Late Paleocene – Middle Eocene magmatic flare-up in western Anatolia

Aral I. Okay*, Gültekin Topuz, Andrew R.C. Kylander-Clark, Sarah Sherlock, Massimiliano Zattin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

A 3000-km long magmatic belt of predominantly Eocene age extends from Anatolia into Iran representing a major magmatic flare-up. We present new zircon U-Pb, Ar/Ar mica and apatite fission-track ages for this magmatism from northwestern Turkey, and review its geochemistry and geodynamic setting. The new age data show that magmatism started at the Late Paleocene (58 Ma) during the final stages of continental collision and continued into the early Middle Eocene (45 Ma) with most of the magmatism taking place in the Early-Middle Eocene (54 to 45 Ma). The Late Paleocene-Middle Eocene magmatism is separated from Late Cretaceous and Oligo-Miocene magmatic flare-ups by periods of magmatic quiescence. The Late Paleocene-Middle Eocene magmatism consists of plutonic and volcanic belts. The plutonic belt cuts across and post-dates the İzmir-Ankara suture. The plutonic rocks are mainly middle- to high-K calc-alkaline I-type granodiorite and granite, and the volcanic rocks are middle- to high-K calc-alkaline basalt, basaltic andesite and andesite. Geochemically, all the rocks are similar to those found in subduction-related environments. Crustal thicknesses calculated based on geochemistry suggest a thickened crust (60–70 km) at 58 to 54 Ma, and a relatively thin crust (ca. 40 km) at 54 to 45 Ma, which match with uplift and erosion during the Late Paleocene, and marine sedimentation during the Early-Middle Eocene in northwest Anatolia, respectively. The Late Paleocene-Middle Eocene magmatism is tentatively assigned to subduction of the southern branch of the Neo-Tethys.

Original languageEnglish
Article number106816
JournalLithos
Volume428-429
DOIs
Publication statusPublished - 1 Nov 2022

Bibliographical note

Publisher Copyright:
© 2022 Elsevier B.V.

Funding

This study is supported by the TÜBİTAK projects 113R007 and 116Y127 and by TÜBA . We thank Gürsel Sunal and Ezgi Sağlam for help with zircon data analysis and Ersin Koralay for one of the samples. Roberts Moritz and an anonymous reviewer provided detailed and constructive comments, which improved the manuscript.

FundersFunder number
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu116Y127, 113R007

    Keywords

    • Geochronology
    • Magmatic flare-up
    • Paleocene-Eocene magmatism
    • Post-collision
    • Slab break-off
    • Subduction
    • Western Anatolia

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