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Gürol Seyitoğlu - One of the best experts on this subject based on the ideXlab platform.
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the 40ar 39ar age of extensional ductile deformation and Granitoid intrusion in the northern menderes core complex implications for the initiation of extensional tectonics in western turkey
Journal of Asian Earth Sciences, 2004Co-Authors: Veysel Işik, Okan Tekeli, Gürol SeyitoğluAbstract:The Simav detachment fault in the northern part of Menderes Core Complex in western Turkey, separates cover sequence rocks with brittle deformation, from high-grade metamorphic (core) rocks and young Granitoid intrusions. The timing of shear zone formation and the intrusion of syn-tectonic Granitoids is constrained by 40Ar/39Ar geochronology on muscovite from mylonitic gneiss, and biotite from the Egrigoz Granitoid. 40Ar/39Ar data indicate that mylonitic deformation occurred at 22.86±0.47 Ma, whilst the cooling age of the Granitoid is 20.19±0.28 Ma. The intrusion and cooling of the Egrigoz Granitoid occurred between ∼23–20 Ma. These data demonstrate that extensional deformation in the northern Menderes Core Complex began before Early Miocene times and represents an early stage in the Tertiary extensional tectonics of western Turkey.
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The 40Ar/39Ar age of extensional ductile deformation and Granitoid intrusion in the northern Menderes core complex: implications for the initiation of extensional tectonics in western Turkey
Journal of Asian Earth Sciences, 2004Co-Authors: Veysel Işik, Okan Tekeli, Gürol SeyitoğluAbstract:The Simav detachment fault in the northern part of Menderes Core Complex in western Turkey, separates cover sequence rocks with brittle deformation, from high-grade metamorphic (core) rocks and young Granitoid intrusions. The timing of shear zone formation and the intrusion of syn-tectonic Granitoids is constrained by 40Ar/39Ar geochronology on muscovite from mylonitic gneiss, and biotite from the Egrigoz Granitoid. 40Ar/39Ar data indicate that mylonitic deformation occurred at 22.86±0.47 Ma, whilst the cooling age of the Granitoid is 20.19±0.28 Ma. The intrusion and cooling of the Egrigoz Granitoid occurred between ∼23–20 Ma. These data demonstrate that extensional deformation in the northern Menderes Core Complex began before Early Miocene times and represents an early stage in the Tertiary extensional tectonics of western Turkey.
Veysel Işik - One of the best experts on this subject based on the ideXlab platform.
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the 40ar 39ar age of extensional ductile deformation and Granitoid intrusion in the northern menderes core complex implications for the initiation of extensional tectonics in western turkey
Journal of Asian Earth Sciences, 2004Co-Authors: Veysel Işik, Okan Tekeli, Gürol SeyitoğluAbstract:The Simav detachment fault in the northern part of Menderes Core Complex in western Turkey, separates cover sequence rocks with brittle deformation, from high-grade metamorphic (core) rocks and young Granitoid intrusions. The timing of shear zone formation and the intrusion of syn-tectonic Granitoids is constrained by 40Ar/39Ar geochronology on muscovite from mylonitic gneiss, and biotite from the Egrigoz Granitoid. 40Ar/39Ar data indicate that mylonitic deformation occurred at 22.86±0.47 Ma, whilst the cooling age of the Granitoid is 20.19±0.28 Ma. The intrusion and cooling of the Egrigoz Granitoid occurred between ∼23–20 Ma. These data demonstrate that extensional deformation in the northern Menderes Core Complex began before Early Miocene times and represents an early stage in the Tertiary extensional tectonics of western Turkey.
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The 40Ar/39Ar age of extensional ductile deformation and Granitoid intrusion in the northern Menderes core complex: implications for the initiation of extensional tectonics in western Turkey
Journal of Asian Earth Sciences, 2004Co-Authors: Veysel Işik, Okan Tekeli, Gürol SeyitoğluAbstract:The Simav detachment fault in the northern part of Menderes Core Complex in western Turkey, separates cover sequence rocks with brittle deformation, from high-grade metamorphic (core) rocks and young Granitoid intrusions. The timing of shear zone formation and the intrusion of syn-tectonic Granitoids is constrained by 40Ar/39Ar geochronology on muscovite from mylonitic gneiss, and biotite from the Egrigoz Granitoid. 40Ar/39Ar data indicate that mylonitic deformation occurred at 22.86±0.47 Ma, whilst the cooling age of the Granitoid is 20.19±0.28 Ma. The intrusion and cooling of the Egrigoz Granitoid occurred between ∼23–20 Ma. These data demonstrate that extensional deformation in the northern Menderes Core Complex began before Early Miocene times and represents an early stage in the Tertiary extensional tectonics of western Turkey.
Ying Tong - One of the best experts on this subject based on the ideXlab platform.
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Some progress on understanding the Phanerozoic Granitoids in China
China Geology, 2018Co-Authors: Tao Wang, Ying Tong, Xiaoxia Wang, Jian-ren Mao, Hong-rui Zhang, He Huang, Lei Guo, Jian-jun ZhangAbstract:ABSTRACT There are large volumes of the Phanerozoic Granitoid rocks in China and neighboring areas. In recent years, numerous new and precise U-Pb zircon ages have been published for these Granitoids, and define many important magmatic events, such as ca. 500 Ma Granitoid events in the West Junggar, Altai orogens in the NW China, and Qinling orogen in the central China. These ages accurately constrain the time of important Early Paleozoic, Late Paleozoic, Early Mesozoic and Late Mesozoic magmatic events of the northern, central, western, southern and eastern orogenic Mountains in China. There occur various types of Granitoids in China, such as calc-alkaline granite, alkali granite, highly-fractionated granite, leucogranite, adakite, and rapakivi granite. Rapakivi granites are not only typical Proterozoic as in the North China Craton, but were also emplaced during Paleozoic and Mesozoic in the Kunlun-Qinling orogen, a part of the China Central Orogenic Belt (CCOB). Nd-Hf isotopic tracing and mapping show that Granitoids in the southern Central Asian Orogenic Belt (CAOB) in China (or the Northern China Orogenic Belt) are characterized predominantly by juvenile sources. The juvenile crust in this orogenic domain accounts for over 50% by area, distinguishing it from other orogenic belts in the world, and those in central (e.g., Qinling), southwestern and eastern China. Based on a large amount of new age data, a preliminary Granitoid and Granitoid-tectonic maps of China have been preliminarily compiled, and an evolutionary framework of Phanerozoic Granitoids in China and neighboring areas has been established from the view of assembly and breakup of continental blocks. Research ideas on Granitoid tectonics has also been proposed and discussed.
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evolution source and tectonic significance of early mesozoic Granitoid magmatism in the central asian orogenic belt central segment
Earth-Science Reviews, 2013Co-Authors: Tao Wang, Simon A Wilde, Ying TongAbstract:Abstract Numerous Early Mesozoic Granitoids have been recognized from the central segment of the Central Asian Orogenic Belt (CAOB). They can be broadly classified into two groups according to zircon U–Pb ages: an early-stage group covering the time span from Early to Middle Triassic (250–230 Ma) and a late-stage group emplaced during Late Triassic to Early Jurassic (ca. 230–190 Ma). Early-stage (250–230 Ma) Granitoids are mainly distributed in the western Central Mongolia–Erguna Belt (CMEB), the western Altai Belt (AB), the South Mongolia–Xing'an Belt (SMXB) and the Beishan–Inner Mongolia–Jilin Belt (BIJB). They consist mainly of quartz-diorites, granodiorites and monzogranites, mostly of I-type, with minor mafic intrusions, with some of them showing adakite-like signatures and some with S-type features. Late-stage (230–190 Ma) Granitoids mainly occur in the North Mongolia–Transbaikalia Belt (NMTB), the eastern CMEB (Erguna massif) and the eastern Altai Belt (AB). They are predominately syenogranites, monzogranites and syenites, associated with many alkaline granites and mafic intrusions and are A-type and transitional I–A type or highly fractionated I-type granites. Whole-rock Sr–Nd and zircon Hf isotopic data have been compiled for regional isotopic mapping. The eNd(t) values show large variations from − 7.0 to + 7.4 and Nd model ages (TDM) from 0.46 Ga to 1.43 Ga as well as the initial Sr isotopic ratios (Sri) from 0.7023 to 0.7174. The zircon eHf(t) values vary from − 4.6 to + 15.3 and give two-stage Hf model ages (TDM2) from 0.30 Ga to 2.09 Ga. The extremely large variations of whole-rock Sr–Nd and zircon Hf isotopes demonstrate strong isotopic heterogeneity of the source regions that are mainly dominated by juvenile components with significant old crustal participation. Furthermore, the late-stage Granitoids in the NMTB, the CMEB and the AB generally have more negative eNd(t) values and more variable zircon eHf(t) values than those of the early-stage Granitoids in the same belt, implying an increasing crustal signature from early- to late-stage in the assumed heterogeneous source regions within the same belt, which probably results from melting of shallower crust in parallel with a shift to more alkaline chemistry of the late Granitoid magmas. By contrast, most late-stage Granitoids in the SMXB and the BIJB have more positive eNd(t) values and homogeneous zircon eHf(t) values than those of the early-stage Granitoids in the same belt, indicating more juvenile contribution to the source of the these Granitoids. The generation of the Early Mesozoic Granitoid magmas in the NMTB and the CMEB was dominated by the ongoing closure of the Mongol–Okhotsk Ocean and some was probably related to a mantle plume process. They were possibly derived from subducted materials melting or juvenile components with some probable contributions from ancient continental crust. Early Mesozoic Granitoid magmas in the SMXB, the AB and the BIJB were generated in a post-/non-orogenic setting after the closure of the Paleo-Asian Ocean and were the results of partial melting of crustal components in response to underplating of mantle-derived magmas, most likely linked to lithospheric thickening and delamination and asthenospheric upwelling. Early Mesozoic Granitoid magmatism provides critical information on Mesozoic post-accretionary tectonic evolution of the Paleo-Asian Ocean and transitional tectonic regimes from Early Mesozoic subduction to Late Mesozoic closure of the Mongol–Okhotsk Ocean as well as post-accretionary continental growth.
Okan Tekeli - One of the best experts on this subject based on the ideXlab platform.
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the 40ar 39ar age of extensional ductile deformation and Granitoid intrusion in the northern menderes core complex implications for the initiation of extensional tectonics in western turkey
Journal of Asian Earth Sciences, 2004Co-Authors: Veysel Işik, Okan Tekeli, Gürol SeyitoğluAbstract:The Simav detachment fault in the northern part of Menderes Core Complex in western Turkey, separates cover sequence rocks with brittle deformation, from high-grade metamorphic (core) rocks and young Granitoid intrusions. The timing of shear zone formation and the intrusion of syn-tectonic Granitoids is constrained by 40Ar/39Ar geochronology on muscovite from mylonitic gneiss, and biotite from the Egrigoz Granitoid. 40Ar/39Ar data indicate that mylonitic deformation occurred at 22.86±0.47 Ma, whilst the cooling age of the Granitoid is 20.19±0.28 Ma. The intrusion and cooling of the Egrigoz Granitoid occurred between ∼23–20 Ma. These data demonstrate that extensional deformation in the northern Menderes Core Complex began before Early Miocene times and represents an early stage in the Tertiary extensional tectonics of western Turkey.
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The 40Ar/39Ar age of extensional ductile deformation and Granitoid intrusion in the northern Menderes core complex: implications for the initiation of extensional tectonics in western Turkey
Journal of Asian Earth Sciences, 2004Co-Authors: Veysel Işik, Okan Tekeli, Gürol SeyitoğluAbstract:The Simav detachment fault in the northern part of Menderes Core Complex in western Turkey, separates cover sequence rocks with brittle deformation, from high-grade metamorphic (core) rocks and young Granitoid intrusions. The timing of shear zone formation and the intrusion of syn-tectonic Granitoids is constrained by 40Ar/39Ar geochronology on muscovite from mylonitic gneiss, and biotite from the Egrigoz Granitoid. 40Ar/39Ar data indicate that mylonitic deformation occurred at 22.86±0.47 Ma, whilst the cooling age of the Granitoid is 20.19±0.28 Ma. The intrusion and cooling of the Egrigoz Granitoid occurred between ∼23–20 Ma. These data demonstrate that extensional deformation in the northern Menderes Core Complex began before Early Miocene times and represents an early stage in the Tertiary extensional tectonics of western Turkey.
Yaoling Niu - One of the best experts on this subject based on the ideXlab platform.
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geochemical constraints on the petrogenesis of Granitoids in the east kunlun orogenic belt northern tibetan plateau implications for continental crust growth through syn collisional felsic magmatism
Chemical Geology, 2014Co-Authors: Hui Huang, Yaoling Niu, G M Nowell, Zhidan Zhao, Dicheng Zhu, Shuo DingAbstract:Early Triassic syn-collisional Granitoids with mafic magmatic enclaves (MMEs) crop out along the entire East Kunlun Orogenic belt (EKOB) at the northern margin of the Tibetan Plateau. They are andesitic in composition and enriched in light rare earth elements (LREEs) with a flat heavy REE (HREE) pattern. Their average composition resembles that of the bulk continental crust. The enclosed MMEs have the same mineralogy as their host Granitoids, but contain a greater mode of mafic minerals (amphibole and biotite), and thus have higher HREE abundances. Zircon U-Pb dating shows that both the Granitoid hosts and MMEs have the same crystallization age of similar to 250 Ma and indistinguishable bulk rock Sr-Nd-Pb-Hf isotope compositions (I-Sr of 0.7080-0.7116, varying Pb-206/Pb-204(i) of 18.53-19.32, essentially constant epsilon(Nd(t)) of -5.3 to -2.1 and a small range of positive epsilon(Hf(t)), mostly 1.7-5.2). The complete isotopic overlapping between the Granitoid hosts and the MMEs is understood to reflect that the MMEs are disintegrated cumulates formed at an early stage of the Granitoid magma evolution within the same magmatic system. The isotopic data set reveals that the Granitoids are variably evolved melts produced by partial melting of the subducted Paleo-Tethyan oceanic crust with terrigenous sediments under amphibolite-facies conditions in response to the continental collision. (C) 2014 Elsevier B.V. All rights reserved.
