Yazar "RTEÜ, Mühendislik ve Mimarlık Fakültesi, Jeoloji Mühendisliği Bölümü" için Mühendislik Fakültesi listeleme
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Geochemical fingerprints of Late Triassic calc-alkaline lamprophyres from the Eastern Pontides, NE Turkey: A key to understanding lamprophyre formation in a subduction-related environment
Karslı, Orhan; Dokuz, Abdurrahman; Kaliwoda, Melanie; Uysal, İbrahim; Aydın, Faruk; Kandemir, Raif; Fehr, Karl-Thomas (Elsevier Science Bv, 2014)The Eastern Pontides in NE Turkey is one of the major orogenic belts in Anatolia. in this paper, we report our new Ar-40/Ar-39 dating, mineral chemistry, major and trace elements and Sr-Nd-Pb isotopic analyses of the ... -
Geochemical make-up of oceanic peridotites from NW Turkey and the multi-stage melting history of the Tethyan upper mantle
Uysal, İbrahim; Şen, A. Dündar; Ersoy, E. Yalçın; Dilek, Yıldırm; Saka, Samet; Zaccarini, Federica; Escayola, Monica; Karslı, Orhan (Springer Wien, 2014)We present the whole-rock and the mineral chemical data for upper mantle peridotites from the Harmancik region in NW Turkey and discuss their petrogenetic-tectonic origin. These peridotites are part of a Tethyan ophiolite ... -
Geochemical modelling of early Eocene adakitic magmatism in the Eastern Pontides, NE Anatolia: continental crust or subducted oceanic slab origin?
Karslı, Orhan; Uysal, İbrahim; Dilek, Yıldırım; Aydın, Faruk; Kandemir, Raif (Taylor & Francis Inc, 2013)Early Eocene adakitic volcanic and granitoid rocks are widespread in the Eastern Pontides of NE Turkey, providing significant constraints for the early Cenozoic tectonomagmatic evolution of the region. These adakitic rock ... -
Geochemistry of the Lake Sediments on Robert Island, South Shetland Islands, Antarctica: implications for weathering processes in Polar areas
Özyurt, Merve; Demir, Yılmaz; Özkan, Korhan; Kandemir, Raif (TUBİTAK Scientific & Technical Research Council Turkey, 2023)The preliminary results of geochemical analyses of the surface sediments from 4 lakes on Robert Island, South Shetland, Antarctica, are presented herein. The samples were collected during the Turkish Antarctic Expedition ... -
Geochemistry of the massive dolomites in Eastern Black Sea region: REE implications for dolomite petrogenesis
Özyurt, Merve; Kırmacı, M. Ziya; Al-Aasm, Ihsan S.; Kandemir, Raif (Springer Link, 2023)Dolomitization is an important diagenetic process observed in carbonate rocks ranging in age from Precambrian to Holocene. The formation of massive dolostone bodies has long been a challenge due to complex sedimentary and ... -
Geochemistry of the Turonian-Coniacian strata: New insight into paleoenvironmental conditions of the Tethys, Eastern Pontides, NE Turkiye
Özyurt, Merve; Kanat, Ayhan; Yıldızoğlu, Selim (Elsevier, 2023)The eastern part of the Sakarya Zone, known as the Eastern Pontides, is represented by a south-facing carbonate platform during the Late Jurassic-Early Cretaceous. The shallow marine carbonate sedimentation is masked by ... -
Geochemistry, fluid inclusion and stable isotope constraints (C and O) of the Sivrikaya Fe-skarn mineralization (Rize, NE Turkey)
Demir, Yılmaz; Uysal, İbrahim; Kandemir, Raif; Jauss, Andrea (Elsevier Science Bv, 2017)The Sivrikaya Fe-skarn mineralization is hosted by dolomitic limestone layers of Late Cretaceous volcano-sedimentary unit, comprised of andesite, basalt and their pyroclastites, including, sandstone, shale and dolomitic ... -
Geochemistry, Re-Os isotopes and highly siderophile element abundances in the Eastern Pontide peridotites (NE Turkey): Multiple episodes of melt extraction-depletion, melt-rock interaction and fertilization of the Rheic Ocean mantle
Dokuz, Abdurrahman; Uysal,İbrahim; Dilek, Yıldırım; Karslı, Orhan; Meisel, Thomas; Kandemir, Raif (Elsevier, 2015)We report on the structure, geochemistry, Re-Os isotopes and relative abundances of highly siderophile elements (HSEs) of the Paleozoic peridotite-basalt occurrences in the Eastern Pontide belt of northeastern Turkey. These ... -
Geological, mineralogical and geochemical properties of the Dagbast skarn ores (Arakh-Trabzon, NE Turkey)
Demir, Yılmaz (Maden Tetkik ve Arama Genel Mudurlugu-Mta, 2019)The Dagbasi skarns have developed as an exoskarn type along the nearest border of Upper Cretaceous Dagbasi Granitoid and block- and lens-shaped limestones of Berdiga formation located in the Liassic volcanics. the early ... -
Geology and genesis of the Silica-Listwaenite hosted Kaymaz gold deposit, Eskişehir, NW-Turkey: Implications from fluid inclusions and pyrite chemistry
Yavuz, Hikmet; Demir, Yılmaz; Kasapçı, Cem; Uysal, İbrahim; Helvacı, Cahit (Elsevier, 2022)The Kaymaz gold deposit comprises Damdamca, Karakaya, Küçük Mermerlik, and Kızılağıl ore zones within an area underlain by serpentinite and far-traveled Paleozoic-Mesozoic high-pressure metamorphic rocks. The Kızılağıl ore ... -
An investigation for potential extensions of the Karaca Cavern using geophysical methods
Seren, Aysel; Babacan, Ali Erden; Gelişli, Kenan; Ögretmen, Zeynep; Kandemir, Raif (Springer, 2012)It is extremely important for regional tourism to determine the possible extensions of Karaca Cavern, one of the most important tourism destinations of the GumuAYhane province in Northeast Turkey. Cavities in karstic areas ... -
Investigation of the relationship among fault types, focal depths, and Ionospheric TEC anomalies before large earthquakes between 2000 and 2020
Ulukavak, Mustafa; Yalçınkaya, Mualla; Kayıkçı, Emine Tanır; Öztürk, Serkan; Kandemir, Raif; Karslı, Hakan (ASCE- American Society of Civil Engineers, 2022)In this study, the relationships between possible ionospheric total electron content (TEC) anomalies and earthquake focal depths and fault types were investigated using 3,099 global earthquakes with Mw >= 6.0 between 2000 ... -
A Jurassic volcanic passive margin in Iran and Turkey
Azizi, Hossein; Stern, Robert J.; Kandemir, Raif; Karslı, Orhan (Wiley, 2022)Broadly similar Early to Middle Jurassic stratigraphic sequences including bimodal igneous rocks of the Sanandaj–Sirjan Zone of Iran and the Sakarya Zone of Turkey suggest that these formed in a common tectonic setting in ... -
Late Jurassic Magmatism and Stratigraphy in the Eastern Sakarya Zone, Turkey: Evidence for the Slab Breakoff of Paleotethyan Oceanic Lithosphere
Dokuz, Abdurrahman; Aydınçakır, Emre; Kandemir, Raif; Karslı, Orhan; Siebel, Wolfgang; Derman, Ahmet Sami; Turan, Mehmet (Univ Chicago Press, 2017)Middle-Late Jurassic Cimmerian events in Turkey have been actively discussed in the past three decades, but proposed tectonic models associated with magmatism, metamorphism, and stratigraphic features remain controversial. ... -
Late Jurassic Paleotethyan oceanic slab break-off revealed by Sr-Nd-Hf isotopes of Na-rich adakitic granites from northwestern Turkey
Karslı, Orhan; Şengün, Fırat; Santos, Jose Francisco; Uysal, İbrahim; Dokuz, Abdurrahman; Aydın, Faruk; Kandemir, Raif (Elsevier, 2021)The Mesozoic geodynamic evolution of the Paleotethys Ocean is critical but a poorly known piece of the geological history of the Sakarya Zone, north Turkey. Here, we describe new integrated research of zircon U-Pb ... -
Latest Cretaceous "A(2)-type" granites in the Sakarya Zone, NE Turkey: Partial melting of mafic lower crust in response to roll-back of Neo-Tethyan oceanic lithosphere
Karslı, Orhan; Aydın, Faruk; Uysal, İbrahim; Dokuz, Abdurrahman; Kumral, Mustafa; Kandemir, Raif; Ketenci, Murat (Elsevier Science Bv, 2018)An integrated study of comprehensive geochronological, geochemical, and Sr-Nd-Hf isotopic data was undertaken for the A-type Topcam pluton that intruded within the Sakarya Zone (NE Turkey) with the aims of elucidating its ... -
Melting of the juvenile lower crust in a far-field response to roll-back of the southern Neotethyan oceanic lithosphere: the Oligocene adakitic dacites, NE Turkey
Karslı, Orhan; Caran, Şemsettin; Çoban, Hakan; Şengün, Fırat; Tekkanat, Osman; Andersen, Tom (Elsevier, 2020)Late Cenozoic tectono-thermal events and associated magmatism in the Sakarya Zone (SZ) are still contested. Although documented in the western part of the SZ, thus far, no magmatic activity has been identified in the eastern ... -
Mineral chemical investigation on sulfide mineralization of the Istala deposit, Gumushane, NE-Turkey
Demir, Yılmaz; Uysal, İbrahim; Sadıklar, Münür Burhan (Elsevier Science Bv, 2013)The mineralogy of the Istala deposit, Gumushane, northeastern Turkey, was studied in detail, and a geochemical investigation was carried out using electron probe micro-analysis (EPMA). Sphalerite, galena, chalcopyrite and ... -
Mineralogy, mineral chemistry, fluid inclusion, and stable isotope investigations of the Kabaduz ore veins, Ordu, NE-Turkey
Demir, Yılmaz; Uysal, İbrahim; Sadıklar, M. Burhan; Ceriani, Andrea; Hanilçi, Nurullah; Mueller, Dirk (Elsevier, 2015)Hydrothermal vein-type deposits of the Kabaduz region (Ordu, NE-Turkey) are located in Upper Cretaceous andesitic-basaltic rocks and were formed in fault zones along NW-SE direction lines, with thicknesses varying between ... -
The multidisciplinary approaches on facies developments and depositional systems of the Bahcecik travertines, Gumushane, NE-Turkey
Kandemir, Raif; Tagliasacchi, Ezher; Kayseri Özer, Mine Sezgül; Şaffak, Dilek; Koroğlu, Fatih; Hu, Hsun-Ming; Shen, Chuan-Chou (Scientific Technical Research Council Turkey, TÜBİTAK, 2021)The Bahcecik travertines, located in Gumushane (NE-Turkey) have been investigated for the first time using a multidisciplinary approach, which included sedimentological (lithofacies, depositional system), petrographic, ...