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Articles 37441 - 37470 of 302522

Full-Text Articles in Physical Sciences and Mathematics

Walkaway Vertical Seismic Profiling (Wvsp) Modeling And Imaging Study Along Faultedcoal Seams Over A High Velocity Limestone Model: A Synthetic Study, Cemal Erdemi̇r Jan 2022

Walkaway Vertical Seismic Profiling (Wvsp) Modeling And Imaging Study Along Faultedcoal Seams Over A High Velocity Limestone Model: A Synthetic Study, Cemal Erdemi̇r

Turkish Journal of Earth Sciences

The problem of collecting reflection data from the layers below a high velocity layer (HVL) and imaging those layers accurately is solved using walkaway vertical seismic profiling (WVSP) technique. The procedure is shown on a dataset from a model of highly faulted, thin-bedded coal layers separated by a high velocity layer of limestone. By locating the receivers above, in, and below the HVL, the reflections are expected to be recorded locally in situ in the borehole below the HVL before they travel back to the surface as in the case of surface seismic. The imaging results obtained from the model …

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Updated Geochemical And Geothermometry Study On Ömer-Gecek Geothermal Area (Afyonkarahisar/Turkey), Can Başaran, Yusuf Ulutürk, Ahmet Yildiz Jan 2022

Updated Geochemical And Geothermometry Study On Ömer-Gecek Geothermal Area (Afyonkarahisar/Turkey), Can Başaran, Yusuf Ulutürk, Ahmet Yildiz

Turkish Journal of Earth Sciences

The Ömer-Gecek region, one of the most critical geothermal areas of Afyonkarahisar, together with Western Anatolia, serves as a model for the integrated use of geothermal waters. As a result of the analysis made on the samples collected from the newly drilled wells, the chemical composition of the Ömer-Gecek geothermal waters, with a max temperature of 125 °C, has been determined as Na-Cl. The primary hydrochemical process affecting the chemical composition is silicate weathering. All the applied geothermometer methods showed that the water's maximum reservoir temperature was 120-130 °C. The calcite, dolomite, and aragonite minerals tend to precipitate. When compared …

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Detrital Composition Of Triassic To Neogene Sandstones In The Sulaiman Fold-Thrust Belt, Pakistan: Implications For Pre- And Postcollisional Evolution Of The Northwestern Indian Margin, Shazia Fareed, Akhtar Kassi, Aimal Kasi, Namik Aysal Jan 2022

Detrital Composition Of Triassic To Neogene Sandstones In The Sulaiman Fold-Thrust Belt, Pakistan: Implications For Pre- And Postcollisional Evolution Of The Northwestern Indian Margin, Shazia Fareed, Akhtar Kassi, Aimal Kasi, Namik Aysal

Turkish Journal of Earth Sciences

Sandstones of the Triassic through Pliocene successions of the western Sulaiman Fold-Thrust Belt (SFTB), Pakistan, were studied, by polarizing microscope and using point-counting techniques, to determine systematic variations in detrital modes. The sandstones in the study area are categorized into pre- and postcollisional sandstone assemblages. The precollisional assemblage was deposited before the onset of collision of India with Eurasia (starting Late Cretaceous-Early Paleocene) and subcategorized as Wulgai- Mughal Kot, Bibai and Pab subassemblages. The postcollisional assemblage was deposited after the onset of collision and categorized as Ghazij and Urak subassemblages. The Wulgai-Mughal Kot subassemblage mostly comprises of highly quartzose sandstones …

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Relative Tectonic Activity Assessment Of Kütahya Graben (Western Anatolia): Insights From Geomorphic Indices, Zeynep Kezer, Erman Özsayin Jan 2022

Relative Tectonic Activity Assessment Of Kütahya Graben (Western Anatolia): Insights From Geomorphic Indices, Zeynep Kezer, Erman Özsayin

Turkish Journal of Earth Sciences

Western Anatolia is known as one of the most seismically active regions in the world, consistent with earthquakes having a magnitude >6.0. The deformation in the region is predominantly controlled by normal faults, which play significant role on the morphological features as well as depositional processes in related grabens. WNW-trending Kütahya Graben is located at the northeastern part of this province and bounded by several N- and S-dipping active normal fault segments. This study aims to investigate the relative tectonic activity among the fault segments of the Kütahya Graben using geomorphic indices. The analyses of this study include mountain-front sinuosity …

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Holocene Sedimentary History Of South Danamandıra Lake: A Peatland In West Of İstanbul, Çatalca Peninsula, Nw Turkey, Özlem Makaroğlu, Melda Küçükdemi̇rci̇, Nurgül Karlioğlu, Dursun Acar, Ali̇ Gürel, Rüya Yilmaz Dağdevi̇ren, Nuretti̇n Yakupoğlu, Asen Sabuncu, Damla Şahi̇n Altun, Mustafa Ömer Karaöz, Memet Namik Çağatay Jan 2022

Holocene Sedimentary History Of South Danamandıra Lake: A Peatland In West Of İstanbul, Çatalca Peninsula, Nw Turkey, Özlem Makaroğlu, Melda Küçükdemi̇rci̇, Nurgül Karlioğlu, Dursun Acar, Ali̇ Gürel, Rüya Yilmaz Dağdevi̇ren, Nuretti̇n Yakupoğlu, Asen Sabuncu, Damla Şahi̇n Altun, Mustafa Ömer Karaöz, Memet Namik Çağatay

Turkish Journal of Earth Sciences

This study investigates the sedimentological evolution of the South Danamandıra Lake (SDL) lake in Çatalca Peninsula, 70 km west of İstanbul, using Georadar data and multiproxy analyses of five sediment cores. The lake is a 1.3-m deep, endorheic freshwater peatland, heavily colonised by common reed (Phragmites sp.). The multiproxy core investigations include a lithological core description and environmental magnetism, physical properties (gamma density and magnetic susceptibility), geochemical elemental, pollen and radiocarbon dating analyses. The lithological sequence in the lake consists of an upper peat unit and a lower sand-silt-clay unit. The peat unit is characterized by lower magnetic susceptibility, density …

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Late Ediacaran Inertial-Interchange True Polar Wander (Iitpw) Event: A New Road To Reconcile The Enigmatic Paleogeography Prior To The Final Assembly Of Gondwana, Bin Wen, Cairong Luo, Yong-Xiang Li, Yanting Lin Jan 2022

Late Ediacaran Inertial-Interchange True Polar Wander (Iitpw) Event: A New Road To Reconcile The Enigmatic Paleogeography Prior To The Final Assembly Of Gondwana, Bin Wen, Cairong Luo, Yong-Xiang Li, Yanting Lin

Turkish Journal of Earth Sciences

The Ediacaran to Early Cambrian plate tectonics was dominated by a full dispersal of the supercontinent Rodinia and the subsequent amalgamation of Gondwana. There is a consensus that the final assembly of Gondwana was not completed until the Early Cambrian. Prior to the final assembly, however, one major uncertainty remains on the quantitative paleogeography: the mainland of Gondwana was plausibly positioned at either a high or low latitude at a single time instant to meet the dual-latitude ('high-latitude' and 'low-latitude') options of Laurentia and the requirement of

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A Preliminary Account On Devonian Trilobites From Arabian Plate, Se Turkey, Catherine Cronier, İzzet Hoşgör Jan 2022

A Preliminary Account On Devonian Trilobites From Arabian Plate, Se Turkey, Catherine Cronier, İzzet Hoşgör

Turkish Journal of Earth Sciences

Recently, several Devonian localities and the related biota occurring from the southeastern Turkey were reinvestigated. Although, the Hakkari-Çukurca and the Diyarbakır-Hazro areas of the Arabian Plate are considered as an important source of the Devonian macrofossils from the north Arabian sector of Gondwana, the existing record of Devonian trilobites in these regions was hitherto unknown. We here report and illustrate for the first time Lower and Middle Devonian trilobites represented by three proetid pygidia and one calymenid pygidium. The morphological features of these pygidia suggest that they can be assigned to undetermined species of Gravicalymene (Calymenidae) and Podoliproetus (Proetidae), two …

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Devonian Parathuramminids From Taurides, Southern Turkey, Recep Özkan Jan 2022

Devonian Parathuramminids From Taurides, Southern Turkey, Recep Özkan

Turkish Journal of Earth Sciences

Devonian shallow marine carbonate rocks of the Taurides (southern Turkey) host rich and diverse faunal assemblages of foraminifera including unilocular organisms of the family Parathuramminidae. This study allowed investigating the calcareous unilocular parathuramminid fauna obtained from three measured stratigraphic sections Halevikdere, Kocadere and Eceli in addition to one detailed, shorter section measured along the Halevikdere section. The investigation revealed that the parathuramminid species, which commonly occur in lagoonal environments, are widely distributed throughout the studied sections. They mostly exist in limestone beds deposited in a time interval from Middle Devonian (Eifelian) to Late Devonian (Frasnian). However, their richness and diversity …

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Tectonomagmatic Reconstruction Of The Upper Mesozoic-Cenozoic Neotethyan Arcs In The Lut Block, East Iran: A Review And Synthesis, Reza Arjmandzadeh, Saeed Alirezaei, Alireza Almasi Jan 2022

Tectonomagmatic Reconstruction Of The Upper Mesozoic-Cenozoic Neotethyan Arcs In The Lut Block, East Iran: A Review And Synthesis, Reza Arjmandzadeh, Saeed Alirezaei, Alireza Almasi

Turkish Journal of Earth Sciences

The Lut Block in east Iran with a widespread record of arc-type Mesozoic-Cenozoic magmatic rocks is bordered by the Birjand (Sistan) ophiolitic assemblage to the east and the Sabzevar ophiolitic assemblage to the north. The nature and tectonomagmatic setting of these sutures and associated arcs are controversial. The geochemical attributes of the Upper Cretaceous-Paleogene intrusive and extrusive rocks in the central (CLB) and the northern Lut block (NLB) and in the Sabzevar ophiolite zone (SOZ), Late Cretaceous calc-alkaline and adakitic rocks to the east of the Sistan suture (CAS), and the Bazman intrusives to the west are consistent with a …

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A Case Study On Geomorphology: Tree-Ring-Based Confirmation Of The Formation Year Of Lake Kaindy After The 1911 Kemin Earthquake In Almaty (Kazakhstan), Ünal Akkemi̇k, Kuralay Mazarzhanova, Arailym Kopabayeva Jan 2022

A Case Study On Geomorphology: Tree-Ring-Based Confirmation Of The Formation Year Of Lake Kaindy After The 1911 Kemin Earthquake In Almaty (Kazakhstan), Ünal Akkemi̇k, Kuralay Mazarzhanova, Arailym Kopabayeva

Turkish Journal of Earth Sciences

Lake Kaindy, which is located in the Kazakhstan side of the Tien Shan Mountains is one of the most famous places in the World due to having sunken Picea schrenkiana Fisch. & C.A.Mey. trees within the Lake. The purpose of the study is to find the dead years of the sunken trees in the lake and therefore to confirm the formation time of Kaindy Lake, and if there is an effect of the 1911 Kemin earthquake on the tree-ring width of Picea schrenkiana around the lake. Eight wood pieces and two increment cores from the sunken trees were taken to …

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Vertical Variations Of Minerals In Clayey Sedimentary Rocks In The Cores Of Two-Deep Exploration Wells From The Kozlu Coalfield (Zonguldak, Nw Türkiye), With Emphasis On Tonstein (Schieferton) Formation, Ali̇ İhsan Karayi̇ği̇t, Emi̇ne Sütcü, Abi̇di̇n Temel, Mustafa Ni̇yazi̇ Gündoğdu Jan 2022

Vertical Variations Of Minerals In Clayey Sedimentary Rocks In The Cores Of Two-Deep Exploration Wells From The Kozlu Coalfield (Zonguldak, Nw Türkiye), With Emphasis On Tonstein (Schieferton) Formation, Ali̇ İhsan Karayi̇ği̇t, Emi̇ne Sütcü, Abi̇di̇n Temel, Mustafa Ni̇yazi̇ Gündoğdu

Turkish Journal of Earth Sciences

The majority of Turkish bituminous coal resources are located in the Zonguldak Basin. The Carboniferous coal seams in the Alacaağzı, Kozlu, and Karadon formations have received interest. However, the detailed mineralogical compositions of clayey sedimentary rocks in coal-bearing sequences in the basin have been limited. This study aims to investigate vertical variations of mineralogical compositions of Carboniferous and Early Cretaceous clayey sedimentary rocks cored in the two-deep exploration wells (K20/K and K20/H) from the Kozlu coalfield using XRD and SEM-EDX analyses data. In addition, a special interest is also given to tonstein layers identified within the Kozlu and Karadon formations. …

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Non-Parametric Stochastic Autoencoder Model For Anomaly Detection, Raphael B. Alampay, Patricia Angela R. Abu Jan 2022

Non-Parametric Stochastic Autoencoder Model For Anomaly Detection, Raphael B. Alampay, Patricia Angela R. Abu

Department of Information Systems & Computer Science Faculty Publications

Anomaly detection is a widely studied field in computer science with applications ranging from intrusion detection, fraud detection, medical diagnosis and quality assurance in manufacturing. The underlying premise is that an anomaly is an observation that does not conform to what is considered to be normal. This study addresses two major problems in the field. First, anomalies are defined in a local context, that is, being able to give quantitative measures as to how anomalies are categorized within its own problem domain and cannot be generalized to other domains. Commonly, anomalies are measured according to statistical probabilities relative to the …

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Simulation Of Urban Heat Island During A High-Heat Event Using Wrf Urban Canopy Models: A Case Study For Metro Manila, Ronald Gil Joy P. Bilang, Ariel C. Blanco, Justine Ace S. Santos, Lyndon Mark P. Olaguera Jan 2022

Simulation Of Urban Heat Island During A High-Heat Event Using Wrf Urban Canopy Models: A Case Study For Metro Manila, Ronald Gil Joy P. Bilang, Ariel C. Blanco, Justine Ace S. Santos, Lyndon Mark P. Olaguera

Physics Faculty Publications

This present study aims to determine the performance of using the Weather Research and Forecasting (WRF) Model, coupled with the urban canopy models (UCMs), in simulating the 2 m air temperature and 2 m relative humidity in Metro Manila. The simulation was performed during a high heat event on 22–29 April 2018, which coincided with the dry season in the Philippines. The four urban canopy model options that were used in this study include, the bulk (no urban), SLUCM, BEP, and BEM. The results of the simulations were compared with the hourly observations from three weather stations over Metro Manila …

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Stubborn Aerosol: Why Particulate Mass Concentrations Do Not Drop During The Wet Season In Metro Manila, Philippines, Miguel Ricardo A. Hilario, Paola Angela Bañaga, Grace Betito, Rachel A. Braun, Maria Obiminda L. Cambaliza, Melliza Templonuevo Cruz, Genevieve Rose Lorenzo, Alexander B. Macdonald, Preciosa Corazon Pabroa, James Bernard Simpas Jan 2022

Stubborn Aerosol: Why Particulate Mass Concentrations Do Not Drop During The Wet Season In Metro Manila, Philippines, Miguel Ricardo A. Hilario, Paola Angela Bañaga, Grace Betito, Rachel A. Braun, Maria Obiminda L. Cambaliza, Melliza Templonuevo Cruz, Genevieve Rose Lorenzo, Alexander B. Macdonald, Preciosa Corazon Pabroa, James Bernard Simpas

SOSE Affiliate: Manila Observatory

Wet scavenging is the most important sink for particulate matter (PM) and is expected to decrease PM concentrations in the wet season. However, Metro Manila, Philippines has highly similar PM mass across seasons despite large differences in seasonal rainfall. It is important to identify factors contributing to seasonally consistent PM mass as these may be present in similar developing megacities besides Metro Manila, leading to PM accumulation and posing significant health risks. We use size-resolved aerosol composition, aerosol optical depth, and meteorological data to reveal that the seasonally consistent PM mass in Metro Manila is due to (1) opposing seasonal …

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Greater Loss And Fragmentation Of Savannas Than Forests Over The Last Three Decades In Yunnan Province, China, R Sedricke Lapuz, Angelica Kristina M. Jaojoco, Sheryl Rose C. Reyes, Jose Don T. De Alban, Kyle W. Tomlinson Jan 2022

Greater Loss And Fragmentation Of Savannas Than Forests Over The Last Three Decades In Yunnan Province, China, R Sedricke Lapuz, Angelica Kristina M. Jaojoco, Sheryl Rose C. Reyes, Jose Don T. De Alban, Kyle W. Tomlinson

SOSE Affiliate: Manila Observatory

Yunnan Province, southwest China, has a monsoonal climate suitable for a mix of fire-driven savannas and fire-averse forests as alternate stable states, and has vast areas with savanna physiognomy. Presently, savannas are only formally recognised in the dry valleys of the region, and a no-fire policy has been enforced nationwide since the 1980s. Misidentification of savannas as forests may have contributed to their low protection level and fire-suppression may be contributing to vegetation change towards forest states through woody encroachment. Here, we present an analysis of vegetation and land-use change in Yunnan for years 1986, 1996, 2006, and 2016 by …

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Forging Ahead And Adapting To Change: A Review Of The Initiatives Of The Isprs Student Consortium, Sheryl Rose C. Reyes, Charmaine A. Cruz Jan 2022

Forging Ahead And Adapting To Change: A Review Of The Initiatives Of The Isprs Student Consortium, Sheryl Rose C. Reyes, Charmaine A. Cruz

SOSE Affiliate: Manila Observatory

The International Society for Photogrammetry and Remote Sensing Student Consortium (ISPRS SC) is an international organization that represents a constituency of the students and the young professionals with common interests and goals within ISPRS in the areas of photogrammetry, remote sensing and spatial information science. The ISPRS SC Board of Directors strengthened the organization’s foundations and increased its engagement in the Society from 2016 to 2022. Given the current global health crisis, selected members of the Board of Directors continued to serve in the ISPRS SC for a two-year extension and developed creative strategies in navigating the new normal. Building …

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Application Of Image Processing Programs In Color Analysis Of Wood Photodegradation, Gabriel Joseph D. Plata, Ramon M. Delos Santos Jan 2022

Application Of Image Processing Programs In Color Analysis Of Wood Photodegradation, Gabriel Joseph D. Plata, Ramon M. Delos Santos

Physics Faculty Publications

In general, polymer photodegradation is an important aspect of polymer science that is of great interest to chemistry, materials science, biology, and physics students who engage in this field of research. Wood consists of three main polymers, which makes it a good candidate for such photodegradation studies. Aside from structural changes based on chemical analysis, color change assessment can also be employed to check any extent of degradation on wood without the need for sophisticated analytical equipment. This study presents the application of two image processing programs in color analysis of wood photodegradation: ImageJ and Colormath library, which are Java-based …

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Online Algorithms With Advice For The 𝒌-Search Problem, Jhoirene B. Clemente, Henry N. Adorna, Proceso L. Fernandez Jr Jan 2022

Online Algorithms With Advice For The 𝒌-Search Problem, Jhoirene B. Clemente, Henry N. Adorna, Proceso L. Fernandez Jr

Department of Information Systems & Computer Science Faculty Publications

In the online search problem, a seller seeks to find the maximum price from a sequence of prices p1, p2,…, pn that is revealed in a piece-wise manner. The bound for all prices is well known in advance with m ≤ pί ≤ M. In the online k-search problem, the seller seeks to find the k maximum out of the n prices. In this paper, we present a tight bound of [Formula Presented] on the advice complexity of optimal online algorithms for online k-search. We also provide online algorithms with advice that use less than the required number of bits …

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Service Contracting As A Policy Response For Public Transport Recovery During The Covid-19 Pandemic: A Preliminary Evaluation, Varsolo Sunio, Wilhansen Joseph Li, Joemier Pontawe, Albert Dizon, Joel Bienne Valderrama, Agnes Robang Jan 2022

Service Contracting As A Policy Response For Public Transport Recovery During The Covid-19 Pandemic: A Preliminary Evaluation, Varsolo Sunio, Wilhansen Joseph Li, Joemier Pontawe, Albert Dizon, Joel Bienne Valderrama, Agnes Robang

Department of Information Systems & Computer Science Faculty Publications

We examine and assess the service contracting (SC) program implemented for the first time in Metro Manila, Philippines as a response to the impact of the pandemic on road-based public transport sector. We develop an evaluation framework, consisting of three indicators: social amelioration, increase in transport supply and performance improvement. These indicators are the purported objectives of SC. Using a mix of qualitative and quantitative methods, our evaluation suggests that although SC has brought positive impact in terms of the first two indicators, there is no robust evidence so far that may suggest that SC has improved the performance of …

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H^Soft Open Set In Soft Topological Space, S.M. Darwesh, A.A. Nasef, A.I. Aggour, A. Fathy Jan 2022

H^Soft Open Set In Soft Topological Space, S.M. Darwesh, A.A. Nasef, A.I. Aggour, A. Fathy

Al-Azhar Bulletin of Science

We introduce in this work, a novel concept in the realm of soft sets which is called h^ soft open set is presented. The foundational properties of this novel concept are explored, and its connections with various other soft set types are examined.

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Structural Interpretation And Petrophysical Approach For Subsurface Fractureidentification Of Joya Mair Area, Nw-Himalayas, Pakistan, Palwasha Shahzad Rathore, Muhammad Armaghan Faisal Miraj, Muhammad Bilal Malik, Sher Afgan, Rana Faizan Saleem, Shan Shahzad, Irza Akhtar Jan 2022

Structural Interpretation And Petrophysical Approach For Subsurface Fractureidentification Of Joya Mair Area, Nw-Himalayas, Pakistan, Palwasha Shahzad Rathore, Muhammad Armaghan Faisal Miraj, Muhammad Bilal Malik, Sher Afgan, Rana Faizan Saleem, Shan Shahzad, Irza Akhtar

Turkish Journal of Earth Sciences

Identification of fracture zone is a challenging task without the image log data. There are many brownfields around the world where the image log has not been acquired; therefore, there must be an alternative way of fracture identification. In this paper, a conventional log response technique for fracture delineation has been discussed. The study area lies in the Upper Indus Basin of Pakistan, which is sub-divided into the Kohat and Potwar basins. Minwal-X-1 of Joya Mair area, which lies in the Potwar Basin, is selected for this purpose. Eocene limestone units are formed due to fracture porosity. The objective of …

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Growth Of The Imbrication Zone Along The Southeast Anatolian Orogenic Belt: Evidencefrom Fission Track Thermochronology From Gölbaşı Region (Se Turkey), Yusuf Topak Jan 2022

Growth Of The Imbrication Zone Along The Southeast Anatolian Orogenic Belt: Evidencefrom Fission Track Thermochronology From Gölbaşı Region (Se Turkey), Yusuf Topak

Turkish Journal of Earth Sciences

One of the major components of continental collision zones is their imbricated zones. Such a zone along the Southeast Anatolian Orogenic Belt (SAOB) is solely controlled by a still-active convergence and accretion system between the Anatolian Plate and Arabian platform since at least Late Cretaceous. The zone is characterized by NEE/SWW-trending, northward-dipping thrust slices that are squeezed between the Tauride Block to the north and the Arabian platform to the south. The units cropping out within the zone comprise Neo-Tethysrelated magmatic, ophiolitic, sedimentary and metamorphic rocks with Late Cretaceous to Miocene formation/metamorphism ages. The Karanlıkdere granitoid intrudes into Late Cretaceous …

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The Active Fault Pattern Based On Morphotectonic And Structural Data In The South Ofulubat Lake And The Susurluk Valley Along The Southern Branch Of North Anatolian Faultzone: A Criticism Of The Bend Model In Northwest Anatolia, Gürol Seyi̇toğlu, Korhan Esat Jan 2022

The Active Fault Pattern Based On Morphotectonic And Structural Data In The South Ofulubat Lake And The Susurluk Valley Along The Southern Branch Of North Anatolian Faultzone: A Criticism Of The Bend Model In Northwest Anatolia, Gürol Seyi̇toğlu, Korhan Esat

Turkish Journal of Earth Sciences

Field observations and morphotectonic evaluations on the south of Ulubat Lake and the Susurluk valley show that the dominant active fault pattern consists of northeast-southwest and east northeast-west southwest right-lateral faults and northwestsoutheast normal faults developing between these strike-slip faults. We redefined the active faults in the south of Ulubat Lake and discovered that these northeast-southwest right-lateral faults control the route of Susurluk River. Based on these discoveries and evaluations, we can claim that the "bend model" previously proposed for the region is not valid, as seen in the Mustafakemalpaşa Fault and Balıkesir-Kepsut Fault examples. Instead, we suggest that the …

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Mineralogical, Petrological, And Geochemical Characteristics Of Şenkaya Chrysoprase,Turkey, Hami̇t Haluk Seli̇m, Aykut Güçteki̇n, Ferhan Şahi̇n, Mustafa Kaya, Beri̇l Kaya, Elanur Güner, Kami̇l Ömer Taş, Ahmet Karakaş, Yasemi̇n Kantarçeken Jan 2022

Mineralogical, Petrological, And Geochemical Characteristics Of Şenkaya Chrysoprase,Turkey, Hami̇t Haluk Seli̇m, Aykut Güçteki̇n, Ferhan Şahi̇n, Mustafa Kaya, Beri̇l Kaya, Elanur Güner, Kami̇l Ömer Taş, Ahmet Karakaş, Yasemi̇n Kantarçeken

Turkish Journal of Earth Sciences

Şenkaya chrysoprase is a gemstone and can be found near the Turnalı village located in the west-northwest of Şenkaya (Erzurum) county in the uplifted Kırdağ of Northeast Anatolia of Turkey. Chrysoprase only found in Şenkaya County and known with the same name commercially in Turkey is a light-dark green and cryptocrystalline structure gemstone encountered in the Örükyayla Mélange. Samples were collected from the field for defining mineralogical-petrographical, XRD, XRF, ICP-MS, optical cathodoluminescence microscopy (OCLM), FTIR-Raman and stable isotopic properties of Şenkaya chrysoprase. According to mineralogical and petrographic examination, Şenkaya chrysoprase has generally heterogeneous color distribution in macroscale and has 5 …

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Skill Assessment Of A High Resolution (1/72 Degree) Black Sea Ocean Model, Bi̇lge Tutak Jan 2022

Skill Assessment Of A High Resolution (1/72 Degree) Black Sea Ocean Model, Bi̇lge Tutak

Turkish Journal of Earth Sciences

The skill of a high-resolution Black Sea circulation model (ROMS) is assessed using the available satellite and field data for Sea Surface Height Anomaly (SSHA), Sea Surface Temperature, and CTD profiles. The model is configured to simulate the 9-year period between 2012 and 2021. The model's skill is assessed using standard analytical methods for error calculation such as Root Mean Square Error (RMSE) and correlation. Additionally, the model results are assessed using several more recent methods such as the relative operating characteristic (ROC). The results show that the model is capable of simulating daily mean SSHA with an RMSE value …

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Further Contribution To The Early Miocene Woody Flora Of Galatian Volcanic Provincefrom Doğanyurt Village, Ankara (Turkey), Ünal Akkemi̇k, Stanila Iamandei, Hakan Çeli̇k Jan 2022

Further Contribution To The Early Miocene Woody Flora Of Galatian Volcanic Provincefrom Doğanyurt Village, Ankara (Turkey), Ünal Akkemi̇k, Stanila Iamandei, Hakan Çeli̇k

Turkish Journal of Earth Sciences

The Galatian Volcanic Province (GVP) located in central-north Anatolia had a rich woody flora. The purpose of the present study is to contribute to the early Miocene woody flora of the GVP from two fossil sites from Doğanyurt Village of the city of Beypazarı in the Province of Ankara. The fossil sites, which are near to each other, have small pieces of fossil woods. Total 16 fossil woods were collected from two neighbour sites. Three thin sections as transversal, tangential and radial sections from each sample were taken, and they were identified microscopically. As a result, ten fossil species were …

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Stratigraphic Correlation Of The Givetian (Late Middle Devonian) Deposits In Qujing,Yunnan, Southwestern China And The Paleogeographic Implications, Jianhua Wang, Yunchuan Mi, Xiaorou Ma, Yukun Bi Jan 2022

Stratigraphic Correlation Of The Givetian (Late Middle Devonian) Deposits In Qujing,Yunnan, Southwestern China And The Paleogeographic Implications, Jianhua Wang, Yunchuan Mi, Xiaorou Ma, Yukun Bi

Turkish Journal of Earth Sciences

Detailed description of spatio-temporal framework of fossil-bearing strata is of fundamental significance for understanding the evolution of organisms and regional tectonics. The Qujing and Haikou formations are two lithological units exposed in eastern Yunnan, southwestern China, and both bear rich fossils indicative of a Middle Devonian age, while their relationship or lateral correlation remains unclear. Based on detailed observations of outcrops of these two formations in Qujing, eastern Yunnan, and as well as their typical rock characteristics and fossil contents, we propose that the two formations are basically contemporaneous heterotopic facies. From north to south of the Qujing area, the …

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Geochemical And Petrographic Approach For The Origin Of The Limestone Blocks Of Thewalls Of The Great Temple Of Hattusha, Çorum (N-Turkey), İsmai̇l Ömer Yilmaz, Andreas Schachner, İbrahi̇m Tonguç Uysal, Ezgi̇ Ünal İmer Jan 2022

Geochemical And Petrographic Approach For The Origin Of The Limestone Blocks Of Thewalls Of The Great Temple Of Hattusha, Çorum (N-Turkey), İsmai̇l Ömer Yilmaz, Andreas Schachner, İbrahi̇m Tonguç Uysal, Ezgi̇ Ünal İmer

Turkish Journal of Earth Sciences

The socle stones of the Great Temple in the Lower City of the Hittite capital city, Hattusha (Çorum Province) have been studied for the first time by petrographic and geochemical analysis (Sr isotope, stable isotope, and trace element geochemistry). Study objectives were to determine the carbonate facies of the stone samples used in the Great Temple and investigate their possible sources. Petrographic analysis of 10 limestone samples presents five clusters of different microfacies. Stable isotope (δ13C and δ18O) analysis displayed the presence of 5 groups in parallel with petrographic analysis. Trace element analysis of the same groups displayed considerable difference …

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Petrology, Geochemistry, And Geodynamic Implications Of The Ediacaran Volcanism Of The Southwestern Edge Of The Saghro Massif (Eastern Anti-Atlas, Morocco), Rachid Zahour, Ghalem Zahour, Hassan El Hadi, Youssef Zerhouni, Zouhair Baroudi, Mounia Khoukhouchi Jan 2022

Petrology, Geochemistry, And Geodynamic Implications Of The Ediacaran Volcanism Of The Southwestern Edge Of The Saghro Massif (Eastern Anti-Atlas, Morocco), Rachid Zahour, Ghalem Zahour, Hassan El Hadi, Youssef Zerhouni, Zouhair Baroudi, Mounia Khoukhouchi

Turkish Journal of Earth Sciences

The southwestern edge of the Saghro Massif experienced during the Ediacaran period an intense volcanic activity represented by basaltic andesites and acid rocks with ignimbritic dominance. The chemical characteristics of these rocks correspond to those of calc-alkaline orogenic magmatism related to a subduction zone. The genesis of these two rock groups does not seem to be controlled by the fractional crystallization process as a factor controlling their evolution. Partial melting of a lithospheric mantle still influenced by the Pan-African orogeny and a contaminated constituent of the lower continental crust is a likely source of the basaltic andesites. Ignimbrites represent the …

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A History Of Pistacia Lentiscus And Pinus Brutia Trees And Their Ecological Changes In The Güllük Bay (Muğla, Sw Turkey) During The Last 400 Years, Demet Bi̇lteki̇n, Georg Schwamborn, Kürşad Kadi̇r Eri̇ş, Dursun Acar, Bi̇kem Ekberzade, Zahra Hashemi̇, Nuretti̇n Yakupoğlu, Ali̇ Mohammadi̇, Ömer Yetemen Jan 2022

A History Of Pistacia Lentiscus And Pinus Brutia Trees And Their Ecological Changes In The Güllük Bay (Muğla, Sw Turkey) During The Last 400 Years, Demet Bi̇lteki̇n, Georg Schwamborn, Kürşad Kadi̇r Eri̇ş, Dursun Acar, Bi̇kem Ekberzade, Zahra Hashemi̇, Nuretti̇n Yakupoğlu, Ali̇ Mohammadi̇, Ömer Yetemen

Turkish Journal of Earth Sciences

In this study, we present pollen records together with a multiproxy analysis from a sediment core collected from the Güllük Bay (Bargilya Cove, Muğla, SW Turkey), covering the last 400 years. Pistachio shrubland was occupying around the Güllük Bay between 1613 and 1741 AD. However, after 1741 AD, the vegetation canopy suddenly changed and Turkish pine (Pinus brutia) was established. This supports that the main factor affecting the expansion of Pistacia lentiscus was precipitation rather than temperature after 1741 AD. This change is also indicated by high Sr-Ca values, reflecting arid conditions. Two anthropogenic phases developed in the region. The …

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