Cenozoic forearc gabbros from the northern zone of the Eastern Pontides Orogenic Belt, NE Turkey: Implications for slab window magmatism and convergent margin tectonics

Eyüboğlu, Yener; Dudás, Francis Ő.; Santosh, M.; Zhu, Di‐Cheng; Yi, Keewook; Chatterjee, Nilanjan; Jeong, Youn-Joong; Akaryalı, Enver; Liu, Ze

doi:10.1016/j.gr.2015.07.006

Cited by 48 publications

(21 citation statements)

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“…Assimilant values are taken from Köksal et al (2013) thickening and melting of continental crust (Topuz et al, 2005), and direct generation by a subducting lithospheric slab (Eyuboglu et al, 2016). The data presented above give a clear explanation of the possible generation processes of the trachytic volcanism along the IAESZ; hence, it is not feasible to construct the whole-scale geodynamic evolution of the Early Cenozoic evolution of the region.…”

Section: Geodynamic Implicationsmentioning

confidence: 99%

“…The vanishing of the northern branch of the Neo-Tethyan ocean during the Cretaceous and subsequent collision of the Pontides and Anatolide-Tauride microcontinents with the CACC in the Paleocene gave rise to a long and narrow ophiolitic mélange belt called the IAESZ at the northern part of the Anatolian Plate (Şengör and Yılmaz, 1981;Okay and Tüysüz, 1999) (Figure 1a). Around both sides and along this suture zone, postcollisional Eocene magmatism (particularly Middle Eocene) developed through the western to eastern part of the Anatolian Plate and is represented by granitoids (Harris et al, 1994;Genç and Yılmaz, 1997;Topuz et al, 2005;Arslan and Aslan, 2006;Okay and Satır, 2006;Karslı et al, 2007Karslı et al, , 2011Boztuğ, 2008;Karacık et al, 2008;Ustaömer et al, 2009;Altunkaynak et al, 2012;Gülmez et al, 2013;Öztürk, 2015, Özdamar et al 2017), gabbroic intrusions (Boztuğ et al, 1998;Temizel et al, 2014;Eyuboglu et al, 2016), and calcalkaline, mildly alkaline, and potassic/shoshonitic volcanic products (Figure 1b;Peccerillo and Taylor, 1976;Keskin et al, 2008 and references therein; Karslı et al, 2011, Kaygusuz et al, 2011Arslan et al, 2013 and references therein; Aydınçakır and Şen, 2013;Dokuz et al, 2013;Gülmez et al, 2013;Aslan et al, 2014;Aydınçakır, 2014, Sipahi et al, 2014Yücel et al, 2014;Kasapoğlu et al, 2016;Temizel et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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40Ar-39Ar geochronology and petrogenesis of postcollisional trachytic volcanism along the İzmir-Ankara-Erzincan Suture Zone (NE, Turkey)*

Göçmengil¹,

Karacık²,

Genç³

et al. 2018

Turkish J Earth Sci

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The obliteration of the Neo-Tethyan Ocean and collision of the microplates along the northern part of Turkey led to the development of the İzmir-Ankara-Erzincan suture zone (IAESZ). After the collision of Pontides with the Central-Anatolian Crystalline Complex (CACC) in the Paleocene, a new phase of extension and volcanism concomitantly developed along the northern (Almus; Pontides) and southern (Yıldızeli; CACC) sides and along the IAESZ during the Middle Eocene time interval. The first products of the Middle Eocene volcanism in these areas are represented by calc-alkaline to alkaline (basic-intermediate) volcanic and volcanoclastic units together with late-stage trachytic dikes, plugs, and stocks. The mantle source area of both volcanic units displays a metasomatized character, which was dominantly fluxed by sediment-sourced melts. The partial melting of the metasomatized source area gave rise to first-stage basic-intermediate volcanism in the crustal levels. Simultaneously with the generation of the first-stage volcanism, basaltic trachyandesitic shallow-seated magma mushes were also developed. The reactivation of these shallow-seated mushes by latestage extensional tectonics gave rise to the development of trachytic volcanism in both regions, which have a high-K to shoshonitic character. Almus trachytic lavas are phenocryst-poor and have differentiated Mg# numbers (avg. 26). On the other hand, Yıldızeli trachytic lavas have a broad compositional range (benmoreite to latite); they are phenocryst-rich and show more basic character (Mg# avg. 40). Trachytic volcanism in both areas is largely controlled by fractional crystallization of similar basaltic trachyandesitic parental magma with minor assimilation of the upper crustal lithologies. 40 Ar-39 Ar ages from sanidine phenocrysts from both areas also confirm that trachytic volcanism in both regions developed nearly coevally in different tectonic blocks (~41-40 Ma). Generation of similar volcanism on the different tectonic blocks during the postcollisional stage was probably governed by a regional-scale delamination and/ or lithospheric removal-related tectonomagmatic processes.

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Section: Geodynamic Implicationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

40Ar-39Ar geochronology and petrogenesis of postcollisional trachytic volcanism along the İzmir-Ankara-Erzincan Suture Zone (NE, Turkey)*

Göçmengil¹,

Karacık²,

Genç³

et al. 2018

Turkish J Earth Sci

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“…Measurements of U, Th, and Pb of titanite grains extracted from a fine‐grained clinopyroxene‐rich metagabbro sample (SY‐2) for U‐Pb analysis were made using the Cameca IMS‐1280 SIMS at the Institute of Geology and Geophysics, China Academy of Sciences (Beijing, China). Analytical details are described in Eyuboglu, Dudas, Santosh, Zhu, et al ().…”

Section: Methodsmentioning

confidence: 99%

“…Alaskan‐type mafic‐ultramafic intrusions (Eyuboglu et al, ; Eyuboglu, Dudas, Santosh, Xiao, et al, ; Eyuboglu, Santosh, Bektaş, & Chung, ) span Carboniferous to Late Triassic time and were followed by numerous arc‐related magmatic series: early to middle Jurassic tholeiitic to calc‐alkaline felsic and mafic intrusions (Eyuboglu, Dudas, Santosh, Xiao, et al, ), late Cretaceous shoshonitic and ultrapotassic volcanic rocks (Eyuboglu, ; Eyuboglu, Chung, et al, ), late Paleocene‐early Eocene adakitic intrusions (Eyuboglu, Chung, et al, ; Eyuboglu et al, ; Eyuboglu, Dudas, et al, ; Eyuboglu, Santosh, & Chung ; Eyuboglu, Santosh, Dudas, et al, ; Eyuboglu, Santosh, et al, ; Topuz et al, ), Lutetian nonadakitic granitic intrusions (Arslan & Aslan, ; Eyuboglu, Santosh, et al, ; Eyuboglu et al, ; Karslı et al, ; Kaygusuz & Öztürk, ), and late Miocene adakitic porphyries (Eyuboglu et al, ). Pre‐Mesozoic ultramafic‐mafic rocks (the Kop and Erzincan massifs), a Cretaceous ophiolitic olistostromal melange, and Miocene volcanic and pyroclastic rocks are widespread in the far southern part of the belt (Eyuboglu et al, ; Eyuboglu, Dudas, et al, ; Eyuboglu, Dudas, Santosh, Zhu, et al, ).…”

Section: Geological Backgroundmentioning

confidence: 99%

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Petrology, Geochronology and Tectonic Setting of Early Triassic Alkaline Metagabbros From the Eastern Pontide Orogenic Belt (NE Turkey): Implications for the Geodynamic Evolution of Gondwana's Early Mesozoic Northern Margin

et al. 2018

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The Triassic geodynamic evolution of the Pontides Belt, which geographically corresponds to northern Anatolia, is still a matter of debate. We present and interpret geological, petrographical, geochemical, and geochronological data from small, discordant, metagabbroic rocks exposed in the Tokat Massif. Field and petrographic characteristics distinguish four subgroups: (i) medium‐grained, slightly lineated, clinopyroxene‐rich metagabbros; (ii) fine‐grained, nonlineated, clinopyroxene‐rich metagabbros; (iii) medium‐grained, nonlineated, brown amphibole‐rich metagabbros; and (iv) medium‐grained, slightly lineated, brown and blue amphibole‐rich metagabbros. Magmatic kaersutites give 39Ar/40Ar plateau ages of 244.6 ± 0.5 and 243.16 ± 0.92 Ma and overlap the U‐Pb age of titanite from a clinopyroxene‐rich sample. Inherited zircons (~460, ~880, and ~2600 Ma) in fine‐grained clinopyroxene‐rich metagabbros indicate interaction with a range of crustal rocks during the intrusion. The blue amphiboles are magnesioriebeckites that formed during metamorphism or late‐stage crystallization. Geochemical data, including whole rock major and trace element concentrations, and Sr‐Nd‐Pb isotope compositions reveal that both clinopyroxene‐ and amphibole‐rich metagabbros are alkaline in composition but derived from distinct mantle sources. They are compositionally distinct from mafic igneous rocks in the contemporaneous Permo‐Triassic Karakaya Complex that is well exposed in the western part of the Pontides Belt. Considering all data, we suggest that the Pontides Belt was shaped above a south dipping subduction zone during Permo‐Triassic and the alkaline gabbros that were emplaced into crustal rocks during Early Triassic back‐arc rifting of the northern margin of Gondwana.

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Volcanism and Tectonic Setting

Wright,

Giordano,

Cas

2024

Springer Textbooks in Earth Sciences, Geography and Environment

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Cenozoic forearc gabbros from the northern zone of the Eastern Pontides Orogenic Belt, NE Turkey: Implications for slab window magmatism and convergent margin tectonics

Cited by 48 publications

References 82 publications

40Ar-39Ar geochronology and petrogenesis of postcollisional trachytic volcanism along the İzmir-Ankara-Erzincan Suture Zone (NE, Turkey)*

40Ar-39Ar geochronology and petrogenesis of postcollisional trachytic volcanism along the İzmir-Ankara-Erzincan Suture Zone (NE, Turkey)*

Petrology, Geochronology and Tectonic Setting of Early Triassic Alkaline Metagabbros From the Eastern Pontide Orogenic Belt (NE Turkey): Implications for the Geodynamic Evolution of Gondwana's Early Mesozoic Northern Margin

Volcanism and Tectonic Setting

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