Magmatic signature of the closure of the northern branch of Neo-Tethys : Upper Paleocene-Middle Eocene magmatism at the boundary of Tavşanlı-Sakarya Zone (Turkey)

• Autorzy: Güllü Bahattin , Kadiıoğlu Yusuf Kağan

Identyfikatory

DOI

10.7306/gq.1645

• Języki publikacji: EN

Abstrakty

EN

Numerous plutons composed of granite, granodiorite, diorite-porphyry, monzonite, granodiorite-porphyry and diorite/microdiorite-porphyry occur at the boundary of the TavêanlÏ-Sakarya Zone, in the eastern part of the northwestern Anatolian magmatic belt, Turkey. These rocks belong to two different types: a medium-K calc-alkaline granodiorite series (with associated dykes and sub-volcanic rocks) and a shoshonitic series of granites. The rocks of the shoshonitic series have SiO₂from 67.5 to 75.6 wt.% with Mg# from 35.1 to 59.5, whereas the medium-K calc-alkaline series rocks have SiO₂ between 54.6 and 67.7 wt.% with Mg# from 43.5 to 60.8. There is a clear enrichment of LILE with respect to the HFSE in all magmatic units of the region. These magmatic rocks reflect properties of collision-related arc magmatism in the various geochemical discrimination diagrams. The initial <sup87</sup>Sr/⁸⁶Sr and ¹⁴³Nd/¹⁴⁴Nd istopic ratios of the magmatic units range from 0.705506 to 0.710902 and 0.512178 to 0.512594, respectively. Collision-related granitoids yielded a <sup>40</Sup>Ar/³⁹Ar cooling age age of 59.13 ±1.87 Ma, and arc-related granitoids and associated sub-volcanic units 44.3 ±0.47 and 44.11 ±0.89 Ma. The data obtained revealed that continent-continent collision in the Paleocene together with the initiation of the closure of the Neo-Tethys took place between the Anatolide-Tauride Platform and Sakarya Plate from the end of the Cretaceous. The shoshonotic granite may cooled in the Middle Paleocene, as regards the subduction-accretion zone in which subduction impacts have been observed. The medium-K calc-alkaline magmatic products in the region were formed by partial melting of the continental lithospheric mantle caused by the upwelling of asthenospheric mantle after the subducted slab was delaminated.

Słowa kluczowe

EN

cooling age; subvolcanic phase; shoshonites; enclave; petrological modelling

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2022
• Tom: Vol. 66, No. 2
• Strony: art. no. 13
• Opis fizyczny: Bibliogr. 90 poz., fot., map., rys., tab., wykr.

Twórcy

autor

Güllü Bahattin

• Aksaray University, Faculty of Engineering Department of Geological Engineering, Aksaray, Turkey

autor

Kadiıoğlu Yusuf Kağan

• Ankara University, Earth Sciences Application and Research Centre (YEBIM), Ankara, Turkey
• Ankara University, Faculty of Engineering Department of Geological Engineering, Ankara, Turkey

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).