In this study, the petrographic and geochemical characteristics of Late Cretaceous-Middle Eocene Keban magmatic rocks were examined in Keban-Elazığ. Apart from the Keban Magmatic rocks, the other units outcropping around the region are the Late Devonian-Late Triassic Keban Metamorphics, Paleogene-Neogene sedimentary units and Plio-Quaternary alluviums. The investigated rocks are represented by syenite porphyry and quartzmonzonites belonging to Keban Magmatic rocks, which cut the Keban metamorphic rocks. The Keban Magmatic rocks consist of the main minerals are K-feldspar (mega-phenocrystal), plagioclase, amphibole, biotite and quartz minerals, which shows porphyric, porphyric holocrystalline, poikilitic texture in general. All the samples are shoshonitic in composition and fall into the A-type granitoid region. The tectonic environment of the investigated rocks is post-collisional granites.
In the vicinity of Konya (Turkey), mafic, micro‐porphyritic sub‐volcanic rocks intrude into the Mesozoic units, which represents the only example of such a rock type in the region. 40Ar/39Ar dating of two whole rock samples from the sub‐volcanics gave ages of 13.72±0.13 and 12.40±0.11 Ma, suggesting temporal association to the Late Miocene‐Pliocene high‐K calc‐alkaline volcanism in the region. The mineral chemistry and geochemical data permit us to classify the rocks as “minette” lamprophyres. They include diopside and phlogopite phenocrysts in a microcrystalline groundmass composed of sanidine, phlogopite, diopside and titano‐magnetite. Segregation and ocelli‐like globular structures occur commonly in the samples. In terms of major elements, the lamprophyres are calcalkaline, and potassic to ultrapotassic rocks. All the lamprophyres display strong enrichments in LILE (Rb, Ba, K, Sr), radiogenic elements (Th, U) and LREE (La, Ce) and prominent negative Nb, Ta, and Ti anomalies on primordial mantle‐normalized trace element diagrams. Geochemical data suggest that the lamprophyres and high‐K calc‐alkaline rocks in the region derived from a subduction‐modified lithospheric mantle source affected by different metasomatic events. Lamprophyric magmatism sourced phlogopite‐bearing veins generated by sediment‐related metasomatism via subduction, but high‐K calc‐alkaline magmas are possibly derived from a mantle source affected by fluid‐rich metasomatism.
Öz Bu çalışma, KOVİD-19 küresel salgın sürecinde dünyada ve Türkiye'deki yükseköğretim kurumlarının eğitim öğretim faaliyetlerinin yürütülmesinde başat rolü oynayan uzaktan eğitim uygulamalarını merkeze almaktadır. Bu minvalde çalışmanın amacı, küresel salgının hızlı ilerleyişinin paralelinde Yükseköğretim Kurulunun almış olduğu kararlar doğrultusunda Türkiye'deki pek çok üniversitenin kendisine rol model olarak kabul ettiği İstanbul Üniversitesinin 2019-2020 eğitim öğretim yılı bahar yarıyılı uzaktan eğitim tecrübesini incelemektir. Bu kapsamda İstanbul Üniversitesi Açık ve Uzaktan Eğitim Fakültesi koordinatörlüğünde yürütülen uzaktan eğitim süreci tüm yönleriyle birlikte anket çalışmalarının sonuçları ve diğer bazı sayısal veriler de kullanılarak irdelenecektir. Çalışmanın sonucunda, süreç içerisinde karşılaşılan tüm koşul ve gelişmeler ışığında 2020-2021 eğitim öğretim yılı için yenilikçi bir perspektif sunulmaya çalışılacaktır. Anahtar Kelimeler: KOVİD-19 küresel salgını • Dijitalleşme • Uzaktan öğretim • İstanbul Üniversitesi • Sağlık An Overview of Istanbul University's Distance Education Practices During the COVID-19 Pandemic Abstract This study centers on the distance education applications that have played a leading role in implementing educational activities conducted by higher education institutions in Turkey and around the world during the COVID-19 global pandemic. In this context, the purpose of this study is to examine educational experiences during the 2020 Spring Semester at Istanbul University, which has been regarded as the role model by many other Turkish universities for complying with decisions made by the Council of Higher Education in Turkey (CHE) in parallel with the rapid spread of the global pandemic. In this regard, the distance education processes coordinated by Istanbul University's Faculty of Open and Distance Education will be scrutinized in all aspects using the outcomes from questionnaires and other certain statistics. The study aims to help present an innovative perspective for the 2020-2021 academic year in light of all the circumstances and developments encountered during the COVID process.
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