Mesozoic back-arc extension in the active margin of the Iranian continental block

constraints from age and geochemistry of the mafic lavas

Hadi Shafaii Moghadam, Mohamad Rahgoshay, Hubert Whitechurch

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The Nain-Baft ophiolitic suture, along the active margin of the Central Iranian continental block (the Sanandaj-Sirjan zone) features back-arc extension during the Late Mesozoic. This ophiolitic belt is characterized by occurrence of mafic lavas including pillow lavas, diabasic dikes and layers, massive basaltic lavas and basaltic-andesitic rock fragments in the volcanic breccias. These mafic lavas display both calc-alkaline and island-arc tholeiitic affinities with enrichment in LILE and depletion in HFSE. Conventional K-Ar measurements on amphibole indicate the Middle Cretaceous for the creation and evolution of the Nain-Baft back-arc basins. As a result of oblique subduction of the Tethyan Ocean, a narrow transtensional back-arc basin could start to open along large transcurrent faults in the active margin of the Iranian continental block.

Original languageEnglish
Pages (from-to)95-103
Number of pages9
JournalOfioliti
Volume33
Issue number2
Publication statusPublished - 2008
Externally publishedYes

Keywords

  • Back-arc extension
  • Calc-alkaline trend
  • Iran
  • Island-arc tholeiitic trend
  • K-ar age
  • Nain-baft
  • Ophiolites

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