a depth of …
Calc-Alkaline Magmatism Associated With Salt Diapirs In The Shurab And Garmsarback-Arc Areas (Central Basin, Iran): Magma Genesis And Tectonic Implications, Somayeh Falahaty, Mortaza Sharifi, Moussa Noghreyan, Homayon Safaei, Mohammad Ali Makizadeh
Calc-Alkaline Magmatism Associated With Salt Diapirs In The Shurab And Garmsarback-Arc Areas (Central Basin, Iran): Magma Genesis And Tectonic Implications, Somayeh Falahaty, Mortaza Sharifi, Moussa Noghreyan, Homayon Safaei, Mohammad Ali Makizadeh
Turkish Journal of Earth Sciences
Medium- and high-K calc-alkaline magmatism of the Shurab (southeast Qom city) and Garmsar (northwest Garmsar city) areas occurred within the Lower Red Formation in the Central Basin behind the Urumieh-Dokthar Magmatic Arc. In terms of whole-rock geochemical analyses and in agreement with the petrographic features, all representative samples of the Shurab area are classified into three groups: group 1 with mainly intergranular texture comprises basalt/trachybasalt, while groups 2 and 3 with trachytic and porphyritic textures, respectively, have basaltic trachyandesite composition. The overall major constituents are plagioclase with composition in the range from An49Ab23 to An75Ab47, clinopyroxene with composition in the …
Palynological And Petroleum Geochemical Assessment Of The Lower Oligocene Mezardere Formation, Thrace Basin, Nw Turkey, Kadi̇r Gürgey, Zühtü Bati
Palynological And Petroleum Geochemical Assessment Of The Lower Oligocene Mezardere Formation, Thrace Basin, Nw Turkey, Kadi̇r Gürgey, Zühtü Bati
Turkish Journal of Earth Sciences
The Oligocene clastic sequence of the Mezardere Formation (MF) with laterally variable organic richness has long been known as a proven source of gas with minor oil accumulations across the Thrace Basin of northwest Turkey. However, based on well data for the thick MF, neither detailed work in relation to age dating and stratigraphy nor a close linkage between the depositional facies/ environments, organic richness/organic proxies, and cyclicity has been established yet. In the present study, the MF was informally subdivided into Lower MF (LMF) and Upper MF (UMF) based on the distinct differences in palynological and geochemical data. Based …
Petrogenesis, Geochemistry, And Tectonic Setting Of A Basaltic Body Within Thegercus Formation Of Northern Iraq: First Record For Eocene Anorogenic Volcanicactivity In The Region, Yawooz A. Kettanah, Adnan H. Bamarni
Petrogenesis, Geochemistry, And Tectonic Setting Of A Basaltic Body Within Thegercus Formation Of Northern Iraq: First Record For Eocene Anorogenic Volcanicactivity In The Region, Yawooz A. Kettanah, Adnan H. Bamarni
Turkish Journal of Earth Sciences
An abnormally odd and rare occurrence of a basaltic body has been discovered in the middle of the Gercus Formation within the large, double-plunging NW-SE trending Bekhair Anticline to the north of Duhok city, northern Iraq. This is the first discovery of such a volcanic body within the widely exposed Gercus Formation in northern Iraq, southeastern Turkey, and western Iran. This volcanic body, named by the authors the Gercus Basalt, has a long tabular/lenticular shape with a total length of ~4.5 km and a thickness ranging between 1 to 16 m. It is exposed on both limbs of the anticline …
Provenance Investigation From Sedimentary Petrography Of The Upper Cretaceous Deepmarine Low Density Turbidites Of The Tanjero Formationaround Arbat, Northeastern Iraq, Hasan Çeli̇k, Tavan Muhammad Hama Sali̇h
Provenance Investigation From Sedimentary Petrography Of The Upper Cretaceous Deepmarine Low Density Turbidites Of The Tanjero Formationaround Arbat, Northeastern Iraq, Hasan Çeli̇k, Tavan Muhammad Hama Sali̇h
Turkish Journal of Earth Sciences
Deep marine low density turbidites of the Upper Cretaceous Tanjero Formation were studied in terms of their petrographic composition to deduce the provenance of the unit around Arbat, northeastern Iraq. Petrographic works based on modal analysis of the clastic rock fragments and released single minerals in silt, fine to coarse grained sandstone, and, in very small quantities, pebbly sandstone show that these turbidites are mainly composed of sedimentary rock fragments such as carbonate, microcrystalline and cryptocrystalline quartz bearing siliceous sedimentary cherts, Radiolaria bearing cherts, and released Radiolaria fossils from the cherts during a short distance transportation. Quartz and feldspar ratios …
A New Chronostratigraphy ( 40ar- -39ar And U-Pb Dating) For The Middle Section Of The Burdur-Fethiye Shear Zone, Sw Turkey (Eastern Mediterranean), İrem Eli̇tez, Cenk Yaltirak, Gürsel Sunal
A New Chronostratigraphy ( 40ar- -39ar And U-Pb Dating) For The Middle Section Of The Burdur-Fethiye Shear Zone, Sw Turkey (Eastern Mediterranean), İrem Eli̇tez, Cenk Yaltirak, Gürsel Sunal
Turkish Journal of Earth Sciences
Southwestern Turkey is a tectonically active region where extensional, strike-slip, and compressional tectonics cooccur. The Burdur-Fethiye Shear Zone is located in the middle of this complex area. Understanding the tectonic evolution of this region is crucial, but the controversial Neogene chronostratigraphy does not allow robust synthesis because of poor age control. The middle section of the Burdur-Fethiye Shear Zone includes three basins: the Acıpayam, Çameli, and Gölhisar basins. All these basins represent restricted portions of ancient larger carbonate lakes. The lacustrine sediments are locally covered or cut by lamproites with sparse intercalations of tuff levels. New 40Ar- 39Ar biotite and …
Origin Of The Pleonaste-Bearing Mafic-Ultramafic Rocks From The Armutlu Peninsula, Nw Turkey, Mutlu Özkan, Ömer Faruk Çeli̇k
Origin Of The Pleonaste-Bearing Mafic-Ultramafic Rocks From The Armutlu Peninsula, Nw Turkey, Mutlu Özkan, Ömer Faruk Çeli̇k
Turkish Journal of Earth Sciences
Al-rich spinels were rarely reported compared to Cr-spinels, which were mostly observed in ophiolitic rocks. Pleonaste [(Mg, Fe2+)Al2O4], which is an Al-rich spinel, was observed in the ophiolitic mafic-ultramafic rocks tectonically located in the Early Cretaceous accretionary complex, at the eastern part of the Armutlu peninsula, NW Turkey. The ophiolitic mafic-ultramafic rocks have cumulate character, and most of them are represented by peridotite and pyroxenite. Pleonaste was observed in pyroxenites and gabbros of the ophiolitic rocks. Pyroxenites consist mainly of clinopyroxene + orthopyroxene + amphibole ± olivine + spinel. Gabbros are composed of clinopyroxene + orthopyroxene + amphibole + plagioclase …