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The Sr, Nd, Pb and Hf isotopes and crystallization conditions of the middle Eocene Dağdibi Pluton in the eastern Sakarya Zone, Turkey

Published online by Cambridge University Press:  07 June 2023

Ferkan Sipahi Open the ORCID record for Ferkan Sipahi [Opens in a new window] ,
Mehmet Ali Gücer Open the ORCID record for Mehmet Ali Gücer [Opens in a new window] ,
Abdurrahman Dokuz Open the ORCID record for Abdurrahman Dokuz [Opens in a new window] ,
Keewook Yi Open the ORCID record for Keewook Yi [Opens in a new window] ,
Abdullah Kaygusuz Open the ORCID record for Abdullah Kaygusuz [Opens in a new window] ,
Enver Akaryalı Open the ORCID record for Enver Akaryalı [Opens in a new window] ,
Çiğdem Saydam Eker Open the ORCID record for Çiğdem Saydam Eker [Opens in a new window]  and
Cüneyt Doruk Open the ORCID record for Cüneyt Doruk [Opens in a new window]
Ferkan Sipahi*
Affiliation:
Department of Geological Engineering, Gümüşhane University, Gümüşhane, Turkey
Mehmet Ali Gücer
Affiliation:
Department of Geological Engineering, Gümüşhane University, Gümüşhane, Turkey
Abdurrahman Dokuz
Affiliation:
Department of Geological Engineering, Gümüşhane University, Gümüşhane, Turkey
Keewook Yi
Affiliation:
Geochronology Team, Korea Basic Science Institute, Chungbuk, South Korea
Abdullah Kaygusuz
Affiliation:
Department of Geological Engineering, Gümüşhane University, Gümüşhane, Turkey
Enver Akaryalı
Affiliation:
Department of Geological Engineering, Gümüşhane University, Gümüşhane, Turkey
Çiğdem Saydam Eker
Affiliation:
Department of Geological Engineering, Gümüşhane University, Gümüşhane, Turkey
Cüneyt Doruk
Affiliation:
Gümüşhane University, Graduate Education Institute, Gümüşhane, Turkey
*
Corresponding author: F. Sipahi; Email: ferkansipahi@gmail.com
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Abstract

Magmatic activity in the Sakarya Zone, an important segment of the Alpine orogenic belt, continues intermittently from the middle Carboniferous to Miocene. In this study, we provide geochronological and geochemical data from the Dağdibi Pluton in the eastern Sakarya Zone to present some inferences on the source region and petrogenesis of the middle Eocene magmatism. U–Pb zircon geochronology from two granodiorite samples gives middle Eocene ages of 44.75 ± 0.92 and 45.01 ± 0.59 Ma. The pluton is mainly composed of K-feldspar, plagioclase, quartz, Mg-hornblende/actinolite, Fe–Ti oxides and small amounts of biotite, and secondary chlorite and epidote. Parental magma of the intrusive rocks has a high-K calc-alkaline affinity with metaluminous character. The oxygen fugacity values vary between −18 and −17. The rocks show slightly radiogenic 87Sr/86Sr(i) (0.704845–0.705726) ratios and ϵNdi values between −0.96 and +0.52. Pb–Pb isotope ratios are typical for those of the lower continental crust. ϵHf(i) values of the zircons range from 0.14 to 10.26. The geochemical and isotopic features of the pluton point to a parental magma derived from a depleted mantle that was metasomatized by fluids during previous subduction events. The volumetric abundances of the rock types are decreased as the silica content increase, implying that the fractional crystallization is the most important process during the formation of the present compositional range of the pluton. Amphibole, plagioclase and Fe–Ti oxides are the fractionated phases while K-feldspar is largely accumulated. In the light of the data presented above, slab breakoff is regarded as the geodynamic process responsible for the formation of the Dağdibi Pluton in the middle Eocene.

Keywords

EoceneHf Isotopenon-adakitic PlutonSr–Nd–Pb isotopesSakarya ZoneTurkey
Type
Original Article
Information
Geological Magazine , Volume 160 , Issue 6 , June 2023 , pp. 1193 - 1210
Copyright
© The Author(s), 2023. Published by Cambridge University Press

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