A Jurassic volcanic passive margin in Iran and Turkey


Azizi H., Stern R. J., KANDEMİR R., KARSLI O.

Terra Nova, vol.35, no.3, pp.141-152, 2023 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Review
  • Volume: 35 Issue: 3
  • Publication Date: 2023
  • Doi Number: 10.1111/ter.12638
  • Journal Name: Terra Nova
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aquatic Science & Fisheries Abstracts (ASFA), Environment Index, Geobase, INSPEC
  • Page Numbers: pp.141-152
  • Karadeniz Technical University Affiliated: Yes

Abstract

© 2022 John Wiley & Sons Ltd.Broadly similar Early to Middle Jurassic stratigraphic sequences including bimodal igneous rocks of the Sanandaj–Sirjan Zone of Iran and the Sakarya Zone of Turkey suggest that these formed in a common tectonic setting in an extensional basin that evolved from a terrestrial magmatic rift to a marine shelf and passive continental margin. Whole-rock chemistry and Sr–Nd isotope signatures indicate derivation of mafic melts from partial melting of the subcontinental lithosphere. Decompression associated with extension led to 5%–30% partial melting of spinel–garnet lherzolite with minor involvement of continental crust, producing tholeiitic to transitional basaltic magma. Extensional basins inverted during the Mid-Late Jurassic. These relationships suggest the Early to Middle Jurassic formation of a volcanic rifted margin on the SW Eurasian margin, similar to that of offshore Norway.