Arama Sonuçları

Listeleniyor 1 - 7 / 7
  • Öğe
    Menteşe dolomitlerinin petrografik özellikleri (Isparta)
    (e-Journal of New World Sciences Academy, 2010-04-01) Dinç, Salih; Özkan, Ali Müjdat
    İnceleme alanı Batı Toroslar’da Isparta Açısı içinde Kasımlar ve Karacahisar bölgesindeki yaklaşık 386 km2’lik bir alanı kapsamaktadır. Bu alanda Paleozoyik’ten günümüze kadar hemen her döneme ait sedimanter, mağmatik ve metamorfik kaya grupları yüzeylemektedir. Bu kaya gruplarından bir bölümü otokton konumlu olup, diğer bölümü ise allokton konumludur. Resiyen yaşlı Menteşe dolomitleri içerisindeki karbonatlı kayalar petrografik olarak 8 fasiyese ayrılmıştır. Bunlar, mikro boyutlu anhedral dolomit (Df1), orta-iri boyutlu anhedral dolomit (Df2), orta-iri boyutlu subhedral dolomit (Df3), iri-çok iri boyutlu öhedral dolomit (Df4), çamurtaşı fasiyesi (Kf1), vaketaşı fasiyesi (Kf2), istiftaşı fasiyesi 3 (Kf3), kristalin kireçtaşı fasiyesidir (Kf4). Menteşe dolomitleri içerisindeki dolomit kristallerinde yaygın olarak hipidiyotopik ve ksenotopik doku görülürken, kristallerin çoğu kirli bir görünüme sahiptir. Dolomitlerin bir kısmında ilksel dokunun kısmen korunduğu görülmektedir. Dolomit oluşumları, erken ve geç diyajenez esnasında meydana gelmiştir. Erken diyajenetik kökenli dolomitler karışım suyunda düşük sıcaklıklarda meydana gelmiştir. Geç diyajenezde oluşan dolomitler sığ gömülme esnasında yükselen sıcaklıklarda meydana gelmiştir.
  • Öğe
    Assessment of heavy metal pollution of urban soils of Batman by multiple pollution indices
    (Taylor & Francis, 2021-03-28) Baran, Hacı Alim; Gümüş Kıral, Nurcan
    Heavy metal accumulation is observed in urban soils, sometimes due to anthropological effects and sometimes due to natural geological units. In order to determine the heavy metal content of the Upper MioceneLower Pliocene Selmo Formation, which is observed in the whole study area and consists of conglomerate, sandstone and silt stone, soil and river sediment samples were taken. Within the scope of pollution assessment, geo-accumulation index (Igeo), enrichment factor (EF) and pollution index (PI) calculations of Batman urban soil samples were made and different degrees of pollution values were determined. High pollution values were obtained for As, Mo and Sb elements in all pollution indices calculated. The pollution levels of the three elements were determined as strongly to extremely contaminated according to Igeo values, the others except As (very severe enrichment) according to EF values were determined as severe enrichment, and according to PI, all three were determined as strong polluted. Pollution and element distribution maps were created with a geographical information system software. According to the results of correlation analysis and cluster analysis, the elements found to be contaminated are divided into two groups, whose locations and sources of contamination are different. The first group (Sn, Zn and Pb) is observed in the approximate centre of the study area and developed due to traffic emissions. The elements belonging to the second group (especially As, Mo and Sb) show high pollution values in the south-southeast of the study area. These pollutions are thought to be caused by the inadequate storage of mineral oils and batteries that are changed in the industrial site and from leaks in the oil production, storage, refining and transmission phase in TPAO, TÜPRAŞ and BOTAŞ. The analysed samples were compared with the Soil Pollution Control Regulation and WHO standards, and Co, Ni and As element values were found to exceed the permissible values for health
  • Öğe
    Geochemical features of the Menteşe Formation dolostones (Rhaetian) in the Karacahisar-Kasımlar area (Isparta-Turkey)
    (SpringerLink, 2018-08) Dinç, Salih; Özkan, Ali Müjdat
    The purpose of this study is to determine the geochemical characteristics of the Menteşe dolostones (Rhaetian) in the west Taurus Mountains, Turkey. The isotope characteristics of the Menteşe dolostones show a variation in the δ18O values of the dolomites between + 1.35 and − 2.72‰ (VPDB) and a variation in the δ13C values of the dolomites between + 1.6 and + 3.33‰ (VPDB). Most of the Menteşe dolostone samples have positive oxygen isotope values; others have weak negative isotope values, which indicate early diagenetic development. In addition, oxygen, carbon, and strontium isotopes and trace element analyses suggest that these dolostones were probably resulted from insignificant recrystallizaion process than chemically similar fluids. Furthermore, Mn/Sr values of the Menteşe dolostones indicate that there is no significant diagenetic alteration. The total REE contents of the Menteşe Formation dolostones display a strong positive correlation with Si, Al, Fe, K, Ti, Ba, Rb and negative correlation with Mg, hence REE content is associated with in the first degree titanium-bearing minerals (probably sphene, rutile, anatase), second degree phosphate (apatite), and barium and rubidium-bearing minerals (probably barite). Ce anomalies versus Nd concentrations of the Menteşe dolostone samples indicate that these dolostones are formed in an anoxic environment. In addition, the K/Rb ratios of the Menteşe dolostones are not exposed to any metamorphism and indicate some diagenetic alteration. Calculated temperature values using δ18O values of the Menteşe dolostones yield precipitation temperatures of 17 to 42 °C, and suggest burial depths of 67 to 900 m. Sources of magnesium for dolomitization of the Menteşe Formation carbonates were most likely fluids from seawater and/or diagenetic brines (slightly modified seawater). The Menteşe dolostones formed as early diagenetic (Rhaetian to Cenomanian) in shallow burial areas at lower temperatures than seawater and/or diagenetic brines (slightly modified seawater).
  • Öğe
    Petrographic characteristics of the Hacıalabaz formation dolomites (upper jurassic) ın the Bagbası (Hadım-Konya/Turkey) area
    (Cite Factor, 2011) Dinç, Salih; Özkan, Ali Müjdat
    The objective of this study is to determine the sedimentary properties of dolomites (Upper Jurassic) in terms of petrography, which belong to the Hacialabaz Formation existing at the surroundings of Bagbasi District lying at the south of Konya City. Dolomite, the unit formed with dolomitic limestone and limestone begins with gray or dark gray colored, moderate-thick layered, sugar textured dolomitic limestones including micritic intermediate layers at the bottom, and continues with gray colored, medium layered limestones through the upper parts. Dark gray colored, moderate-thick layered breccioid like appearing limestone at some layers and dolomitized intermediate layers form the upper parts. Hacialabaz Formation has begun to settle as the direct carbonate sedimentation in a transgression making sea after a long emerging period. Green algae like Clypeina jurassica, Cambelliella striata, Salpingoporella sp. and foraminifera fossils like Valvulina lugeoni, Kurnubia cf. palastiniensis, Valvulamina sp., Opthalmidium sp., Siphovalvulina sp., Haurania sp., Miliolidae were found in the Hacialabaz Formation settled in shallow-marine carbonate platform environment (tidal-subtidal and restricted lagoon). Eight dolomite-rock textures are recognized and classified according to crystal-size distribution and crystal-boundary shape. These is made of unimodal, very fine to fine-crystalline planar-s (subhedral) mosaic dolomite; unimodal, medium to coarse-crystalline planar-s (subhedral) mosaic dolomite; coarse to very coarse- crystalline planar-s (subhedral) dolomite; medium to coarse-crystalline planar-e (euhedral) mosaic dolomite; medium to coarse-crystalline planar-e (euhedral) dolomite; coarse to very coarse-crystalline non-planar-a (anhedral) dolomite; coarse to very coarse-crystalline non-planar-c (cement) dolomite; polymodal, planar-s (subhedral) to planar-e (euhedral) mosaic dolomite. Dolomitization is closely associated with the development of secondary porosity; dolomitization pre-and post-dates dissolution and corrosion and no secondary porosity generation is present in the associated limestones. The most common porosity types are non-fabric selective moldic and vuggy porosity and intercrystalline porosity. These porous zones are characterized by late-diagenetic coarse-crystalline dolomite, whereas the non-porous intervals are composed of dense mosaics of early-diagenetic dolomites. The distribution of dolomite rock textures indicates that porous zones were preserved as limestone until late in the diagenetic history, and were then subjected to late-stage dolomitization in a medium burial environment, resulting in coarse-crystalline porous dolomites. Hacialabaz dolomites have been formed as early diagenetic at the tidal-subtidal environment and as the late diagenetic at the shallow-deep burial depths.
  • Öğe
    Measuring the sediment thickness in urban areas using H/V spectral ratio method in Batman region, Southeast Turkey
    (SpringerLink, 2021-02-03) Dinç, Salih; Alpaslan, Nuray; Yılmaz, Salim
    In this study, microtremor records measured with a 3-component seismometer in Batman city center, which was established on the plain, were evaluated for the geological structure of the region and soil forming units. The measurements obtained from the field survey were evaluated with the Geopsy program by using the horizontal/vertical spectral ratio (Nakamura 1989) and the geological condition of the area and soil dominant frequency were determined. Soil characteristics of Batman City, which is geologically located on a plain, was evaluated by finding the loose units in the site with the map consisting of shear wave velocities (VS) found by applying the T = Σ4Hi /Vsi formula of Kanai (1983), which was developed for the soft soil layer on the bedrock, to the dominant frequency values (F0) obtained from the microtremor measured and soil classes corresponding to these values; and depth (H) and shear wave velocities (VS) were found by applying Formula (6) and the soil classes corresponding to these values. The dominant frequency at the measurement points and the lithology of the soil forming units were evaluated together to create dominant frequency maps of the region, and the relationship between the geology of the region and obtained microtremor measurements was discussed.
  • Öğe
    Production of mixed rare earth oxide powder from a thorium containing complex Bastnasite ore
    (Journals & Books, 2021-02) Özsaraç, Şafak; Kurşunoğlu, Sait; Hussaini, Shokrullah; Top, Soner; Ichlas, Zela Tanlega; Gökçen, Hasan Serkan; Kaya, Muammer
    The production of mixed rare earth oxide powder from a thorium containing bastnasite ore by sulfuric acid bake-water leaching followed by precipitation with oxalic acid and thermal decomposition of the oxalates was investigated. The sulfuric acid baking was performed at 250 °C and the optimum baking time was found to be 3 h. Using deionized water as lixiviant, 92.6% La, 86.8% Ce, 86.9% Pr, 82.3% Nd, 95.4% Th and 31% Y were dissolved from the baked ore at 25 °C after 30 min of leaching. The effect of solid-to-liquid ratio on the dissolution of the rare earth elements and thorium shows that when the solid ratio in the water increased from 1:10 to 1:3, the dissolution percentage decreased. The final mixed rare earth oxide powder contained 88.54% REO and 6% ThO2 together with small amounts of other impurities. The SEM mapping results revealed that the produced REO has an irregular crystal shape. Based on the experimental results obtained from the current study, a flowsheet was proposed for the production of mixed rare earth oxide powder from a specific complex bastnasite ore.
  • Öğe
    Şanlıurfa-Hacı Yadigâr Camii restorasyon amaçlı yapı malzemelerinin arkeometrik özelliklerinin incelenmesi
    (Türkiye Bilimler Akademisi, 2019-06-15) Aydın, Mahmut; Tetiker, Sema; Tanrıkulu, Hüseyin
    Hacı Yadigar Camii Şanlıurfa il merkezi’nde bulunmakta ve ilin en eski camilerinden biridir. Hacı Yadigar Camii, iç kapısı üzerindeki kitabedeki açıklamalarda yapının 1155 (hicri 550) ve 1514 (hicri 920) yıllarında restorasyonu yapıldı yazmaktadır. Şair Sabır tarafından yazılan kitabede ise son restorasyon tarihi 1871 (hicri 1288) olarak verilmiştir. Hacı Yadigar Camisi’nin 2018 tarihinde yapılması planlanan restorasyon projesinin hazırlanması aşamasında yapı malzemelerinin arkeometrik özelliklerinin tanımlanması amacıyla tahribatsız ve tahribatlı yöntemlerle analizler yapılmıştır. Yapıdan örnekler alınmış olup, bu örnekler üzerinde optik petrografi (polarizan mikroskop), X-ışınları difraksiyonu (XRD) ve jeokimyasal analizler (X-ışınları flöresans-XRF) yapılmıştır. Bu kapsamda caminin farklı bölümlerindeki yapı malzemelerini temsil eden 12 adet harç ve taş malzeme örnekleri toplanmıştır. Optik petrografik incelemelere göre kireçtaşları bütünüyle kalsit minerallerinden az miktarda ise kuvars, feldispat, kil, opak mineral, fosil kavkısı ve maserallerle temsil edilmektedir. XRD-Tüm kayaç (XRD-TK) inceleme sonuçlarına göre örneklerde kalsit, jips, kuvars, feldispat ve kil mineralleri saptanmıştır. Kireçtaşı olarak tanımlanmış olan yapı duvarları kalsit+jips bileşimi gösterirken, harç örneklerinde kalsit+kuvars±feldispat bileşenleri bulunmuştur. P-XRF sonuçlarına göre major elementler (Mg, Al, Si, K, Ca, Fe) ve metal olmayan (S) elementler tespit edilmiştir. Arkeometrik özelikleri belirlenen harç malzemelerinde restorasyonda 5-7% oranında tuğla kırığı ve/veya kum içeren kireç harçlarının, yapıtaşlarında ise uygun maseral (fusinit) içeren ilksel yapıtaşına uygun jeolojik formasyonun saptanarak bu yapıtaşlarının kullanılması önerilmektedir.