Altug Hasozbek

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• PhD
• Researcher at National Research Center on Human Evolution

The northern border of the Menderes Massif is dominated by gneiss–schist–marble association and metagranites. The high-grade units of the massif are tectonically overlain by a meta-platform sequence of the Afyon Zone and the Cretaceous-early Tertiary HP/LT Tavşanlı Zone. The Simav Magmatic Complex, comprising the shallow-seated, I-type, calc-alkali...

The Alaçam region of NW Turkey lies within the Alpine collision zone between the Sakarya continent and the Menderes platform. Four different tectonic zones of these two continents form imbricated nappe packages (including the Afyon zone), intruded by the Alaçam granite. Newly determined U-Pb zircon ages of this granite are 20.0 ± 1.4 and 20.3 ± 3.3...

The Antarctic Peninsula is uplifting rapidly due to the isostatic response to ice sheet unloading since the Holocene. Understanding the timing and rate of this process is crucial for addressing several key research questions: (1) exploring the elastic interactions between the mantle and lithosphere to improve Glacial Isostatic Adjustment (GIA) mode...

The Black Sea is currently a nearly enclosed basin connected to the Mediterranean via the Bosphorus Strait (sill depth at 35 m bsl), the Marmara Sea, and the Dardanelles (65 m bsl). During the last glacial period, this connection was severed due to global sea level drop, falling lower than the sill depths. While the early Holocene reconnection of t...

U-Th geochronology is a key tool in Quaternary geology, widely applied to carbonate matrices with significant advancements achieved through MC-ICP-MS technology. However, 230 Th dating remains challenging for samples with low-uranium concentrations and high-detrital thorium content which often reflecting open-system behavior. These factors increase...

Seferihisar (Izmir) is one of the most significant geothermal regions in the Aegean of Western Anatolia, Türkiye, due to its high geothermal gradient, extensive fault systems, and unique interaction between marine and meteoric waters that create distinct geothermal reservoirs. This study evaluates the geothermal potential and geological characteris...

In the vicinity of the ancient city of Lebedos, known as one of the twelve Ionian cities, located south of İzmir in W. Anatolia (Türkiye), the NE-SW-trending active Tuzla Fault zone is characterized by numerous hot springs and associated travertine-type carbonate deposits (sinter). Among these, the active Doğanbey bath features an approximately 560...

Seferihisar is one of the important geothermal areas in the Aegean region. Therefore, this study aims to evaluate the geothermal potential and geological features of the Seferihisar area in Türkiye by integrating marine seismic data with terrestrial geological observations. Additionally, the research highlights the significance of marine geophysics...

This work proposes a new approach for the analysis of radionuclides in NORM-type solid materials included in a European-level intercomparison test (Environmental Radiation Monitoring, REM2020), provided by the Environmental Radiation Monitoring group of the Joint Research Centre (JRC). The measurement techniques employed are inductively coupled pla...

In Quaternary geochronology, accurately estimating natural radiation exposure is crucial for dating materials using Electron Spin Resonance (ESR) and Optically Stimulated Luminescence (OSL). Traditional methods like gamma and alpha spectrometry, despite their utility, are limited by sample size requirements and time inefficiency, especially in low-...

Recent advancements in MC-ICPMS technology have significantly enhanced the application of U/Th geochronometry in both biogenic and chemically precipitated carbonate rocks of almost middle Pleistocene to upper Holocene. This burgeoning use, particularly in the study of late Pleistocene earth surface processes, underscores the need for standardized r...

Abstract The revision of the fauna of Carigüela (Píñar, Granada) has yielded the remains of a cave lion hitherto unknown at this site. The comparative morphometric study of the distal humerus fragment has led to its attribution to Panthera spelaea Goldfuss. From two samples of the bone and using the U/Th technique, an absolute dating of 145–148 ka...

The Tozlu metaophiolite is composed predominantly of metagabbro, banded amphibolite, metadunite, and serpentinite, which are exposed in the Kazdağ Massif located in the northwestern part of Turkey. The geochemistry (major, trace, and rare earth elements) and petrography of the Tozlu metaophiolite in the Kazdağ Massif provided significant knowledge...

Speleothems are a valuable source of paleo-records due to their inorganic elementcontent and profile. The elemental variations in speleothems can be a supplementaryinput to interpret the related climate proxies. Element ratios such as Ba/Ca and Mg/Caare often used as indicators of climate conditions over time. This study presents arecord of 12 sele...

A new potential speleothem standard (BSS2) for MC ICP MS analysis.

In this paper, a statistical uranium isotope dilution mass spectrometry approach is presented to simulate the wide range of spike-sample mixed ratios of ²³⁵ U/ ²³⁸ U, in terms of their related expanded uncertainties and uncertainty budget indexes. To obtain the lowest expanded uncertainty in uranium isotope dilution mass spectrometry (U-IDMS) techn...

The estimation of groundwater recharge is an essential process for hydrogeological study. Realistic determination approach is crucial for assessing groundwater potential in an aquifer system and estimating of groundwater levels and/or changes in dry periods. Based on these matters, we employ a GIS-integrated groundwater level fluctuation method to...

The bimodal, high-K calk-alkaline to weakly alkaline Miocene volcanic association crops out widely around İzmir in western Anatolia. From Aliağa, in the north, to Cumaovası, in the south, basaltic to rhyolitic lavas and pyroclastic rocks interdigitate with the Miocene fluvial to lacustrine sedimentary succession. This volcano-sedimentary complex un...

In the eastern Mediterranean, the Lycian Nappes are found in the structurally uppermost position in the Anatolide-Tauride belt related to the closure of the Neotethys. In Western Turkey, the Marmaris Ophiolite with the metamorphic sole occupies the uppermost tectonic position in the Lycian belt. The metamorphic sole is represented by discontinuous...

Özet: Kuzeybatı Anadolu’da yüksek dereceli metamorfizmasının ürünleri, Biga Yarımadası’nda detaylı olarak tanımlanır. Kazdağı Masifi, Biga Yarımadası’nın güneyinde yer alır ve yüksek sıcaklık metamorfizmasının izleri hem temelindeki metaofiyolitik birliklerde (Tozlu Metaofiyoliti) hem de temelin üzerine uyumsuzluk ile gelen metaplatform istifinde (...

The high-grade succession of the Kazdagı massif is one of the well-known in the northwestern Turkey (Biga ˘ Peninsula). The Kazdagı massif is characterized by, from bottom to top, oceanic-crustal ultramafic rocks, and ˘ unconformably overlain by the thick-platform type associations (marble and migmatite) with amphibolites and metagranitoids. These...

The Biga Peninsula comprises one of the unique geological regions, in where old oceanic sutures (Neotethys, Karakaya, Paleotethys sutures) and different sources of rocks gathered. Significant traces of these rocks with different origins and characteristics are reported in different rock associations of the Kazdag Massif occurring in the southern pa...

Widespread outcrops of the Early-Middle Miocene volcanism can be found in the western Anatolia. Different facies of this volcanism are particularly common along the northern and the southern parts of the Izmir-Ankara Zone. In this paper, major, trace and isotope compositions (Sr-Nd) of the Early-Middle Miocene Dursunbey (Balikesir), and Foça (Izmir...

Lime based plaster and mortar specimens from three different locations of Smyrna Agora excavations have been investigated within the scope of this study. A two-layer graffito plaster from Basilica (P1 inner layer, P2 outer layer) and two distinctive mortars from Bouleuterion were collected from the site. While one of the Bouleuterion mortars was ma...

The isotope ratio measurement techniques - total evaporation (TE), modified total evaporation (MTE), and Conventional - used for characterization measurements of certified reference materials (CRMs) by thermal ionization mass spectrometer (TIMS) instruments are compared. The advantages of each method, the fractionation profiles resulting from the m...

Certified Reference Material (CRM) 116-A is a uranium amount content (assay) and isotope amount ratio (isotopic composition) standard for nuclear material safeguards/non-proliferation analyses. CRM 116-A was specifically created as a replacement for the CRM 116 U metal standard. Each unit is comprised of a 1.1-g metal pellet of 93% 235U enriched ur...

During and after the closure of the Neo-Tethyan Ocean and progressive collision of the Tauride-Anatolide Platform with the Sakarya Continent, widespread magmatism occurred in NW Anatolia. This magmatism is manifested in a NW-trending belt along the northern border of the Menderes Massif. Due to the complex geodynamic setting of this region, the exa...

Total evaporation (TE) is an analysis technique for the measurement of uranium isotopic abundance ratios using thermal ionization mass spectrometry (TIMS). A small mass dependent bias observed in this analytical technique is determined by an external correction factor using well characterized standards (most often certified reference materials, CRM...

The total evaporation (TE) is a well-established analytical method for safeguards measurement of uranium and plutonium isotope-amount ratios using the thermal ionization mass spectrometry (TIMS). High accuracy and precision isotopic measurements find many applications in nuclear safeguards, for e.g. assay measurements using isotope dilution mass sp...

Zircon (ZrSiO4) is a mineral of singular importance in the geosciences. Zircon microanalysis has greatly contributed to our understanding of key events in earth's history as certain radioactive heavy elements and their daughter products are well-preserved within the exceptionally stable inorganic matrix of the mineral. A prevailing notion in this f...

The total evaporation (TE) method is an established analytical method for safeguards measurements of uranium and plutonium isotope-amount ratios using thermal ionization mass spectrometry. As fractionation effects are minimized in this analytical method, it is a method of choice in many practical applications that require high accuracy and precisio...

Certified reference material (CRM) 115, Uranium (Depleted) Metal (Uranium Assay Standard), was analyzed using a TRITON Thermal Ionization Mass Spectrometer to characterize the uranium isotope-amount ratios. The certified 235U/238U “major” isotope-amount ratio of 0.0020337 (12) in CRM 115 was determined using the total evaporation (TE) and the modif...

The isotope dilution mass spectrometry method of analysis is used to determine the elemental uranium contents in a wide variety of uranium bearing materials. The method is based on the mass spectrometric analysis of a mixture prepared by diluting the sample to be analyzed with a spike of distinctly different isotopic composition to that of the samp...

Radiometric isotope applications in geosciences have been enormously improving during the last decade. Most of these applications were also performed in the entire Turkey by various researchers. From southern to northern part of the Menderes Massif (western Anatolia), 40Ar-39Ar mica; Rb-Sr whole rock, mica; K-Ar whole rock, mica; U-Pb zircon isotop...

Proven measurement techniques play a critical role in the preparation of Certified Reference Materials (CRMs) - those requiring high accuracy and precision in the measurement results. Isotope Dilution Mass Spectrometry (IDMS) is one such measurement method commonly used in the quantitative analysis of uranium in nuclear safeguards and isotope geolo...

The isotope dilution mass spectrometry method of analysis is used to determine the elemental uranium contents in a wide variety of uranium bearing materials. The method is based on the mass spectrometric analysis of a mixture prepared by diluting the sample to be analyzed with a spike of distinctly different isotopic composition to that of the samp...

During and aft er the closure of the Neo-Tethyan Ocean and progressive collision of the Tauride-Anatolide Platform with the Sakarya Continent, widespread magmatism occurred in NW Anatolia. Th is magmatism is manifested in a NW-trending belt along the northern border of the Menderes Massif. Due to the complex geodynamic setting of this region, the e...

During the Alpine orogeny, the northern margin of the Tauride-Anatolide Block was deeply buried below the Sakarya continent and subjected to high pressure/low temperature metamorphism. Along this suture zone Tavşanli Zone, Afyon Zone, Bornova Flysch Zone and opholitic mélange nappes form the different tectono-stratigraphic units. The Afyon Zone, in...

Central Aegean magmatic belt including the northwestern Anatolia is interpreted in the literature as formed along magmatic arc which has migrated southwardly to its present position. During and after the closure of the Neo-Tethyan Ocean and progressive collision of the Tauride-Anatolide Platform with the Sakarya Continent, widespread magmatism occu...

Keywords: High-K granite Sr–Nd isotopy Ar–Ar dating U–Pb zircon dating Variscan orogeny Eastern Pontides Turkey The Gümüşhane pluton, a high-K calc-alkaline I-type granodiorite/granite complex, forms an important component of the pre-Liassic basement of the Eastern Pontides (NE Turkey). In its eastern part, the pluton shows a compositional zonation...

In the northwestern part of Anatolia along the Izmir-Ankara Suture Zone, the Kazdag and Uludag metamorphic massifs form an E-W trending belt between the Sakarya Continent in the north and the Menderes Massif in the south. Internal succession of these two massifs have been described as metamorphic complexes consisting of various kinds of micaschists...

The northern part of the Anatolide-Tauride platform developed at a site of pronounced E-W trending felsic magmatic activity during the late Oligocene-Miocene. These widespread magmatic rocks intruded into the Anatolide-Tauride Block in the south, the Sakarya Continent in the north, and different slices of this collision zone. New geochronological a...

In this research, geological and hydrogeological studies were conducted to determine the source of high arsenic levels in the surficial aquifer of Simav Plain, Kutahya, Turkey. One of the two aquifer systems isolated in the study area was a deep confined aquifer composed of fractured metamorphic rocks that supply hot geothermal fluid. The other one...