Namık Aysal

İstanbul University-Cerrahpaşa

In this study, the heavy metal contamination in the soils of the selected upstate area of Tuzla District, which is located in the Anatolian side of Istanbul, Turkey, was investigated. The current status of the soil was evaluated using geo-accumulation index (Igeo), enrichment factor (EF), potential eco-logical risk (Er), risk index (RI), and pollut...

Radionuclides 226Ra, 232Th, and 40K can be found in various concentrations in the surface soil. High concentrations of radionuclides in the surface soil may cause radiological risks. This study investigated natural radioactivity levels and artificial radionuclide (137Cs) levels in the Istanbul University-Cerrahpasa, Avcilar region, Istanbul, Turkey...

In many ancient and active volcanic provinces, dyke systems are commonly disposed radially and concentrically around the volcanic chimney, represented by a central intrusive body in many eroded examples. In Istanbul, NW Turkey, late Cretaceous dykes, which are emplaced into the pre-Cretaceous basement consisting of sedimentary rocks of Palaeozoic a...

Ungrouped carbonaceous chondrites are not easily classified into one of the well-established groups due to compositional/petrological differences and geochemical anomalies. Type 2 ungrouped carbonaceous chondrites represent a very small fraction of all carbonaceous chondrites. They can potentially represent different aspects of asteroids and their...

The Strandja Massif is a key location for understanding the Paleozoic and Mesozoic tectonic evolution of the Tethyan Realm in the NW Turkey. Some researchers have suggested that the Strandja Massif is a part of the Cimmerian continent, but others consider it as a section of the southern passive continental margin of the Eurasia. Traditionally the m...

Fulgurites are naturally occurring structures that are formed when lightning discharges reach the ground. In this investigation, the mineralogical compositions of core and shell compartments of a rare, iron-rich fulgurite from the Mongolian Gobi Desert were investigated by X-ray diffraction and micro-Raman spectroscopy. The interpretation of the Ra...

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 post-collisional sandstone assemblages. Th...

The Cadomian Orogeny was active along the northern margin of Gondwanaland during the Late Neoproterozoic–Early Cambrian period. Remains of this orogenic activity are traced from Western Europe to the Himalayas, including some metamorphic basement rocks of Turkey. In this study, we provide new whole-rock and mineral chemistry, and zircon U–Pb age da...

Upper Carboniferous–lower Permian plutonic rocks (i.e. the Kula pluton) are exposed in Istranca (Strandja) Zone, NW Pontides on both sides of Turkish and Bulgarian border. The Kula pluton is composed of monzogranite, granodiorite, and quartzmonzodiorite facies with a medium to coarse-grained, mylonitic–blasto mylonitic texture. It was affected by l...

Oligo-Miocene volcanic rocks cover large areas in Western Anatolia and pass laterally into terrestrial sediments, and they have economic occurrences formed by the effect of active tectonism. Alteration of these rocks developed by hydrothermal solutions reaching the surface along the active tectonic zones and formed important kaolin deposits for the...

Microzonation for earthquake-induced liquefaction hazard is the subdivision of a territory at a municipal or submunicipal scale in areas characterized by the same probability of liquefaction manifestation for the occurrence of an earthquake of specified intensity. The liquefaction hazard at a site depends on the severity of expected ground shaking...

The seismic behaviour of a building on a liquefiable deposit is a complex interaction which involves quantifying both shaking induced damage and permanent ground deformation-related damage. In this paper the key parameters that influence both surface shaking and foundation settlements have been identified as the depth, thickness and liquefaction re...

ICP-OES and LA-ICP-MS instruments routinely used to assess the geochemical properties of the various natural and synthetic materials. In this contribution the analytical routines and method development procedures of the ICP-OES and LA-ICP-MS facilities installed at the Istanbul University-Cerrahpaşa Geological Engineering Department, Geochronology...

The Çanakkale meteorite was observed to fall near the (40°8′44″N; 26°24′23″E) Çanakkale city (the total mass is about 4 kg) in Western Turkey in 1946 and its mineralogy, petrography, geochemistry and mineral chemistry are described in this study. The petrography,mineral composition and mineral chemistry of silicate and opaque minerals were studied...

z: Gevreklik ve plastiklik terimleri sık oluşmuş doğal kırık zonlarını veya hidrolik çatlatma sırasındaki başarısızlığa meyilli olmayı tahmin için sıklıkla kullanılır. Yüksek silis, feldispat ve karbonat miktarı dış yükler altında doğal ve hidrolik çatlakların gelişimini üreten yüksek gevreklik sağlar. XRD tam kaya analizleri ile Siluriyen (Llandov...

In the last quarter of the century, advances in modern analytical instruments have found wide applications in geosciences. Whole-rock geochemistry, determination of isotope ratios and spot analyzes in single mineral grains have contributed significantly to the earth scientists’ understanding of past geological events and evolution of the earth. In...

Numerous Oligo-Miocene plutonic and associated aplite-pegmatite rocks occur in the Western Anatolian Magmatic Complex. However, only the plutons of Namazgah, Karadağ, Soğucak and Karadoru, in the Biga Peninsula, host three different types of tourmaline: disseminated, nodular, and vein-type. These all fall into the alkali subgroup and schorl-oxy-sch...

Cadomian magmatic activity is represented by a mafic – intermediate dyke suits in the Karacahisar dome (West – Central Taurides) formed by the southward subduction of the Proto-Tethyan ocean beneath North Gondwana. These dyke suites are classified as diabase, andesite and dacite. They display calc-alkali, high-K calc-alkali and shoshonitic characte...

Cadomian (Ediacaran–Cambrian) magmatic rocks have been reported in the eastern (e.g. the Çatalca and İhsaniye plutons) and western (e.g. the Binkılıç and Safaalan plutons) parts of the Istranca (Strandja) Massif. This paper aims to investigate the tectonic setting and the magma evolution history of the Cadomian magmatic rocks using both new and pre...

Hellenic subduction system governs the entire Aegean region by creating a migrating magmatic arc since the beginning of the Early Cenozoic. The Karadağ Pluton is situated in the NW part of Turkey and represents one of the distinct snapshots of this subduction system during the Upper Oligocene - Lower Miocene period. It consists of two major litholo...

Water resources are fundamental components of ecological life that must be maintained since they are at the risk of both pollution and depletion. Recently, one of the main factors threatening water resources is the groundwater salinization. In this study, electrical resistivity method via vertical electrical sounding (VES) technique and time-domain...

There are a number of volcanic eruption centres that form large caldera structures, and possibly feeding from relatively large magma chambers during the Miocene period in Western Anatolia. One of them is Yuntdağ volcano, and its products have formed a thick volcanic succession covering large areas. In this study, an area where the volcanic sequence...

İstanbul hosts large amount of historical buildings. Many of these buildings are made of limestone, fossiliferous limestone and clayey limestone widely known in the region as “Küfeki Stones”. In this study the effect of varying cleaning techniques on altered Küfeki stones was investigated. Within this respect, fresh Küfeki stone samples from origin...

Tarihi yapılarda kullanılan malzemeler ve bu malzemelerin nasıl bir araya getirildiğini gösteren yapım teknikleri, yapıların mevcut olan niteliklerine ek olarak önemli tarihi bilgiler sunar. Yapılarda farklı dönemlerde yapılmış olan inşa faaliyetleri ve müdahaleler, malzeme araştırmalarından elde edilen somut veriler ile anlamlandırılabilmektedir....

Byzantine emperor Iustinianus ordered the architects Anthemios and Isidoros to rebuild a new Hagia Sophia following the Nika revolt which destroyed Theodios’s Hagia Sophia basilica. The construction works started in 533-534 and was completed in a short period of 5 years and 10 months, and opened for worship in 27.12.537. Hagia Sophia, is the most m...

Ultramafic-mafic cumulate rocks often situated at deep root zones of the magmatic systems when they intruded into continental crustal areas. In rare occurrences, they can also intrude at the middle to upper portion of the crust and record the MASH processes developed within the crust. Yıldızdağ Gabbroic Intrusion (YGI) represents one of the rare oc...

Ayasofya naos döşemesinde ufak bir yer kaplayan ve mekânın güney doğu çeyreğinde bulunan renkli taşlarla bezemeli alan Omphalion adını alır. Kilisenin mabeyinci Pavlos tarafından ilk betimlemesinde gösterilmeyen döşeme planına aykırı düzeniyle de muhtemelen 11. yüzyılda yerleştirilmiştir. Antik Roma döneminde sık olarak kullanılan taşlar burada da...

Liquefact Project H2020-DRA-2015 Ga no. 700748 Deliverable Report D7.2

Liquefaction Project H2020-DRA-2015 Ga no. 700748 Deliverable Report D7.3

Limestones, fosilliferous limestones and clayey limestones widely known in the region as “Küfeki Stones” were used in many historical buildings in İstanbul. In this study the effect of sandblasting and laser cleaning techniques on altered Küfeki stones was investigated. Within this respect, fresh Küfeki stone samples from original building stone (B...

Fulgurites are vitrified or protocrystalline structures resulting from a lightning strike onto sandy soil, sand, rock or sediments. Frequently, fulgurites present a tubular form, though they may also appear as clumps or masses. In this investigation, X-Ray diffraction (XRD) studies are being undertaken in order to gather information on the mineralo...

Ground movements in Adapazari (Turkey) during the 1999 Kocaeli earthquake caused large devastations in the city, which were largely attributed to liquefaction of low plasticity silty soils underneath buildings with shallow foundations. In this study, CPT and laboratory test data were compiled adjacent to the liquefaction-induced damaged buildings....

Bursa meteoriti 1946 yılında Batı Türkiye’de Bursa şehri yakınlarına düşmüş ve bu çalışmada meteoritin mineralojisi, petrografisi, jeokimya ve mineral kimyası detaylı olarak tanımlanmıştır. Silikat ve opak minerallerin petrografisi, mineral bileşimi ve kimyası polarizan mikroskop, X-ışını difraktometre (XRD), taramalı elektron mikroskobu (SEM) ve e...

Batı Pontitlerde, İstanbul batısından Bulgaristan içlerine kadar Istranca Masifi metamorfik temeli içerisine yerleşmiş, farklı yaş konaklarında bir dizi granitik sokulumu bulunmaktadır. Bu kuşakta yer alan plutonlardan biri de, Saray’ın Kuzeydoğusunda yer alan Safaalan stoğudur. Safaalan stoğu; iri, eş taneli dokulu, belirgin foliasyonlu granit ve...

İnsan nüfusunun yoğun olduğu kentsel alanlar, insan ve endüstriyel faaliyetlerin etkisi ile pek çok çevresel sorunla karşı karşıya kalmaktadır. 2050 yılına kadar, tüm dünya nüfusunun üçte ikisinin şehirlerde yaşayacakları öngörüsü, kentlerin alt yapısının daha iyi planlanması gerekliliğini ortaya koymaktadır. Modem kentler, toksik metal kirlenmesi,...

Istranca Masifi’nin temel kayaçlannı kesen Şeytandere Metagraniti (Vize-Kırklareli), batı Pontidlerde konumlanmaktadır. Bu metagranitoyidler, kırıntılı metasedimanter temel kayaçla- nm keser durumda olup, Triyas yaşlı örtü metamorfitleri ve Eosen yaşlı Soğucak Formasyonu birimleri tarafından da uyumsuz olarak örtülmektedirler. Şeytandere Metagranit...

Bu çalışmada, Istranca masifindeki Kula plutonunun petrojenezi ve tektonik ortamını anlamak için yeni zirkon U-Pb yaşları ve tüm kayaç jeokimya verilerini sunuyoruz. Kula plutonu Türkiye ve Bulgaristan arasındaki sınırın her iki tarafında da yüzlek vermektedir. Temsilci zirkon U-Pb yaşları 310.1 ± 2.0 My ve 298.1 ± 1.7 My (Üst Karbonifer – Alt Perm...

The ancient city of Sagalassos, one of the most ancient settlement areas of Turkey, includes archaeological ruins which are important interms of building and decorative rocks. The city was built to the north of Ağlasun and on the tectonic units of Taurus Belt. This ancient city was built using stones from local places (e.g. Dutdere limestone, Gölcü...

Many contaminants such as heavy metals are dropped or discharged in the environment because of human activities. Due to the accumulation in soil, heavy metals can cause negative effects for living organisms. Consequently, the determination of heavy metals concentration and their ecological risks in soil is very important for human health. The major...

The Eğrigöz and Koyunoba monzogranites in western Turkey contain igneous enclaves that provide important information concerning the magma-forming processes and their petrogenetic origin in a core-complex setting. The Eğrigöz monzogranite differs from the Koyunoba monzogranite in that it displays a porphyritic texture and contains abundant amphibole...

Permian-Triassic magmatic rocks are widely exposed in different tectonic terranes and continental blocks in the Aegean region. This study is focussed on the İstanbul Zone and the Istranca (Strandja) Massif, which are located in the Western Pontides of NW Turkey. The Kırklareli and the Tepecik plutons intruded into the metamorphic basement rocks of...

Historical monuments are one of the most precious elements of world cultural heritage. Many historical monuments in ˙ Istanbul were constructed using natural stones widely named in the region as Küfeki stones which are originally composed of limestones, fosilliferous limestones and clayey limestones. These rocks exhibit different deterioration type...

The main objective of this study is the determination of the soil properties of Canakkale test site depending on the EU H2020 LIQUEFACT project titled “Liquefact: Assessment and mitigation of liquefaction potential across Europe: a holistic approach to protect structures/ infrastructures for improved resilience to earthquake-induced liquefaction di...

We report new U–Pb zircon ages, major and trace element data, mineral chemistry, and Sr–Nd isotopic analyses of the mafic–intermediate dykes and intrusions in the İstanbul Zone. Mafic dykes are represented by calc-alkaline to alkaline lamprophyre and diabase. Intermediate dykes and subvolcanics are andesitic to dacitic in composition and calc-alkal...

Upper Cretaceous volcano-sedimentary sequences of the Eastern Pontide orogenic belt, NE Turkey, are host to significant VMS mineralization, including near Tunca. The initial stages of felsic volcanism within the mineralized area are marked by the eruption of dacitic lavas and breccias of the Kızılkaya Formation. This was accompanied by the emplacem...

LIQUEFACT Project – EC GA no. 700748 Deliverable Report D2.1

We report new U-Pb zircon ages, major and trace element data, mineral chemistry and Sr–Nd isotopic analyses of the mafic – intermediate dykes and intrusions in the İstanbul zone. Mafic dykes are represented by calc-alkaline to alkaline lamprophyre and diabase. Intermediate dykes and sub-volcanics are andesitic to dacitic in composition and calc-alk...