Petrogenesis of mafic rocks from northwest Iran (Piranshahr) and comparison with northeast Iraq ophiolites: Implications for slab window magmatism in an evolving Neotethys arc

The Piranshahr ophiolite is located in northwest Iran. The Mawat ophiolite in northeast Iraq is the western continuation of the Piranshahr ophiolite. The whole rock geochemistry of mafic rocks from the Piranshahr ophiolite (in the Gerdikavalan regions) is studied and compared with mafic rocks from t...

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Bibliographic Details
Published in:The island arc 2023-01, Vol.32 (1), p.n/a
Main Authors: Yazdani, Maryam, Moazzen, Mohssen, Oberhänsli, Roland
Format: Article
Language:English
Subjects:
Asthenosphere
Basalt
Continental crust
Continental margins
Cretaceous
Eocene
Fluids
Geochemistry
mafic rocks
Magma
Melting
northwest Iran
Oceanic islands
Oligocene
Ophiolites
Petrogenesis
Piranshahr
Rock
Rocks
Signatures
slab window
Subduction
supra‐subduction
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Summary:The Piranshahr ophiolite is located in northwest Iran. The Mawat ophiolite in northeast Iraq is the western continuation of the Piranshahr ophiolite. The whole rock geochemistry of mafic rocks from the Piranshahr ophiolite (in the Gerdikavalan regions) is studied and compared with mafic rocks from the Mawat ophiolite in northeast Iraq (in the Hasanbag, Walash and Naopurdan regions). Two groups can be identified among the ophiolitic basalts in northwest Iran and northeast Iraq. The first one is represented by Late Cretaceous calc‐alkaline basalts, displaying typical active continental margin signatures and thought to have been derived from the melting of enriched mantle sources modified by continental crust and subduction fluids. The second group is characterized by Eocene–Oligocene tholeiitic basalts, displaying signatures intermediate between mid‐ocean ridge basalt (MORB) and oceanic island basalt (OIB) and back‐arc basin (BAB) like magmas and suggested to have been derived from the melting of mixed asthenospheric‐lithospheric mantle sources in a slab window. We propose that the subduction signature is acquired by interaction of the mantle advected through the slab window in the upper part of the subducting plate.
ISSN:1038-4871
1440-1738
DOI:10.1111/iar.12481