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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


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dc.contributorYener Eyuboglu, yenereyuboglu@gmail.comen_US
dc.creatorEyuboglu, Yener
dc.creatorDudas, Francis
dc.creatorChatterjee, Nilanjan
dc.creatorSantosh, M
dc.creatorBillor, Mehmet
dc.creatorYuva, Sabire
dc.date.accessioned2022-12-07T22:06:55Z
dc.date.available2022-12-07T22:06:55Z
dc.date.created2018
dc.identifier10.1029/2017TC004837en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2017TC004837en_US
dc.identifier.urihttps://aurora.auburn.edu/handle/11200/50477
dc.identifier.urihttp://dx.doi.org/10.35099/aurora-545
dc.description.abstractThe 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 Ar-39/Ar-40 plateau ages of 244.60.5 and 243.160.92Ma and overlap the U-Pb age of titanite from a clinopyroxene-rich sample. Inherited zircons (similar to 460, similar to 880, and similar to 2600Ma) 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.en_US
dc.formatPDFen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.ispartofTectonicsen_US
dc.relation.ispartofseries0278-7407en_US
dc.rights©American Geophysical Union 2018. This is this the version of record co-published by the American Geophysical Union and John Wiley & Sons, Inc. It is made available under the CC-BY-NC-ND 4.0 license. Item should be cited as: Eyuboglu, Y., Dudas, F. O., Chatterjee, N., Santosh, M., Billor, M. Z., & Yuva, S. (2018). 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. Tectonics, 37(9), 3174-3206.en_US
dc.subjectalkalineen_US
dc.subjectTriassicen_US
dc.subjectriebeckiteen_US
dc.subjectGondwanaen_US
dc.subjectriftingen_US
dc.subjectKarakayaen_US
dc.titlePetrology, 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 Marginen_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume37en_US
dc.citation.issue9en_US
dc.citation.spage3174en_US
dc.citation.epage3206en_US
dc.description.statusPublisheden_US
dc.description.peerreviewYesen_US
dc.creator.orcid0000-0002-1073-8477en_US

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