Miocene uplift and exhumation history of northwestern Anatolia (Turkey): Implications from apatite (U-Th)/He thermochronology of syn-extensional plutons

Şafak Altunkaynak*, Alp Ünal, Gürsel Sunal, Ömer Kamacı, István Dunkl

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Özet

In this study, we report the first robust apatite (U-Th)/He thermochronology data from the syn-extensional Eybek, Solarya and Çataldağ plutons from NW Turkey. The Solarya and Çataldağ plutons display similar (U-Th)/He apatite ages which range from 21.5 ± 1.6 to 12 ± 1.9 and 22.4 ± 1.2 to 13.7 ± 1.3 Ma, respectively. The Eybek Pluton, on the other hand, yielded younger (U-Th)/He apatite ages between 8.4 ± 1.9 Ma and 5.6 ± 0.5 Ma. Exhumation rates of the plutons change between 214 m/Myr and 122 m/Myr. The exhumation rates and thermal modelling results show that the Solarya and Çataldağ plutons experienced fast uplift and exhumation from early to middle Miocene. A low angle detachment fault(s) associated with Çataldağ Metamorphic Core Complex was responsible for the exhumation of the Çataldağ and Solarya plutons. In contrast, late Miocene cooling and exhumation of the Eybek Pluton was controlled by high angle normal faults. The collective evaluation of our data together with published low-temperature thermochronology data obtained from the spatially associated basement rocks and the metamorphic core complexes indicate that the region-wide exhumation of NW Anatolia was accommodated by different fault systems throughout the Miocene. We infer that the crustal exhumation in northwestern and centralwestern Anatolia occurred contemporaneously during the Miocene, and developed as a result of back-arc extension driven by slab roll-back beneath Hellenic arc and the preceding thermal weakening of the western Anatolian orogenic crust.

Orijinal dilİngilizce
Makale numarası104770
DergiJournal of Asian Earth Sciences
Hacim213
DOI'lar
Yayın durumuYayınlandı - 15 Haz 2021

Bibliyografik not

Publisher Copyright:
© 2021 Elsevier Ltd

Finansman

This study was supported in part by a research grant from Istanbul Technical University (BAP Project No: 40647). We thank to Y. Yılmaz and Y. Dilek for fruitful discussions on the Cenozoic tectonics of western Anatolia. We also would like to thank I.N. Güraslan and S.B. Bayrak for their assistance in the lab works. Constructive and thorough reviews by W. Cavazza and two anonymous referees, and efficient editing by editor İ. Uysal helped us improve the paper greatly. This study was supported in part by a research grant from Istanbul Technical University (BAP Project No: 40647). We thank to Y. Y?lmaz and Y. Dilek for fruitful discussions on the Cenozoic tectonics of western Anatolia. We also would like to thank I.N. G?raslan and S.B. Bayrak for their assistance in the lab works. Constructive and thorough reviews by W. Cavazza and two anonymous referees, and efficient editing by editor ?. Uysal helped us improve the paper greatly.

FinansörlerFinansör numarası
Cenozoic tectonics of western Anatolia
British Association for Psychopharmacology40647
Istanbul Teknik Üniversitesi

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