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Articles 301 - 330 of 917
Full-Text Articles in Earth Sciences
Mineralogical, Petrographic, And Geochemical Characterization Of Colored İscehisarmarbles (Afyonkarahisar, W-Turkey), Meti̇n Bağci
Mineralogical, Petrographic, And Geochemical Characterization Of Colored İscehisarmarbles (Afyonkarahisar, W-Turkey), Meti̇n Bağci
Turkish Journal of Earth Sciences
The İscehisar marbles are located 25 km northeast of Afyonkarahisar on the Ankara highway in the vicinity of the town of İscehisar. These marbles have economic importance in the Afyon region. The purpose of this study was to reveal the mineralogical, petrographic, and geochemical characteristics of the İscehisar marbles, displaying different colors, structures, textures, and other different features. Based on polarized light microscopy investigations, the İscehisar marbles can be classified into 3 subgroups: from bottom to top 1) calcitic marbles composed of calcite minerals, 2) transition/interlayer marbles, and 3) dolomitic marbles. According to the field descriptions, each subgroup has various …
Integrated Biostratigraphy And Benthic Foraminifera Of The Middle-Upper Eocenedeposits Of Urtsadzor Section (Southern Armenia), Elena Zakrevskaya, György Less, Eleonora Bugrova, Ekaterina Shcherbinina, Taron Grigoryan, Lilit Sahakyan
Integrated Biostratigraphy And Benthic Foraminifera Of The Middle-Upper Eocenedeposits Of Urtsadzor Section (Southern Armenia), Elena Zakrevskaya, György Less, Eleonora Bugrova, Ekaterina Shcherbinina, Taron Grigoryan, Lilit Sahakyan
Turkish Journal of Earth Sciences
The Urtsadzor section, typical for the Paleocene-Eocene of Southern Armenia, is composed of hemipelagic to shelf succession. Planktonic foraminifera (PF), larger benthic foraminifera (LBF), and nannofossils were studied from Priabonian sediments of Urtsadzor section that enabled direct correlation of the biohorizons of these three groups. We present here the results of the microfossil study from the Bartonian and Priabonian parts of the section, with a special focus on larger and smaller benthic foraminifera (SBF). The 350 m thick studied interval corresponds to the planktonic foraminiferal zones P12/E10-11 to P15/E15, the nannofossil zones NP16 to NP19, the LBF zones SBZ17 to …
Stable Carbon And Oxygen Isotopes As Environmental Indicators Of The Late Pleistocene Inel Arenoso, Sonora, Northwest Mexico, Victor Adrian Perez Crespo, Tamara Cruz Y Cruz, Alejandro Terrazas Mata, Pedro Morales Puente, Martha Benavente, Edith Cienfuegos-Alvrado, Francisco J. Otero
Stable Carbon And Oxygen Isotopes As Environmental Indicators Of The Late Pleistocene Inel Arenoso, Sonora, Northwest Mexico, Victor Adrian Perez Crespo, Tamara Cruz Y Cruz, Alejandro Terrazas Mata, Pedro Morales Puente, Martha Benavente, Edith Cienfuegos-Alvrado, Francisco J. Otero
Turkish Journal of Earth Sciences
The paleoenvironment conditions that existed in the Late Pleistocene at the archaeological-paleontological site of El Arenoso, Sonora, NW Mexico, were inferred using the carbon and oxygen stable isotopes from one bison, one mammoth, and thirteen horses as well as the pedological characteristics and the carbon isotopes of calcium carbonates from paleosoil. The values δ13C of the bison (-1.4‰), the horses (-2.8‰), and the mammoth (-4.3‰) show that these animals fed mainly on C4 plants and carbon isotopic values from profile horizons of locality 4Bgk (-3.4‰), 3Ck (-3.4‰), and 2Bgk2 (-5.7‰) indicated the presence of C3/C4 vegetation mixed in El Arenoso. …
Rheological Behaviour In Continental And Oceanic Subduction:Inferences For The Seismotectonics Of The Aegean Region, Massimiliano Maggini, Riccardo Caputo
Rheological Behaviour In Continental And Oceanic Subduction:Inferences For The Seismotectonics Of The Aegean Region, Massimiliano Maggini, Riccardo Caputo
Turkish Journal of Earth Sciences
We reconstructed several rheological transects across the Aegean Region, comparing the behaviour in collisional versus subducting settings. We interpolated closely spaced 1D strength envelopes, realized through a dedicated MATLAB script, for determining the shallow lithospheric distribution of brittle and ductile layers. We mainly used literature data and geodynamic considerations to fix the parameters for the rheological modelling and took particular care in reproducing reliable thermal models. The results of the mechanical-rheological model highlighted the following features and differences between the northern continental collision and the southern oceanic subduction settings: i) a slightly shallower brittle-ductile transition (BDT) in the western sectors …
Paleoecological Insights On Latest Oligocene-Early Miocene Planktonic Foraminifera From The J-Anomaly Ridge (Iodp Hole U1406a), Alessio Fabbrini, Luca Maria Foresi
Paleoecological Insights On Latest Oligocene-Early Miocene Planktonic Foraminifera From The J-Anomaly Ridge (Iodp Hole U1406a), Alessio Fabbrini, Luca Maria Foresi
Turkish Journal of Earth Sciences
This paper focuses on a paleoecological study conducted on planktonic foraminifera from upper Oligocene-lower Miocene deposits of the J-Anomaly Ridge (North Atlantic Ocean). Paleoclimatic studies are crucial to better comprehend how climatic changes occurred in the past and how they might influence global climate in the next few decades. Oceanic currents are the predominant vehicle for heat transport across the globe and therefore organisms living within the water mass can supply much information on paleoceanographic settings. In total, 53 samples from IODP Hole U1406A were selected in the core interval 96-24 CCSF-M to perform statistical analyses (R-mode cluster analysis, principal …
Determining The Lake Protected Zones Using Gis-Based Drastic Model To Groundwatervulnerability In Salda Lake Basin (Burdur/Turkey), Si̇mge Varol, Ayşen Davraz, Erhan Şener, Şehnaz Şener, Fatma Aksever, Bülent Kirkan, Ahmet Tokgözlü
Determining The Lake Protected Zones Using Gis-Based Drastic Model To Groundwatervulnerability In Salda Lake Basin (Burdur/Turkey), Si̇mge Varol, Ayşen Davraz, Erhan Şener, Şehnaz Şener, Fatma Aksever, Bülent Kirkan, Ahmet Tokgözlü
Turkish Journal of Earth Sciences
Groundwater quality is a crucial parameter for sustainable wetland management. The evaluation of the aquifer vulnerability is important for the protection of groundwater resources. The DRASTIC model is the most significant technique for the assessment of aquifer vulnerability. This study aimed to build a vulnerability map for groundwater of the Salda Lake wetland basin by DRASTIC method in a GIS environment. Seven environmental parameters (depth to water table, net recharge, aquifer media, soil media, topography, impact of the vadose zone media, and hydraulic conductivity of the aquifer) were used in the DRASTIC method and GIS was used to constitute a …
Daily Variations In Stratification In İzmit Bay, Hüsne Altiok, Lalehan Can, Sabri̇ Mutlu
Daily Variations In Stratification In İzmit Bay, Hüsne Altiok, Lalehan Can, Sabri̇ Mutlu
Turkish Journal of Earth Sciences
We studied the diurnal variation of stratification in İzmit Bay with temperature and current velocity, and investigated the influence of atmospheric conditions. In the east of the bay entrance, 10-min temperature and hourly current measurements were made between the dates of 4 February 2015 and 24 April 2015, down to about 40 m depth in the water column. In addition to this, hourly temperature and salinity with depth data were collected between the dates of 4 and 7 February 2015 by a research vessel. The meteorological parameters for the atmospheric conditions were obtained from the closest weather stations (Yalova, Çınarcık, …
Nature Of Clays In Late Cretaceous Dacitic Rocks In The Eastern Sakarya Zone (Ne Turkey):A Geochemical And Isotopic Approach, Ferkan Si̇pahi̇, Mehmet Ali̇ Gücer, Münür Burhan Sadiklar
Nature Of Clays In Late Cretaceous Dacitic Rocks In The Eastern Sakarya Zone (Ne Turkey):A Geochemical And Isotopic Approach, Ferkan Si̇pahi̇, Mehmet Ali̇ Gücer, Münür Burhan Sadiklar
Turkish Journal of Earth Sciences
Late Cretaceous felsic rocks are common in the eastern Pontides (NE Turkey). These rocks developed as an island arc from the Jurassic to the Miocene; they also host numerous volcanogenic massive sulfide deposits. The Late Cretaceous dacites that outcrop around Zigana Mountain (Gümüşhane, NE Turkey) were exposed to intensive hydrothermal alteration. Widespread hydrothermal alteration of Late Cretaceous dacite in Zigana Mountain has led to the formation of well-developed clay minerals. Their main alteration products are sericite, chlorite, and carbonates (ankerite and calcite). The clay minerals identified by X-ray diffraction and differential thermal analysis include illite, chlorite, small amounts of kaolinite, …
Heavy Metal Contamination In Groundwater And Surface Water Due To Active Pb-Zn-Cumine Tails And Water-Rock Interactions: A Case Study From The Küre Mine Area (Turkey), Tülay Ekemen Keski̇n, Emre Özler
Heavy Metal Contamination In Groundwater And Surface Water Due To Active Pb-Zn-Cumine Tails And Water-Rock Interactions: A Case Study From The Küre Mine Area (Turkey), Tülay Ekemen Keski̇n, Emre Özler
Turkish Journal of Earth Sciences
This study aimed at elucidating the groundwater and surface water pollution resulting from water-rock interaction, mine tailings, and mining activities at Küre (Kastamonu) sulfidic Pb-Zn-Cu mine area and its vicinity. The study area has a surface area of approximately 2990 km2. The Küre River drainage site covering the study area is approximately 440 km2. The concentrations of SO4, Al, As, Ba, Mn, Ni, Sb, and Pb in some groundwater (K10, K20, K21, K27, K28, K29, K30), and surface water (KR3) exceed the maximum limit values with respect to the Turkish Standards for Water Intended For Human Consumption and World Health …
New Geosite Candidates From Urla (İzmir, Western Anatolia, Turkey): A List Of Geologicalassets Nested With Antique And Modern Cultural Heritage, Ökmen Sümer, Mehmet Akbulut, Hülya İnaner
New Geosite Candidates From Urla (İzmir, Western Anatolia, Turkey): A List Of Geologicalassets Nested With Antique And Modern Cultural Heritage, Ökmen Sümer, Mehmet Akbulut, Hülya İnaner
Turkish Journal of Earth Sciences
The Urla Basin is an approximately 20 km wide and 30 km long N-S-trending strike-slip basin, located in the westernmost part of the Western Anatolia Extensional Province. Although the basin-fill units are generally composed of sedimentary and volcanic rocks of Miocene to Recent, Triassic and Late Cretaceous-Paleocene sedimentary rocks are also exposed in the middle and western part of the basin. In addition to this geological diversity, the basin hosts many ancient settlements due to its geographical position and close contact with the Aegean Sea. This study mostly focuses on the northern part of the basin with a concentration on …
Eocene-Oligocene Succession At Kıyıköy (Midye) On The Black Sea Coast In Thrace, Aral I. Okay, Michael D. Simmons, Ercan Özcan, Stephen Starkie, Michael D. Bidgood, Andrew R.C. Kylander-Clark
Eocene-Oligocene Succession At Kıyıköy (Midye) On The Black Sea Coast In Thrace, Aral I. Okay, Michael D. Simmons, Ercan Özcan, Stephen Starkie, Michael D. Bidgood, Andrew R.C. Kylander-Clark
Turkish Journal of Earth Sciences
A belt of Upper Eocene-Lower Oligocene marine sedimentary rocks extends from Kıyıköy on the Black Sea coast to Pınarhisar in the Thrace Basin, suggesting a marine connection between the Black Sea and the Thrace Basin during this period. The Cenozoic succession of this marine corridor was studied in the vicinity of Kıyıköy along two measured stratigraphic sections. The sequence lies unconformably over metamorphic basement rocks and consists of ~75 m of bioclastic limestone and sandstone of the Soğucak Formation, overlain by ~40 m of limestone, marl, mudstone, sandstone, and acidic tuff, which are assigned to the newly defined Servez Formation. …
Resource Estimation For Alpagut-Dodurga Coal Field And Determination Of Spatial Distribution Of Coal Quality Parameters, Yavuz Gül, Oğuzhan Küçükkarasu
Resource Estimation For Alpagut-Dodurga Coal Field And Determination Of Spatial Distribution Of Coal Quality Parameters, Yavuz Gül, Oğuzhan Küçükkarasu
Turkish Journal of Earth Sciences
In this study, coal seams of the Alpagut-Dodurga coal field, located in one of Anatolia's most important Tertiary-aged basins of the Çankırı-Çorum Basin, were modeled in 3 dimensions by using Netpro/Mine software and geostatistical methods for the estimation of resource amount. Additionally, the spatial distributions of coal quality parameters (lower calorific value, ash content, and moisture content) were determined using the same software and mapped thematically. Mining activities with inaccurate methods and planning lead to unacceptable reserve losses. The selection and planning of effective and economic production methods could be possible with three-dimensional modeling, accurate determination of spatial distributions of …
Coseismic Surface Deformation And Fault Model Of The 27 May 2017 Mw 5.2 Saruhanlı-Manisa (Western Turkey) Earthquake From Insar, Ahmet Murat Akoğlu
Coseismic Surface Deformation And Fault Model Of The 27 May 2017 Mw 5.2 Saruhanlı-Manisa (Western Turkey) Earthquake From Insar, Ahmet Murat Akoğlu
Turkish Journal of Earth Sciences
The shortened revisit times and accurate orbits of the new generation of radar satellites like Sentinel-1 improved the applicability of the synthetic aperture radar interferometry (InSAR) technique to investigate more moderate size events. Here the technique is used to characterize the 27 May 2017 Mw 5.2 Saruhanlı (Manisa) earthquake that took place in western Turkey in the Gediz Graben. Though seismological focal mechanism solutions of the earthquake clearly indicated that the event is due to normal faulting, the nodal plane ambiguity and the presence of two closely located faults in the epicentral region prevented the assessment of the causative fault. …
Zircon U-Pb Age And Hf Isotopic Composition Of The Carboniferous Gönen Granitoid Inthe Western Sakarya Zone Of Turkey, Firat Şengün, Osman Ersi̇n Koralay, Magnus Kristoffersen
Zircon U-Pb Age And Hf Isotopic Composition Of The Carboniferous Gönen Granitoid Inthe Western Sakarya Zone Of Turkey, Firat Şengün, Osman Ersi̇n Koralay, Magnus Kristoffersen
Turkish Journal of Earth Sciences
The Gönen granitoid is exposed in the western Sakarya Zone and is overlain unconformably by a Jurassic succession. The medium to coarse-grained Gönen granitoid has mineral assemblage of K-feldspar, plagioclase, quartz, muscovite, and biotite. Accessory phases are apatite and zircon. In this study, zircon U-Pb age is combined with Lu-Hf isotopes, which are presented to reveal the magma source and possible petrogenetic processes that took place during the formation of the parental magma for the Gönen granitoid. U-Pb dating of magmatic zircons yielded a concordia age of 336.3 ± 2.9 Ma referring to the early Carboniferous crystallization age of the …
Fluvio-Karstic Evolution Of The Taşeli Plateau (Central Taurus, Turkey), Muhammed Zeynel Öztürk
Fluvio-Karstic Evolution Of The Taşeli Plateau (Central Taurus, Turkey), Muhammed Zeynel Öztürk
Turkish Journal of Earth Sciences
Uplift history is an important factor in the structural patterns and karstification of the Taşeli Plateau. The morphological development of the study area consists of five stages according to its sedimentation, rotation, uplift, and climatic properties. (1) Shallow carbonates accumulated during the Early Miocene. (2) An emersion and drainage network developed as a result of the compressional neotectonic regime in the Late Miocene. (3) Dense joint systems were formed due to the ~40° clockwise rotation of the eastern limb of the Isparta Angle. (4) The climate of the study area changed as a result of rapid uplift from Late Pliocene …
Geochemical, Stable (O, C, And B) And Radiogenic (Sr, Nd, Pb) Isotopic Data From Theeskişehir-Kızılcaören (Nw-Anatolia) And The Malatya-Kuluncak (E-Central Anatolia)F-Ree-Th Deposits, Turkey: Implications For Nature Of Carbonate-Hosted Mineralization, Okay Çi̇men, Loretta Corcoran, Corinne Kuebler, Stefanie Simonetti, Antonio Simonetti
Geochemical, Stable (O, C, And B) And Radiogenic (Sr, Nd, Pb) Isotopic Data From Theeskişehir-Kızılcaören (Nw-Anatolia) And The Malatya-Kuluncak (E-Central Anatolia)F-Ree-Th Deposits, Turkey: Implications For Nature Of Carbonate-Hosted Mineralization, Okay Çi̇men, Loretta Corcoran, Corinne Kuebler, Stefanie Simonetti, Antonio Simonetti
Turkish Journal of Earth Sciences
In Turkey, the largest fluorine (F)-rare earth element (REE)-thorium (Th) deposits are located within the Eskişehir-Kızılcaören (north-western Anatolia) and the Malatya-Kuluncak (east-central Anatolia) regions, and these are associated with Oligocene extensional alkaline volcanic and Late Cretecaous-Early Paleocene postcollisional intrusive rocks, respectively. In the Kızılcaören region, the basement units include the Triassic Karakaya Complex and the Late Cretaceous oceanic units (Neotethyan suture) that are cut and overlain by phonolite and carbonatite intrusions and lava flows. In the Kuluncak region, the plutonic rocks are mainly composed of syenite, quartz syenite, and rare monzonite, and these cut the late-Cretaceous Karapınar limestone, which hosts …
A Pelagic Upper Devonian Sequence In Sarıyer, İstanbul, Aral I. Okay, Ayşe Özdemi̇r, Ni̇lgün Okay
A Pelagic Upper Devonian Sequence In Sarıyer, İstanbul, Aral I. Okay, Ayşe Özdemi̇r, Ni̇lgün Okay
Turkish Journal of Earth Sciences
The Palaeozoic sequence in the İstanbul region is made up of a continuous transgressive sedimentary series extending from Ordovician continental clastic rocks to Lower Carboniferous turbidites. The middle part of this sequence consists predominantly of carbonates ranging from shallow marine Upper Silurian limestones to latest Devonian to earliest Carboniferous deep marine limestones and shales. Here, we describe a new Upper Devonian deep marine limestone-siltstone section from the Sarıyer region in the European part of İstanbul. The 37-m thick section located in the campus of the İstanbul Technical University consists at the base of dark micritic limestones interbedded with carbonate-rich siltstones, …
Evolution Of Two Overlapping Sand-Rich Clastic Submarine Fans In The Lower Mioceneadana Basin, Southern Turkey: Contribution From A New Palaeocurrent Analysis, Daniel Bayer Da Silva, Bryan Cronin, Hasan Çeli̇k, Karin Goldberg, Benjamin Christopher Kneller, Kemal Gürbüz
Evolution Of Two Overlapping Sand-Rich Clastic Submarine Fans In The Lower Mioceneadana Basin, Southern Turkey: Contribution From A New Palaeocurrent Analysis, Daniel Bayer Da Silva, Bryan Cronin, Hasan Çeli̇k, Karin Goldberg, Benjamin Christopher Kneller, Kemal Gürbüz
Turkish Journal of Earth Sciences
A complete longitudinal profile from the continental shelf break to the basin floor includes a significant and well-exposed turbidite system at the northern edge of the Adana Basin, one of a series of foreland basins in southern Turkey. This study focused on the evolutionary interpretation of 2 coeval submarine fans, the Western Fan and the Eastern Fan, in the Upper Burdigalian-Lower Serravallian Cingöz Formation. The Western Fan was fed by a single major canyonised feeder from the west, and the Eastern Fan was fed by multiple feeder channels to the north. The Western Fan originated as a confined system with …
Determination Of Deformations By Using The Psi Technique At A Common Dump Site Ofthree Different Open-Pit Marble Mines In Turkey, Fati̇h Poyraz, Yavuz Gül, Burakhan Duymaz
Determination Of Deformations By Using The Psi Technique At A Common Dump Site Ofthree Different Open-Pit Marble Mines In Turkey, Fati̇h Poyraz, Yavuz Gül, Burakhan Duymaz
Turkish Journal of Earth Sciences
Slopes are formed to carry out mining activities such as stripping, ore production, transportation, and waste management in open-pit mines. The instability of slopes is a potential source of risks for mine safety. An unexpected slope failure may damage people, buildings, and equipment in the immediate area. Moreover, it leads to the disruption of mining production and an increase in production cost. For this reason, the regular examination and systematic monitoring of slopes should be performed to determine the early warning signs of failure. Thus, it may be possible to reach acceptable risk levels and to plan and implement the …
Grain Size Distributions In Airborne Dust, River-Suspended Loads, And Marine Sedimentsfrom Southeastern Turkey (Ne Mediterranean Sea), Vedat Edi̇ger
Grain Size Distributions In Airborne Dust, River-Suspended Loads, And Marine Sedimentsfrom Southeastern Turkey (Ne Mediterranean Sea), Vedat Edi̇ger
Turkish Journal of Earth Sciences
Between February 2001 and January 2002, near the coast of Erdemli, southeastern Turkey, 7 airborne dust samples, 7 coastal river-suspended sediment samples, and 3 marine sediment cores were collected. The main objective of this study was to understand the interrelationships among the multisources, multitransportation paths, and changing depositional conditions around the continental shelf of the Lamas River delta. In addition to a detailed study of satellite photos to track atmospheric dust in the region, grain size analyses were conducted on airborne dust, riverine suspensions, and marine sediment (cores), and the results were interpreted using statistical data, such as mean, mode, …
Controls On Deep-Water Slope Channel Complex Fill, Propagation, Stacking, Andorientation In The Middle Eocene-Oligocene Kırkgeçit Formation, Elazığ, Eastern Turkey, Hasan Çeli̇k, Bryan Cronin
Controls On Deep-Water Slope Channel Complex Fill, Propagation, Stacking, Andorientation In The Middle Eocene-Oligocene Kırkgeçit Formation, Elazığ, Eastern Turkey, Hasan Çeli̇k, Bryan Cronin
Turkish Journal of Earth Sciences
Deep-water channels are well-exposed along the northern margin of the east-west oriented Late Paleocene to Oligocene Elazığ Basin of eastern Turkey. The deep-water slope channel complexes are characterised by their association with prominent normal faults, where they seem to have controlled their geometries at the northern margin. The channels were fed by coarse-grained sediment shed by subaqueous gravity flows such as high and low-density turbidity currents, and both cohesive and noncohesive debris flows, from elevated hinterland across narrow shelves and through canyons and gullies into the channels. The faulting and subsequent folding along the northern basin margin created a significantly …
Source Rock Potential And Depositional Environment Of The Lower Oligocene İhsaniyeformation In Nw Turkey (Thrace, Karaburun), Emilia Tulan, Reinhard F. Sachsenhofer, Gabor Tari, Rachel Flecker, Vanessa Fairbank, Magdalena Pupp, Ryan B. Ickert
Source Rock Potential And Depositional Environment Of The Lower Oligocene İhsaniyeformation In Nw Turkey (Thrace, Karaburun), Emilia Tulan, Reinhard F. Sachsenhofer, Gabor Tari, Rachel Flecker, Vanessa Fairbank, Magdalena Pupp, Ryan B. Ickert
Turkish Journal of Earth Sciences
The Lower Oligocene succession of the İhsaniye Formation, exposed at Karaburun on the Turkish (Thrace) coast of the Black Sea, provides insights into potential hydrocarbon source rock extent in the southwestern part of the Black Sea Basin. Presently, no detailed study of the İhsaniye Formation exists with regards to organic matter content and type. We analyzed 78 fine-grained samples from a c. 70-m-thick section near Karaburun. Relatively high total organic carbon (TOC) contents (average 1.45 wt.%) are present in the lower part of the İhsaniye Formation; the hydrogen index values reach a maximum of 252 mg HC/g TOC, indicating the …
Biostratigraphy And Paleoenvironments Of The Oligocene Succession(İhsaniye Formation) At Karaburun (Nw Turkey), Michael D. Simmons, Michael D. Bidgood, Paul G. Connell, Stjepan Coric, Aral I. Okay, David Shaw, Emilia Tulan, Jan Mayer, Gabor C. Tari
Biostratigraphy And Paleoenvironments Of The Oligocene Succession(İhsaniye Formation) At Karaburun (Nw Turkey), Michael D. Simmons, Michael D. Bidgood, Paul G. Connell, Stjepan Coric, Aral I. Okay, David Shaw, Emilia Tulan, Jan Mayer, Gabor C. Tari
Turkish Journal of Earth Sciences
The biostratigraphy and paleoenvironments of the İhsaniye Formation exposed at Karaburun in northwest Turkey is described based upon the study of abundant and well-preserved foraminifera, calcareous nannofossils and palynomorphs. The studied succession is Early Oligocene in age, with calcareous nannofossil zones upper NP21 (Subzone CNO1) to lower NP23 (Subzone CNO3) and planktonic foraminifera zones O1 (~P18) and O2 (~P19) represented, and palynological assemblages suggestive of zones D13 to D14a. Based on these new data, a revised interpretation of the stratigraphic succession is presented. Deposition was controlled by a now inverted normal fault, with deposition of older stratigraphy (upper NP21 to …
Middle Eocene High-K Acidic Volcanism In The Princes' Islands (İstanbul) And Itsgeodynamic Implications, Fati̇h Şen
Middle Eocene High-K Acidic Volcanism In The Princes' Islands (İstanbul) And Itsgeodynamic Implications, Fati̇h Şen
Turkish Journal of Earth Sciences
The rock assemblages of the Princes? Islands, which are located to the south of mainland İstanbul, are regarded as parts of the Lower Paleozoic quartz sandstones, although they were initially considered as volcanic rocks by Swan in 1868. They differ from quartz sandstones by their vesicular texture and are devoid of any stratigraphic layering. Their mineral constituents are plagioclase (30%-35%), feldspar (35%-40%), and quartz (20%-25%), corresponding to rhyolite. The crystallization age of the rhyolites is 45.66 ± 0.84 Ma on the basis of the U-Pb zircon data. They show high-K calc-alkaline affinity. On primitive-normalized spider diagrams, negative anomalies of Ba, …
The Stratigraphy Of The Oligocene-Lower Miocene Deposits Of Southern Ukraine, Yuliia V. Vernyhorova, Tamara S. Ryabokon
The Stratigraphy Of The Oligocene-Lower Miocene Deposits Of Southern Ukraine, Yuliia V. Vernyhorova, Tamara S. Ryabokon
Turkish Journal of Earth Sciences
Lithostratigraphic units (formation, strata, and beds) and regional stages of the Oligocene-lower Miocene succession of southern Ukraine are described based on the results of comprehensive lithological and paleontological data analysis. The historical perspective on the stratigraphical investigations of the Maikop Group in the Crimean and Kerch Peninsulas and their equivalents in the broader Peri-Black Sea Region were also integrated in this overview. Moreover, a correlation was established between the locally defined regional stages and specific stratigraphic horizons of southern Ukraine, the global Oligocene and Miocene stages (defined by the International Stratigraphic Chart), and the stages of the Eastern Paratethys. The …
Facies Distribution, Paleoenvironment And Sequence Stratigraphy Model Of The Oligo-Miocene Asmari Formation (Fars Province, South Of Iran), Fereshteh Kamalifar, Mohsen Aleali, Vahid Ahamadi, Akram Mirzaiee
Facies Distribution, Paleoenvironment And Sequence Stratigraphy Model Of The Oligo-Miocene Asmari Formation (Fars Province, South Of Iran), Fereshteh Kamalifar, Mohsen Aleali, Vahid Ahamadi, Akram Mirzaiee
Turkish Journal of Earth Sciences
The Oligocene (Rupelian-Chattian) to Miocene (Aquitanian)-aged Asmari Formation is considered one of the most significant petroliferous reservoirs in the Middle East. The Oligocene-Miocene Asmari Formation represents diverse facies patterns in different parts of Zagros, so analysis of its facies in different provinces of the Zagros Basin is necessary. In this study, the sedimentary depositional sequences of Asmari Formation in the Firuzabad (south of Shiraz) and Bastak (west of Bandar-Abbas) sections in the Zagros Basin (Fras Platform) have been analyzed for distinguishing facies characteristics, interpreting the paleoenvironment and determining dominant depositional sequences. Based on field investigations and laboratory studies, 13 microfacies …
Sedimentary Characteristics Of Early Miocene Platform Deposits In The Neogene Adanabasin, Southern Turkey, Ülvi̇ Can Ünlügenç, Ahmet Can Akinci
Sedimentary Characteristics Of Early Miocene Platform Deposits In The Neogene Adanabasin, Southern Turkey, Ülvi̇ Can Ünlügenç, Ahmet Can Akinci
Turkish Journal of Earth Sciences
We report a detailed description of the sedimentological characteristics of the Early Miocene platform deposits to contribute towards the understanding of the evolution of the Neogene Adana Basin (southern Anatolia). Several detailed sedimentological logs were measured and interpreted from the platform deposits (Kaplankaya, Karaisalı, and turbiditic Cingöz formations) of the Adana Basin. The depositional evolution of the Adana Basin began during the Early Miocene as a foreland basin. The basin fill is both marine and nonmarine in character, which shows a gradual transition at the northern margin of the basin from one into another. Formation of the basin commenced by …
The Igneous Rock Intrusion Beneath Ambon And Seram Islands, Eastern Indonesia, Basedon The Integration Of Gravity And Magnetic Inversion: Its Implications For Geothermalenergy Resources, Richard Lewerissa, Sismanto Sismanto, Ari Setiawan, Subagyo Pramumijoyo
The Igneous Rock Intrusion Beneath Ambon And Seram Islands, Eastern Indonesia, Basedon The Integration Of Gravity And Magnetic Inversion: Its Implications For Geothermalenergy Resources, Richard Lewerissa, Sismanto Sismanto, Ari Setiawan, Subagyo Pramumijoyo
Turkish Journal of Earth Sciences
Ambon and Seram islands in eastern Indonesia are located in the convergence zone of three major plates, causing this area to have many geothermal manifestations on the surface. A subsurface geological study on Ambon and Seram has been conducted based on the integration of gravity and magnetic inversion modeling to determine the intrusion of igneous rock as a potential source of geothermal energy. The gravity and magnetic inversion utilized gravity and magnetic anomaly data from the World Gravity Map (WGM) and the Earth Magnetic Anomaly Grid (EMAG), as well as the CRUST 1.0 global earth crust model, as the constraints. …
Depositional Environment And Sequence Stratigraphy Of The Khoshyeilagh Formation Inbojnourd And Jajarm (Ne Iran), Fatemeh Jafarbeigloo, Mahmoud Reza Majidifard, Bahaeddin Hamdi, Afshin Asghari, Mehran Arian
Depositional Environment And Sequence Stratigraphy Of The Khoshyeilagh Formation Inbojnourd And Jajarm (Ne Iran), Fatemeh Jafarbeigloo, Mahmoud Reza Majidifard, Bahaeddin Hamdi, Afshin Asghari, Mehran Arian
Turkish Journal of Earth Sciences
In this study, depositional environment and sequence stratigraphy of the Khoshyeilagh Formation has been investigated in three stratigraphic sections including Pelmis, Robat-e Qarehbil, and Kuhe Ozon in the northeast of Iran. The thickness of the Khoshyeilagh Formation in these sections are 182, 260, and 463 m, respectively. Based on the facies analysis of the Khoshyeilagh Formation, 3 clastic facies, 11 carbonate facies, and 1 hybrid facies were identified. The vertical and lateral changes of the Khoshyeilagh Formation show a shoreface marine depositional environment that begins with alluvial sediments and continues by marine sedimentation. According to these changes, a homoclinal ramp …
Joint Modeling Of Rayleigh Wave Dispersion And H/V Spectral Ratio Using Pareto-Basedmultiobjective Particle Swarm Optimization, Ersi̇n Büyük, Ekrem Zor, Abdullah Karaman
Joint Modeling Of Rayleigh Wave Dispersion And H/V Spectral Ratio Using Pareto-Basedmultiobjective Particle Swarm Optimization, Ersi̇n Büyük, Ekrem Zor, Abdullah Karaman
Turkish Journal of Earth Sciences
Estimating the shear wave velocity and thickness of geologic units in a sedimentary structure is important for quantifying the local site effect caused by an earthquake. Inversion of the Rayleigh wave dispersion alone is sensitive to the absolute average shear wave velocity, while the H/V spectral ratio is sensitive to velocity contrasts. The solution of these models in a joint system using conventional inversion techniques suffers from difficulties while evaluating partial derivatives, dependencies to the initial model that is sometimes difficult to estimate, and trapping at a local minimum. Herein, a joint model using the Pareto optimality technique with multiobjective …