Browsing by Author "Karslı, Orhan"
Now showing items 1-20 of 32
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Adakite-like parental melt generation by partial fusion of juvenile lower crust, Sakarya Zone, NE Turkey: A far-field response to break-off of the southern Neotethyan oceanic lithosphere
Karslı, Orhan; Dokuz, Abdurrahman; Kandemir, Raif; Aydın, Faruk; Schmitt, Axel K.; Ersoy, E. Yalçın; Alyıldız, Cihangir (Elsevier Science Bv, 2019)The timing of major tectonic events and the driving mechanisms for magma generation during Late Cenozoic convergence and collision between Arabia and Eurasia still remain unknown. the Sakarya Zone (SZ) in northern Turkey ... -
Cenozoic temporal variation of crustal thickness in the Urumieh-Dokhtar and Alborz magmatic belts, Iran
Sepidbar, Fatemeh; Karslı, Orhan; Palin, Richard M.; Casetta, Federico (Elsevier, 2021)We present regional variations of whole-rock Sr/Y and (La/Yb)(N) ratios of magmatic rocks along the Cenozoic Urumieh-Dokhtar and Alborz magmatic belts, Iran. Both the magmatic belts are located at the north of the main ... -
Crustal evolution of NW Iran: Cadomian arcs, archean fragments and the cenozoic magmatic flare-up
Moghadam, Hadi Shafaii; Griffin, William L.; Li, Xian-Hua; Santos, Jose F.; Karslı, Orhan; Stern, Robert J.; Ghorbani, Ghasem; Gain, Sarah; Murphy, Rosanna; O'Reilly, Suzanne Y. (Oxford Univ Press, 2017)The Cadomian orogen of NW Iran includes a series of metamorphic rocks with zircon U-Pb ages between ca 562 and 505 Ma (Ediacaran to middle Cambrian). the Ediacaran-Cambrian basement is intruded by a series of Late Eocene-Late ... -
Deciphering the shoshonitic monzonites with I-type characteristic, the Sisdaĝi pluton, NE Turkey: Magmatic response to continental lithospheric thinning
Karslı, Orhan; Dokuz, Abdurrahman; Uysal, İbrahim; Ketenci, Murat; Chen, Bin; Kandemir, Raif (Elsevier, 2012)Large-scale late Mesozoic to early Cenozoic plutons in the Eastern Pontide orogenic belt mostly show calc-alkaline and I-type geochemical features. However, we identify the Sisda?i pluton that has shoshonitic affinity and ... -
Early Cambrian S-type granites in the Sakarya Zone, NE Turkey: A record for transition from subduction to post-collisional extension deduced from U-Pb zircon age and Nd-Hf isotopes
Karslı, Orhan; Şengün, Fırat; Dokuz, Abdurrahman; Aydın, Faruk; Kandemir, Raif; Kristoffersen, Magnus; Santos, Jose Francisco; Hofmann, Mandy; Duygu, Levent (Elsevier, 2022)Cadomian realms have recently received much attention in the Alpine-Mediterranean orogenic belts, with discontinuous outcrops extending from the Alps to the Istanbul Zone, Menderes Massif, Taurides in Turkey and Iran as ... -
Early Cambrian S-type granites in the Sakarya Zone, NE Turkey: A record for transition from subduction to post-collisional extension deduced from U[sbnd]Pb zircon age and Nd[sbnd]Hf isotopes
Karslı, Orhan; Şengün, Fırat; Dokuz, Abdurrahman; Aydın, Faruk; Kandemir, Raif; Kristoffersen, Magnus; Santos, José Francisco; Hofmann, Mandy; Duygu, Levent (Elsevier, 2022)Cadomian realms have recently received much attention in the Alpine–Mediterranean orogenic belts, with discontinuous outcrops extending from the Alps to the İstanbul Zone, Menderes Massif, Taurides in Turkey and Iran as ... -
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, 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 ... -
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 ... -
Large Fe-Mn oncoids from Early Jurassic Ammonitico Rosso Facies (eastern Sakarya Zone, NE Turkey): new insight into palaeogeographic conditions of Tethys Ocean
Kandemir, Raif; Özyurt, Merve; Demir, Yılmaz; Karslı, Orhan (Taylor & Francis Ltd., 2024)Oncoids, significant sedimentary structures within the Jurassic strata of the Mediterranean Region,serve as valuable indicators of paleoenvironmental conditions during their formation. One of theimportant examples of oncoids ... -
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 ... -
Nature of the Early Cretaceous lamprophyre and high-Nb basaltic dykes, NE Turkey: Constraints on their linkage to subduction initiation of Neotethyan oceanic lithosphere
Karslı, Orhan; İlhan, Mehdi; Kandemir, Raif; Dokuz, Abdurrahman; Aydın, Faruk; Uysal, İbrahim; Duygu, Levent (Elsevier B.V., 2021)Late Mesozoic evolution of the Neotethys Ocean is critical and still remains unclear along the entire Sakarya Zone (SZ), Turkey, because previous interpretations of the Middle to Late Jurassic rifting of the SZ have not ... -
The Paleogene ophiolite conundrum of the Iran-Iraq border region
Moghadam, Hadi Shafaii; Li, Qiu-Li; Stern, Robert J.; Chiaradia, Massimo; Karslı, Orhan; Rahimzadeh, Bahman (Geological Soc Publ House, 2020)New and compiled geochemical, isotopic and geochronological data allow us to propose a new explanation for Paleogene oceanic magmatic rocks along the Iran-Iraq border. These rocks are represented by a thick pile (>1000 m) ... -
Petrogenesis and U-Pb zircon geochronology of migmatitzation during Neo-Tethyan Jurassic magmatic arc extension: The Boroujerd example, western Iran
Zare-Shooli, Masoumeh; Tahmasbi, Zahra; Ao, Songjian; Zhang, Hua-Feng; Ahmadi-Khalaji, Ahmad; Yakymchuk, Chris; Esmaeili, Rasoul; Karslı, Orhan (Elsevier, 2021)The migmatites in the Boroujerd region, Western Iran are spatially associated with felsic and mafic magmatism. However, the genetic relationship between partial melting and magmatism in the region is unclear. Four metapelite ... -
Petrogenesis of ultramafic rocks from the eastern Orhaneli ophiolite, NW Turkey: Hints on the initiation and evolution of melt-peridotite interaction processes within a heterogeneously depleted mantle section
Uysal, İbrahim; Dokuz, Abdurrahman; Kapsiotis, Argyrios; Saka, Samet; Karslı, Orhan; Kaliwoda, Melanie; Mueller, Dirk (Pergamon-Elsevier Science Ltd, 2017)The eastern Orhaneli ophiolite in NW Anatolia (Turkey) consists of voluminous dunite and minor harzburgite intruded by clinopyroxenite veins. Harzburgite contains spinel of low Cr# [100 x Cr/(Cr + Al) = 40-45] and diopside ...
