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Articles 1 - 25 of 25
Full-Text Articles in Physical Sciences and Mathematics
Filograna Minor Nov. Sp. (Worm Tube) From The Middle Triassic (Anisian) Reef Boulders Of The Karaburun Peninsula, Western Turkey, Baba Senowbari-Daryan, Michael Link, İsmai̇l Işintek
Filograna Minor Nov. Sp. (Worm Tube) From The Middle Triassic (Anisian) Reef Boulders Of The Karaburun Peninsula, Western Turkey, Baba Senowbari-Daryan, Michael Link, İsmai̇l Işintek
Turkish Journal of Earth Sciences
A colonial serpulid worm tube, Filograna minor nov. sp., from the Anisian reef boulders of the Karaburun Peninsula, Western Turkey is described. The Filograna-bearing boulders occur together with Anisian reef boulders within the Upper Anisian siliciclastic deposits of the Gerence Formation. Filograna minor differs from the Norian species Filograna serialis, described by Senowbari-Daryan and Link from the Taurus Mountains, by the smaller dimensions of the tubes.
Sulfur And Lead Isotope Investigations Of The Carbonate-Hosted Pb-Zn Deposits In The Yahyalı Region, Kayseri, Southern Turkey, Osman Koptagel, Ulvi̇ Ulusoy, Anthony E. Fallick
Sulfur And Lead Isotope Investigations Of The Carbonate-Hosted Pb-Zn Deposits In The Yahyalı Region, Kayseri, Southern Turkey, Osman Koptagel, Ulvi̇ Ulusoy, Anthony E. Fallick
Turkish Journal of Earth Sciences
Carbonate-hosted Pb-Zn deposits are common in the Yahyalı region (Taurus Belt) with galena the most abundant sulfide mineral. The mean d34S values for Göynük, Celaldağı Desandre, Demircilik, Tekke, Havadan and Suçatı deposits were +0.2±0.5, +9.3±0.8, +10.7±1.3, +10.8±1.3, +11.5±2.4, -4.2±0.4%o, respectively. The mean 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb measurements for the studied deposits were 18.968±0.005, 15.741±0.005 and 39.074±0.016 for Göynük, 18.702±0.006, 15.715±0.006 and 38.883±0.021 for Celaldağı Desandre, 18.618±0.020, 15.727±0.008 and 38.852±0.032 for Demircilik, 18.808±0.017, 15.751±0.028 and 38.983±0.166 for Suçatı. The sulfur isotope systematics imply that sulfur originated from a mixture of different sources for the Göynük and Suçatı deposits, but was probably …
Different Modes Of Stress Transfer In A Strike-Slip Fault Zone: An Example From The North Anatolian Fault System In Turkey, Osman Bektaş, Yener Eyüboğlu, Nafi̇z Maden
Different Modes Of Stress Transfer In A Strike-Slip Fault Zone: An Example From The North Anatolian Fault System In Turkey, Osman Bektaş, Yener Eyüboğlu, Nafi̇z Maden
Turkish Journal of Earth Sciences
The dextral North Anatolian Fault System (NAFS) extends for well over 1000 km from the compressive tectonic domain of eastern Anatolia into the broad and diverse tectonic domain of the western Anatolian, Marmara and Aegean regions. These different tectonic regimes are characterized by a narrow deformation zone in the east and a much broader deformation zone with multiple sub-parallel fault zones in the west. The spatial and temporal distribution of large historical and modern earthquakes (Mw>5) shows two distinctive macro-seismic zones in the eastern and western parts of the NAFS. The eastern macro-seismic zone, between the towns of Erzincan …
Stream Sediment Geochemical Exploration For Gold In The Kazdağ Dome In The Biga Peninsula, Western Turkey, Hüseyi̇n Yilmaz
Stream Sediment Geochemical Exploration For Gold In The Kazdağ Dome In The Biga Peninsula, Western Turkey, Hüseyi̇n Yilmaz
Turkish Journal of Earth Sciences
The Tuztaşı Au-Ag mineralized system was discovered within the Kazdağ dome using BLEG (bulk leach extractable gold) and 180-µm stream sediment geochemical data collected across the Biga Peninsula in western Turkey. The deposit is located within the hinge of an antiform consisting mainly of high-grade metamorphic and mélange rocks that include the Altınoluk Pb-Zn-Cu-Ag-Au and Evciler Fe-Au-Cu deposits on the southern and on the northern flanks, respectively; no mineralization has been reported prior to this work which was first carried out in 1996 between Altınoluk and Evciler. The BLEG Ag/Au ratios at Tuztaşı (max 87) and Altınoluk (max 43) are …
Environmental Impact And Drainage Geochemistry In The Vicinity Of The Harput Pb-Zn-Cu Veins, Elazığ, Se Turkey, Leyla Kalender, Cemal Bölücek
Environmental Impact And Drainage Geochemistry In The Vicinity Of The Harput Pb-Zn-Cu Veins, Elazığ, Se Turkey, Leyla Kalender, Cemal Bölücek
Turkish Journal of Earth Sciences
The aim of this study was to examine the environmental impact of major, minor and rare-earth elements (REE) in spring waters and major and minor elements in stream sediments proximal to known vein-type Pb-Zn-Cu ores. Accordingly, a total of 21 water samples were collected from natural springs in the Köprücük, Çolaklı, Kabakçılar and Ekinli areas where ore-bearing rocks are widely exposed. Stream-sediment samples were taken from the Kurt, Kızıldağ and Karacalar and Billurik streams, and a total of 57 samples were sieved to three different size fractions (-80 +140, -140 +200 and -200 mesh) and analyzed by ICP-MS and IE …
Lake Hazar Basin: A Negative Flower Structure On The East Anatolian Fault System (Eafs), Se Turkey, Ercan Aksoy, Murat İnceöz, Ali̇ Koçyi̇ği̇t
Lake Hazar Basin: A Negative Flower Structure On The East Anatolian Fault System (Eafs), Se Turkey, Ercan Aksoy, Murat İnceöz, Ali̇ Koçyi̇ği̇t
Turkish Journal of Earth Sciences
The East Anatolian Fault System (EAFS) is a 30-km-wide, 700-km-long and NE-trending sinistral strike-slip megashear belt between the Anatolian platelet in the northwest and African-Arabian plates in the southeast. It is located between Karlıova County in the NE and Karataş (Adana)-Samandağ (Antakya) in the SW. In the Lake Hazar region, the EAFS consists of five fault zones. These are, from north to south, the Elazığ fault zone, the Uluova fault zone, the Sivrice fault zone, the Adıyaman fault zone and the Lice-Çermik fault zone; in previous studies only the Sivrice fault zone has been reported to be part of the …
Retention And Transport Of Hexavalent Chromium In Calcareous Karst Soils, İrfan Yolcubal, Ni̇hat Hakan Akyol
Retention And Transport Of Hexavalent Chromium In Calcareous Karst Soils, İrfan Yolcubal, Ni̇hat Hakan Akyol
Turkish Journal of Earth Sciences
Hexavalent chromium, which is a highly toxic and soluble form of the element chromium, is a common soil and groundwater contaminant found in many contaminated sites throughout the world and poses a serious risk to human health when released into environment. The objective of this study was to determine transport and retention behaviour of aqueous Cr(VI) species in a highly calcareous and alkaline top soil of a karst system that is vulnerable to contamination. Batch sorption studies and column experiments conducted at both saturated and unsaturated steady-state flow conditions were used to evaluate the sorption/desorption and the transport of Cr(VI) …
Constraints On The Origin Of The Balıkesir Thermal Waters (Turkey) From Stable Isotope (\Delta^{18}O, \Deltad, \Delta^{13}C, \Delta^{34}S) And Major-Trace Element Compositions, Hali̇m Mutlu
Turkish Journal of Earth Sciences
The Balıkesir thermal waters in northwestern Turkey have discharge temperatures in the range of 31.8-98.5 ºC, near neutral pH values of 6.40 to 8.40 and TDS contents between 327 and 2578 mg/l. Samples display variable chemical compositions changing from high-temperature Na_2SO_4-NaHCO_3 waters to warmer CaHCO_3 waters. Trace element concentrations of the waters show significant variation. Comparison between the concentrations of alkaline earth metals in waters and carbonate deposits reveals mobile behavior for Mg and Ba. The ratio of strontium to calcium concentrations in solid and liquid phases was found to be almost the same. Li/Cs and B/Cl ratios of waters …
Origin Of Kaolin Deposits: Evidence From The Hisarcık (Emet-Kütahya) Deposits, Western Turkey, Ali̇ Sayin
Origin Of Kaolin Deposits: Evidence From The Hisarcık (Emet-Kütahya) Deposits, Western Turkey, Ali̇ Sayin
Turkish Journal of Earth Sciences
Kaolin deposits, situated approximately 20 km south of Hisarcık, have been formed by the alteration of dacite and dacitic tuffs related to the Miocene volcanism associated with extensional tectonics. The Hisarcık kaolin deposits occur in the Kızılcukur, Ulaşlar and Kurtdere areas. Kaolinite is the only clay mineral associated with a-quartz, K-feldspar, plagioclase, alunite, natroalunite and hematite in some kaolins, whereas, other kaolinite accompanies smectite, which represents a moderate kaolinization. Low-cristobalite is the dominant silica mineral in these kaolins. In spite of strong kaolinization, the kaolins contain a high amount of finely-disseminated a-quartz in places, resulting in low Al_2O_3 values (13.80 …
Effects Of Compaction Parameters On Heavy Metal Mass Transport In Ankara Clay Liner: Experimental Approach, M. Zeki̇ Çamur, Füsun Canpolat, Hasan Yazicigi̇l
Effects Of Compaction Parameters On Heavy Metal Mass Transport In Ankara Clay Liner: Experimental Approach, M. Zeki̇ Çamur, Füsun Canpolat, Hasan Yazicigi̇l
Turkish Journal of Earth Sciences
Mass transports of Cl, Cd, Cr, Cu, Fe, K, Mn, Ni, Pb and Zn ions through the Ankara clay liner was prepared under two different compaction conditions, and were studied experimentally on the bases of sorption and hydrodynamic dispersion processes. According to geotechnical tests, the Ankara clay material is highly plastic, inorganic clay having a liquid limit of 73, a plastic limit of 29 and a plasticity index of 44. Optimum compaction of the material requires 32% water content and 1.413 g/cm^3 dry density. Two materials, prepared using half of the optimum water content but optimum energy conditions (I) and …
A Mineralogical Note On Boulangerite, Geocronite And Yenerite From Near Işık Dağı (Kızılcahamam-Ankara), Turkey, W. E. Sharp, Mark Wieland, Steven K. Mittwede
A Mineralogical Note On Boulangerite, Geocronite And Yenerite From Near Işık Dağı (Kızılcahamam-Ankara), Turkey, W. E. Sharp, Mark Wieland, Steven K. Mittwede
Turkish Journal of Earth Sciences
Microprobe studies have facilitated recognition of the first documented occurrence of geocronite from Işık Dağı (Ankara, Turkey). While yenerite remains a discredited species along the PbS-Sb2S3 compositional join, our analyses show significant arsenic as did the original analyses for yenerite; thus, this name might be retained for arsenic-bearing varieties of boulangerite.
Stratigraphy And Geochemical Features Of The Early Miocene Bimodal (Ultrapotassic And Calc-Alkaline) Volcanic Activity Within The Ne-Trending Selendi Basin, Western Anatolia, Turkey, Yalçin Ersoy, Cahi̇t Helvaci
Stratigraphy And Geochemical Features Of The Early Miocene Bimodal (Ultrapotassic And Calc-Alkaline) Volcanic Activity Within The Ne-Trending Selendi Basin, Western Anatolia, Turkey, Yalçin Ersoy, Cahi̇t Helvaci
Turkish Journal of Earth Sciences
Western Anatolia has experienced thickening and orogenic collapse subsequent to the Eocene continent-arc collision. The early stage of the post-collisional volcanism in the region was thought to have produced widespread lavas and pyroclastic deposits of calc-alkaline basaltic andesite to rhyolite composition. However, in the Selendi Basin, one of the NE-trending basins in western Anatolia, there are two distinct volcanic unit compositions associated with the Lower Miocene sedimentary rocks: (1) a calc-alkaline, high-potassic felsic unit; and (2) alkaline, ultrapotassic lamproitic units, i.e. both are bimodal in character. The calc-alkaline felsic volcanic rocks (Eğreltidağ volcanic unit) are composed of wide-spread pyroclastic rocks …
Strontium Isotopic And Micropalaeontological Dating Used To Help Redefine The Stratigraphy Of The Neotectonic Hatay Graben, Southern Turkey, Sarah J. Boulton, Alastair H. F. Robertson, Robert M. Ellam, Ümi̇t Şafak, Ulvi̇ Can Ünlügenç
Strontium Isotopic And Micropalaeontological Dating Used To Help Redefine The Stratigraphy Of The Neotectonic Hatay Graben, Southern Turkey, Sarah J. Boulton, Alastair H. F. Robertson, Robert M. Ellam, Ümi̇t Şafak, Ulvi̇ Can Ünlügenç
Turkish Journal of Earth Sciences
In this paper we report for the Hatay Graben, new micropalaeotology, the first strontium dating and new sedimentology. The previous lack of a modern systematic stratigraphy was problematic for the study of the Hatay region. With the new data combined with the existing literature we evaluate and redefine the lithostratigraphy following international standards. The focus of this paper is on the Neogene cover rocks that record the transition from a regional carbonate shelf environment during Palaeocene to Eocene times, through late-stage continental collision, to recent continental rift tectonics that were initiated in the Middle Miocene and continue to operate to …
Nature, Provenance And Relationships Of Early Miocene Palaeovalley Fills, Northern Adana Basin, Turkey: Their Significance For Sediment-Bypassing On A Carbonate Shelf, A. Sami̇ Derman, Kemal Gürbüz
Nature, Provenance And Relationships Of Early Miocene Palaeovalley Fills, Northern Adana Basin, Turkey: Their Significance For Sediment-Bypassing On A Carbonate Shelf, A. Sami̇ Derman, Kemal Gürbüz
Turkish Journal of Earth Sciences
The Gildirli Formation is the oldest Neogene rock unit in the Adana Basin and was formed prior to the regionally extensive Early Miocene marine transgression. These coarse clastic red-beds provide important evidence about the causes and early phases of filling in this large trough, because the Gildirli Formation sediments fill an irregular palaeotopography carved out of Palaeozoic and Mesozoic basement rocks. Detailed study of the Gildirli Formation reveals the existence of at least two alluvial fans supplied from different source areas. A northeastern fan, exposed around Gildirli Village, was fed by streams draining an area of ophiolitic mélange, Mesozoic and …
Pharyngeal Teeth, Lateral Ethmoids, And Jaw Teeth Of Fishes And Additional Fossils From The Late Miocene (Late Khersonian / Early Maeotian) Of Eastern Paratethys (Yalova, Near İstanbul, Turkey), Neri̇man Rühkert Ülkümen, Erdi̇nç Yi̇ği̇tbaş
Pharyngeal Teeth, Lateral Ethmoids, And Jaw Teeth Of Fishes And Additional Fossils From The Late Miocene (Late Khersonian / Early Maeotian) Of Eastern Paratethys (Yalova, Near İstanbul, Turkey), Neri̇man Rühkert Ülkümen, Erdi̇nç Yi̇ği̇tbaş
Turkish Journal of Earth Sciences
A late Khersonian to early Maeotian fossil assemblage from the Upper Miocene to Lower Pliocene Yalakdere Formation near Yalova city (northwestern Anatolia, Turkey) is documented. The following fish taxa, represented by pharyngeal teeth, lateral ethmoids and jaw teeth are described: Cyprinidae with Carassius sp., Tinca sp., Scardinius sp., Leuciscus sp., Barbus sp., Cobitidae with Cobitis sp., Siluridae with Silurus sp., and Esocidae with Esox sp.. Further described vertebrates are reptiles (Trionyx sp.) and small mammals (cf. Eliomys intermedius FRIANT). Additional invertebrate fauna and flora, comprising diverse gastropods, ostracods, charophytes, pollen and limnic green algae, are listed. The fossil assemblage from …
Late Visean–Early Namurian Bivalves From The Zonguldak Coal Basin, Northwestern Turkey, Yavuz Okan, İzzet Hoşgör
Late Visean–Early Namurian Bivalves From The Zonguldak Coal Basin, Northwestern Turkey, Yavuz Okan, İzzet Hoşgör
Turkish Journal of Earth Sciences
Marine bivalves Septimyalina sublamellosa (Etheridge 1878), Septimyalina lamellosa (de Koninck 1842), Septimyalina minor (Brown 1841) and Posidonia becheri Bronn, 1828 are described from the Visean-Namurian transition of Zonguldak coal basin, Northwestern Turkey. Macroinvertebrate fossils are rare in the Lower Carboniferous of the Zonguldak coal basin and only a few shallow marine forms of Myalinidae and Posidoniidae families are present. Their palaeobiogeographic distribution delineates a seaway from Britain to the Black Sea coast during the Carboniferous.
A Condensed Mesozoic Succession North Of İzmir: A Fragment Of The Anatolide-Tauride Platform In The Bornova Flysch Zone, Aral İ. Okay, Demi̇r Altiner
A Condensed Mesozoic Succession North Of İzmir: A Fragment Of The Anatolide-Tauride Platform In The Bornova Flysch Zone, Aral İ. Okay, Demi̇r Altiner
Turkish Journal of Earth Sciences
The Bornova Flysch Zone consists of large blocks of Mesozoic limestone, basalt, serpentinite and radiolarian chert in a highly sheared clastic matrix of latest Cretaceous to Paleocene age. We describe a condensed Mesozoic section from a limestone block near the village of Urbut, 27 km southwest of Bigadiç, north of İzmir. The section, 81 m thick, starts with massive, thickly-bedded Upper Triassic carbonates with megalodonts and foraminifera characteristic of Late Norian-Rhaetian. These are unconformably overlain by condensed, hemipelagic Tithonian-Middle Albian limestones, 19 m thick, with gaps in the succession. The condensed sequence is, in turn, unconformably overlain by red, pink …
Late Ypresian To Middle Lutetian Orthophragminid Record From Central And Northern Turkey: Taxonomy And Remarks On Zonal Scheme, Ercan Özcan, György Less, Botond Kertesz
Late Ypresian To Middle Lutetian Orthophragminid Record From Central And Northern Turkey: Taxonomy And Remarks On Zonal Scheme, Ercan Özcan, György Less, Botond Kertesz
Turkish Journal of Earth Sciences
Orthophragmines are one of the commonest larger foraminifera in the late Paleocene-Eocene shallow-marine deposits of Turkey. Following several common lineages, such as Discocyclina archiaci, Orbitoclypeus schopeni and O. multiplicatus, a major turnover in the orthophragminid composition - both in diversity and abundance - is observed to occur around the early-late Ypresian boundary. This is manifested in the first appearance/dominance of such important lineages like Discocyclina augustae, D. fortisi, Nemkovella strophiolata, Orbitoclypeus douvillei, O. varians, O. furcatus, Asterocyclina stellata and A. alticostata simultaneously with the disappearance of O. multiplicatus and other forms. These and their successors, ranging up at least to …
Petrography, Geochemistry And Origin Of Lower Liassic Dolomites In The Aydıncık Area, Mersin, Southern Turkey, Muhsi̇n Eren, Meryem Yeşi̇lot Kaplan, Selahatti̇n Kadi̇r
Petrography, Geochemistry And Origin Of Lower Liassic Dolomites In The Aydıncık Area, Mersin, Southern Turkey, Muhsi̇n Eren, Meryem Yeşi̇lot Kaplan, Selahatti̇n Kadi̇r
Turkish Journal of Earth Sciences
In the Aydıncık area, the Lower Liassic carbonates consist predominantly of dolomites, including limestone and dolomitic limestone intervals. These carbonates were deposited in peritidal environments, and later underwent early and late stage dolomitization. Petrographically, three dolomite-types are determined: (1) very fine to fine crystalline dolomite (T1) with crystal size of 13-65 µm and a good fabric preservation, (2) coarse crystalline sucrosic dolomite (T2) with size of 65 to 270 µm and fabric destruction, and (3) dolomite cement (T3) that occurs as a clear outer rim to cloudy coarse dolomite crystals (T2) or as a pore-lining and cement-fill of fenestral pores. …
Intracontinental Quaternary Volcanism In The Niksar Pull-Apart Basin, North Anatolian Fault Zone, Turkey, Orhan Tatar, Sema Yurtmen, Haluk Temi̇z, Hali̇l Gürsoy, Fi̇kret Koçbulut, B. Levent Mesci̇, Jean Claude Guezou
Intracontinental Quaternary Volcanism In The Niksar Pull-Apart Basin, North Anatolian Fault Zone, Turkey, Orhan Tatar, Sema Yurtmen, Haluk Temi̇z, Hali̇l Gürsoy, Fi̇kret Koçbulut, B. Levent Mesci̇, Jean Claude Guezou
Turkish Journal of Earth Sciences
The Niksar Basin is sited along the eastern segment of the North Anatolian Fault Zone in Turkey. It is a young sigmoidal pull-apart basin bordered by two non-parallel master faults associated with earthquakes in 1939 and 1942. The fault geometry along the irregular ENE margin of the basin is complex where young Plio-Quaternary volcanic rocks reach the surface along pairs of steep strike-slip faults which cut the basin sediments. The volcanic rocks around the Niksar Basin have been dated by high precision K-Ar dating and the ages range between 542 ± 9 ka and 567 ± 9 ka. The lavas …
Tectonic Evolution Of The Kiraz Basin, Küçük Menderes Graben: Evidence For Compression/Uplift-Related Basin Formation Overprinted By Extensional Tectonics In West Anatolia, Tahi̇r Emre, Hasan Sözbi̇li̇r
Tectonic Evolution Of The Kiraz Basin, Küçük Menderes Graben: Evidence For Compression/Uplift-Related Basin Formation Overprinted By Extensional Tectonics In West Anatolia, Tahi̇r Emre, Hasan Sözbi̇li̇r
Turkish Journal of Earth Sciences
The Kiraz Basin which is located at the eastern end of the Küçük Menderes Graben was previously considered to be an extensional basin. However, the data presented here allow us to infer that the tectonic evolution of the Kiraz Basin could be explained by an alternate model which suggests compression/uplift-related basin formation at the early stage of basin evolution followed, later, by block faulting in an extensional neotectonic regime. The successive compressional and extensional strain is accommodated by a predominantly NE-trending strike-slip fault system. The new model is based on the detailed mapping, field-cross sections and kinematic analyses of the …
Quaternary Activity Of The Cihanbeyli And Yeniceoba Fault Zones: İnönü-Eskişehir Fault System, Central Anatolia, Erman Özsayin, Kadi̇r Di̇ri̇k
Quaternary Activity Of The Cihanbeyli And Yeniceoba Fault Zones: İnönü-Eskişehir Fault System, Central Anatolia, Erman Özsayin, Kadi̇r Di̇ri̇k
Turkish Journal of Earth Sciences
The İnönü-Eskişehir fault system (İEFS) is one of the most important fault systems in Central Anatolia and consists of a series of NW-SE- to WNW-ESE-trending fault zones extending from Uludağ (Bursa) in the northwest to Sultanhanı in the southeast. Between İnönü and Sivrihisar, the Eskişehir fault zone of the İEFS trends WNW, but east of Sivrihisar the İEFS changes its direction to NW-SE and splays out into four fault zones, named the Ilıca, Yeniceoba, Cihanbeyli and Sultanhanı fault zones and extends to south of Tuzgölü in the east. The NW-SE-trending Yeniceoba fault zone (YFZ), exposed between Günyüzü in the west …
The Dikili-Çandarlı Volcanics, Western Turkey: Magmatic Interactions As Recorded By Petrographic And Geochemical Features, Zeki̇ye Karacik, Yücel Yilmaz, Julian A. Pearce
The Dikili-Çandarlı Volcanics, Western Turkey: Magmatic Interactions As Recorded By Petrographic And Geochemical Features, Zeki̇ye Karacik, Yücel Yilmaz, Julian A. Pearce
Turkish Journal of Earth Sciences
Located in the northwestern part of the Aegean region, Dikili-Çandarlı volcanic suite contains products representative for the western Anatolian Miocene volcanism. They can be divided into two main groups: the Dikili and the Çandarlı groups. The Dikili group is Early-Middle Miocene in age and consists mainly of pyroclastic rocks, andesitic-dacitic lavas, lava breccia, lahar flows and associated sedimentary rocks. The lavas contain disequilibrium phenocrysts assemblages. The Çandarlı group consists of Upper Miocene-Pliocene lava and sediment associations. The volcanic rocks consist mainly of rhyolitic domes and basaltic trachyandesite-basaltic andesite lavas erupted along the NW-SE- and NE-SW-trending fault systems; the faults controlled …
Jurassic Volcanism In The Eastern Pontides: Is It Rift Related Or Subduction Related?, Cüneyt Şen
Jurassic Volcanism In The Eastern Pontides: Is It Rift Related Or Subduction Related?, Cüneyt Şen
Turkish Journal of Earth Sciences
The Jurassic volcanic rocks in the centre of the northern zone (south of Trabzon City) provide important constraints on the evolution of Pontides. The investigated volcanic rocks form a transitional series between tholeiitic and calc-alkaline, and is dominated by basalt, basaltic andesite and andesite. Geochemically, they are enriched in LILE and LREE contents and depleted in HFSE [(La/Yb)_N= 2.2 - 8.5; (Nb/La)_N= 0.1 - 0.77)] compared to mid-ocean ridge basalts and have radiogenic Nd isotope ratios of \epsilonNd(210 Ma)= -0.72 to 3.24. These trace element and isotope data suggest that these rocks were derived from low degrees of partial melting …
A N-S-Trending Active Extensional Structure, The Şuhut (Afyon) Graben: Commencement Age Of The Extensional Neotectonic Period In The Isparta Angle, Sw Turkey, Ali̇ Koçyi̇ği̇t, Şule Deveci̇
A N-S-Trending Active Extensional Structure, The Şuhut (Afyon) Graben: Commencement Age Of The Extensional Neotectonic Period In The Isparta Angle, Sw Turkey, Ali̇ Koçyi̇ği̇t, Şule Deveci̇
Turkish Journal of Earth Sciences
The Şuhut graben is an 8-11-km-wide, 24-km-long, N-S-trending, active extensional structure located on the southern shoulder of the Akşehir-Afyon graben, near the apex of the outer Isparta Angle. The Şuhut graben developed on a pre-Upper Pliocene rock assemblage comprising pre-Jurassic metamorphic rocks, Jurassic-Lower Cretaceous platform carbonates, the Lower Miocene-Middle Pliocene Afyon stratovolcanic complex and a fluvio-lacustrine volcano-sedimentary sequence. The eastern margin of the Şuhut graben is dominated by the Afyon volcanics and their well-bedded fluvio-lacustrine sedimentary cover, which is folded into a series of NNE-trending anticlines and synclines. This volcano-sedimentary sequence was deformed during a phase of WNW-ESE contraction, and …