Zircon typology study on the granitic glacial pebbles: A case study from the taurides (Turkey)

Gondwana’nın kuzey kenarına ait Geç Ordovisiyen buzul kayaçlarına, Torid’lerde ve Güneydoğu Anadolu Otokton Kuşağı’nda rastlanmaktadır. Bu çalışmada; Doğu Toridler’de Feke-Saimbeyli-Ceralan (Adana) (DPK-30), Feke-Gökmenler (Adana) (DPK-44) ve Orta Toridler’de Silifke-Ovacık (Mersin) (DPK-72) bölgelerinden alınmış olan granitik buzul çakıllarından ayrılmış zirkon mineralleri üzerinde zirkon tipolojisi ve zirkon doygunluk sıcaklığı araştırmaları yapılmıştır. Zirkon tipolojisi metoduna dayanarak; çalışılan örneklerden DPK-30 örneği kalk-alkalen özellik gösteren, mafik anklavlar içeren hibrit granitoyidler, DPK-44 örneği tamamıyla veya kısmen kıtasal kabuktan oluşan, eser miktarda mafik mikrogranüler ksenolit içeriği ve düşük manto katkısı sunan granitoyidler ve DPK-72 örneği ise alkalen serisi granitoyidler olarak tanımlanan, genellikle sub-volkanik ve anorojenik komplekslerde rastlanan sıcak ve susuz magma kaynağına işaret eden manto kaynaklı kayaçlar olarak tanımlanmıştır. Bu tanımlamalar, bu kayaçlar üzerindeki izotopik verileri de kapsayan öncel jeokimyasal değerlendirmelerle genel olarak uyumludur. Çalışılan granitik kayaçların oluşum sıcaklıkları; sırasıyla zirkon tipolojisi metodu ve zirkon doygunluk sıcaklığı hesabına dayanarak, DPK-30 için 750°C ve 789°C; DPK-44 için 700°C ve 845°C, DPK-72 için 650°C ve 790°C olarak önerilmiştir. Bu sıcaklık aralıkları kaynak alan olarak önerilen Sina Yarımadası ve Mısır Doğu Çölü civarındaki Neoproterozoyik yaşlı granitoyidlerin literatürdeki mevcut sıcaklık verileriyle benzerlik göstermektedir. Sonuç olarak; zirkon tipolojisi metodu ve zirkon doygunluk sıcaklığı çalışmalarının; diğer analitik verilerle birlikte değerlendirildiğinde, granitik buzul çakıllarının kaynak alanlarının saptanmasında faydalı olabileceği düşünülmektedir.The Late Ordovician glacial rocks from the northern part of the Gondwana are encountered in Taurides and Southeast Anatolia Autochtone Zone. In this study, zircon typology and zircon saturation temperature invetigations are performed on zircon minerals separated from the granitic glacial pebbles from the Feke-Saimbeyli-Ceralan and Feke-Gökmenler (Adana) areas in the east Taurides and SilifkeOvacık (Mersin) in the central Taurides. Based on the zircon typology method, among the studied samples, DPK-30 is described as calc-alkaline hybrid granitoids bearing mafic enclaves, DPK-44 is identified as granitoids formed from wholly or partly continental crust with rare mafic microgranular xenoliths and low mantle contribution, and DPK-72 is defined as alkaline series granitoids, which are mantle originated rocks observed in subvolcanic and anorogenic complexes pointing out to hot and dry magma source. These descriptions are generally agreeable with the previous geochemical assessments, including isotopic data, on these rocks. Formation temperatures of studied granitic rocks are suggested as 750°C and 789°C for DPK-30, 700°C and 845°C for DPK-44, and 650°C and 790°C for DPK-72, based on zircon typology method and by zircon saturation temperature calculation, respectively. These temperature ranges show similarities to the present temperature data in literature on the Neoproterozoic granitoids from the Sina Peninsula and the Eastern Egypt Desert. As a result, zircon typology method and zircon saturation temperature calculation studies, combined with the other analytical data, can be beneficial in determining the source regions of the granitic glacial pebbles

Zirkon jeokronolojisi ve mineral kimyası çalışmaları ile Ekecikdağ magmatik Birliği (Orta Anadolu) granitoyidlerinin yaşı, petrojenezi ve jeodinamik koşullarının araştırılması

TÜBİTAK ÇAYDAG01.08.200

Effect of sumac extract on serum oxidative status, RANKL/OPG system and alveolar bone loss in experimental periodontitis in rats

Objectives Sumac (Rhus coriaria L.) is widely used spice which has several properties such as antioxidant, anti-inflammatory and antimicrobial. The purpose of this animal study was to evaluate the effects of sumac extract on levels of receptor activator of nuclear factor-kappa B ligand (RANKL), osteoprotegerin (OPG) expression, serum oxidative status, and alveolar bone loss in experimental periodontitis. Material and Methods Twenty-four Wistar rats were separated into three groups: non-ligated (NL, n=8), ligature only (LO, n=8), and ligature and treated with sumac extract (S, n=8) (20 mg/kg per day for 11 days). A 4/0 silk suture was placed around the mandibular right first molars subgingivally; after 11 days, the rats were sacrificed, and alveolar bone loss was histometrically measured. The detection of RANKL and OPG were immunohistochemically performed. Levels of serum total antioxidant status (TAS)/total oxidant status (TOS), and oxidative stress index (OSI) were also analyzed. Results Alveolar bone loss was significantly greater in the LO group compared to the S and NL groups (

Laser Ablation Inductively Coupled Plasma Mass Spectrometry U-Pb Dating of Detrital and Magmatic Zircons of Glacial Diamictites and Pebbles in Late Ordovician Sediments of the Taurides and Southeast Anatolian Autochthon Belt, Turkey: Indications for Their Arabian-Nubian Provenance

Late Ordovician (Hirnantian) glacio-marine deposits in the Central and Eastern Taurides and Southeast Anatolian Autochthon Belt (SAAB) in Turkey are mainly composed of diamictites, subrounded granitic pebbles, and rounded/subrounded lonestone pebbles. The granitic pebbles are dated as 576.5 ± 3.3, 576.7 ± 5.7, 598.4 ± 7.5, 717.5 ± 8.0, 789.5 ± 3.7, and 964.6 ± 4.6 Ma. The geochemical signatures and dated granitic pebbles in the Central and Eastern Taurides are interpreted to have been derived from the Late Neoproterozoic granitoids/metagranitic rocks of the Arabian-Nubian Shield (ANS; the Sinai Peninsula and the Eastern Desert of Egypt). The youngest 206Pb/238U ages in the diamictites (499.1 ± 4.2 Ma in the SAAB, 530.5 ± 5.3 Ma in the Eastern Taurides, and 562.5 ± 5.4 Ma in the Central Taurides) and in the lonestones (528.2 ± 4.5 Ma in the Central Taurides, 530.8 ± 5.2 Ma in the Eastern Taurides) indicate that detrital zircons were directly transported mainly from the northern margin of Gondwana and/or Arabia during the Late Ordovician, not from peri-Gondwanan parts of the European margin. Kernel/probability density diagrams of zircon ages from the lonestone pebbles in the Eastern and Central Taurides are interpreted as evidence for their derivation from Late/Middle Cambrian siliciclastic rocks in the Israeli part of the Sinai Peninsula. The provenance of detrital zircon populations in the diamictites in the Central and Eastern Taurides is directly correlated with magmatic activity of the Elat (Taba)–Feiran island arc, the Sa’al island arc, and the postcollisional magmatic suites in the Sinai Peninsula (Egypt). However, the corresponding successions in the SAAB have more abundant Late Cryogenian age components, suggesting the Ha’il/Afif/Ad Dawadimi/Ar-Rayn terranes of the eastern Arabian Shield as their provenance. These distinctive age patterns indicate that glacio-marine successions in the SAAB had different paleogeographic positions than their equivalent units in the Central and Eastern Taurides during deposition of the Late Ordovician glacio-marine units

Gastrointestinal quality of life in patients with asymptomatic cholelithiasis after laparoscopic cholecystectomy

To assess the outcome of laparoscopic cholecystectomy for asymptomatic cholelithiasis before and after laparoscopic cholecystectomy using a specific quality of life instrument for gastrointestinal disorders in adults : The Gastrointestinal Quality of Life Index (GIQLI) was used to study the quality of life in patients before and after laparoscopic cholecystectomy : Seventy one patients completed the GIQLI questionnaire both preoperatively and after a minimum postoperative follow-up of three months. Mean preoperative score was 126.8±14.07 out of a theoretical maximum score of 144.After three months, the score had significantly improved to 136.6±9.31, close to the range for the normal population. Not only items assessing gastrointestinal symptoms but also the domains of physical, social, and emotional function improved significantly. The most marked improvements were achieved in patients with the lowest preoperative scores. Laparoscopic cholecystectomy significantly improves the quality of life in patients with cholelithiasis who are asymptomatic or have nonspecific gastrointestinal symptoms that cannot be explained by another gastrointestinal pathology.Bu çalısmada asemptomatik kolelitiyazis olgularının ameliyat öncesi ve ameliyat sonrası hayat kalitesi degerlendirilmistir. Hastaların ameliyat öncesi ve sonrası hayat kalitelerinin ölçümü gastrointestinal hayat kalitesi indeksi parametreleri kullanılarak belirlenmistir. Çalısmaya alınan 71 hasta ameliyat öncesi ve ameliyattan en az 3 ay sonra gastrointestinal hayat kalitesi indeksine göre sorgulanmıstır. Preoperatif dönemde ortalama skor 126.8±14.07, 3 ay sonra yapılan sorgulamada ise ortalama 136.6±9.31 olup normal populasyona yakın bir oranda saptanmıstır. (toplam skor 144). Gastrointestinal semptomlarının yanı sıra fiziksel, sosyal ve duygusal durumlarında da anlamlı düzelme gözlenmistir.Düsük skorlu hastalarda bu iyilesmedaha belirgindir. Asemptomatik kolelitiyazisli hastalarda baska gastrointestinal patolojilerle açıklanamayan nonspesifik semptomların laparoskopik kolesistektomiyle iyilesme gösterdigi, hastaların hayat kalitelerinde anlamlı bir artıs oldugu görülmektedir

Orta Anadolu'daki(Türkiye) granitoyidlerin zirkon tipolojisi ve kimyası

This thesis investigates the morphological, chemical and growth characteristics of zircon mineral in relation with the granitoid petrology. Physical and chemical variations recorded within zircon crystals during evolution of the Central Anatolian Granitoids are discussed. The thesis focuses on twelve granitoid samples from the Ekecikdag, Agaçören and Terlemez regions from western part of central Anatolia. These granitoids are differentiated into S- and H-type granitoids on the basis of field, petrographical and whole-rock geochemical aspects. In granitoids concerned, zircon is associated with biotite, allanite and plagioclase, and zircon populations mainly comprise P- and S-type zircon crystals, with rare G-, L- and J-types. Typology method combined with cathodoluminescence imaging revealed that S- and H-type granitoids show intrusive aluminous autochthonous and hybrid character, respectively. Zircons generally have euhedral to subhedral cores exhibiting zoning, although sometimes faint, but inherent and embayed cores also exist. Large scale, first order, and/or small-scale second order oscillatory zoning and effects of late stage recrystallization are observed within zircon crystals. Multi-corrosion zones within zircons are characterized by sharp changes in crystal forms with decreased Zr and Si, and increased U, Th and REE+Y contents, beside infrequent increase in Hf, Sc, Ta, Ti, Ca, Al and Fe elements. These zones are interpreted to be formed by transient heating of the resident felsic magma due to mafic melt contribution, at the time of mixing/mingling processes of the H-type granitoids, and then zircons re-grow in magma source reflecting a mafic character. Corrosion stages within zircons of S-type granitoids, on the other hand, were probably formed by mantle-derived melts producing heat for resorption of zircons without direct contribution.Ph.D. - Doctoral Progra

The Upper Cretaceous intrusive rocks with extensive crustal contribution in Hacimahmutusagi Area (Aksaray/Turkey)

The Hacimahmutusagi area (Aksaray/Turkey) is located in the western part of the Central Anatolian Crystalline Complex (CACC). Gneiss and marble compose the basement units, while intrusive rocks are gabbros and granitoids. The pegmatitic hornblende gabbros contain pegmatitic to fine-grained hornblendes, plagioclase, clinopyroxene, and accessory opaque minerals. The fine-grained gabbros, on the other hand, are composed of plagioclase, hornblende, and biotite as major components whereas the apatite and opaque minerals are present in accessory content. Granitic granodioritic rocks are the common intrusive rock types in the area, and constitute quartz, orthoclase, plagioclase and biotite, and accessory zircon and opaque minerals. Leucogranites, comprising quartz, orthoclase, plagioclase with minor biotite, hornblende, and with accessory apatite and opaque minerals, are found as dykes intruding the marble and the granitic-granodioritic rocks. Strontium neodymium isotope data of gabbros and granitoids have high Sr-87/Sr-86((i)) ratios (0.7076 to 0.7117) and low epsilon Nd-(i) values (-5.0 to -9.8) point out enriched source and pronounced crustal contribution in their genesis. In the Hacimahmutusagi area, it is plausible that the heat increase caused by the hot zone, which was generated by underplating mafic magma along with the hydrous mafic sills in the lower crust, might have resulted in partial melts from crystallized mafic sills and older crustal rocks. It can be suggested that these hybrid melts adiabatically rose to the shallow crust, ponded and crystallized there and formed the magma source of the intrusive rocks within the Hacimahmutusagi area and the other hybrid granitic rocks with crustal signatures in the CACC. Geochemical data indicate that granitoids and gabbros are collision to post-collision related sub-alkaline rocks derived from an enriched source with extensive crustal inputs

Re evaluation of the petrological features of the Ekecikdag oceanic plagiogranites in Central Anatolia Turkey

Remnants of the Izmir-Ankara-Erzincan branch of the Alpine Neotethys are represented by dismembered ophiolitic units in the Ekecikdag area (central Anatolia/Turkey). In the Ekecikdag and nearby areas, the ophiolitic rocks thrust over the central Anatolian metamorphic basement and intruded by the Late Cretaceous granitoids. Among these ophiolitic rocks plagiogranites are significant for the petrological evaluation of the oceanic history. The available data and interpretations on the Ekecikdag plagiogranites (Göncüoğlu and Türeli, 1993) are re-assessed by using the new geochemical data. The Ekecikdag plagiogranites are composed of quartz, plagioclase, hornblende, biotite ± clinopyroxene, with accessory amount of zircon, titanite and apatite minerals. They are tonalite in composition on the normative Ab–An–Or plot, but display extremely low Or %. The plagiogranites in the Ekecikdag area show high SiO2 (69.9–75.7 wt. %), but exceptionally low K2O contents (less than 0.6 wt. %), which correspond to the oceanic plagiogranite description of Coleman and Peterman (1975). Furthermore they contain Na2O contents ranging from 2.7 to 5.3 wt. %, Al2O3 contents ranging from 12.8 to 14.3 wt. %, and CaO contents ranging from 3.0 to 5.4 wt %. They are subalkaline, calcic, and have transitional characters from metaluminous to peraluminous, and from magnesian to ferroan. Furthermore, depletions in Th, Nb, La, Ce, P, Zr and Ti are noticeable on the primitive normalized spider diagrams. Chondrite-normalized REE diagram of plagiogranite samples shows LREE contents, increasing from La to Sm, and flat MREE and HREE profiles. Overall REE pattern reveals higher HREE with respect to LREE ([La/Yb]N = 0.33–0.46] and negative Eu anomalies ([Eu/Eu*]N = 0.67–0.97) suggesting plagioclase fractionation. Additionally, the plagiogranite samples plot into the VAG field within the Nb vs. Y diagram of Pearce et al. (1984), but still in the fields of plagiogranites from the Troodos and Oman ophiolites. The Ekecikdag plagiogranites likely to be derived from partial melting of the depleted mantle sources in a supra-subduction zone setting, and are comparable with other plagiogranites in the Tethyan realm