Abstract
The gabbroic plutonic bodies of the Southern Caspian Sea are located in the North of Iran and are made up of olivine, clinopyroxene, plagioclase, and Fe-Ti oxides. They show a narrow range of SiO2 and MgO and are relative to two distinct groups: one enriched in TiO2 with alkali signature and another one low TiO2 with tholeiitic signature. The rocks are enriched in incompatible trace elements such as Zr, Nb, and Y. Normalized trace element patterns and diagnostic elemental ratio are very similar to those of modern ocean-island basalts (OIB) and may be derived from a high U/Pb (HIMU) source with slightly elevated K and Ba contents. There is no evidence of significant crustal contamination; this may be related to the rapid ascent of the parental magma. Rare earth element modelling shows that a low degree of partial melting (1–5% for alkali and 5–20% for tholeiite) of an asthenospheric mantle source in the Garnet + Spinel lherzolite stability field should be responsible for the magmatic origin of that. All data show the studied rocks were generated in a within-plate extension setting above of S.A.Q subduction zone. Activity of a deep plume source with together of rollback of Sevan-Akera-Qaradagh subducted slab, provides the material needed for the investigated OIB gabbros magma source. Therefore, a series of OIA-OIT-OIA-ARC (BAB) rocks are created from S.A.Q. suture zone to south.
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Acknowledgements
The authors would like to thank Dr. Gharabeigli which helped us to significantly improve this manuscript. We gratefully thank the editor and an anonymous reviewer for their critical reviews and constructive comments that have improved the quality of this paper. Also, the authors wish to thank the Office of Graduate Studies of the Islamic Azad University, Lahijan Branch.
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The funding of this survey was provided by Islamic Azad University of Lahijan and was a part of the Project entitled "Petrology and geochemistry of post-Cretaceous mafic and ultramafic magmatism in Northern Iran, Western Mazandaran".
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All authors contributed to the study conception and design. Fieldwork and petrographic studies manuscript organization, and writing were carried out by Mojgan Salavati and Vahid Rezania ye Komachaly, and data interpretation was done by three authors.
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Komachaly, V.R.y., Salavati, M. & kandelus, A.M. Geochemistry and tectono-magmatic setting of OIT plutonic gabbros in Northern Iran: New evidence for the Oceanic Plume magmatism in the Southern Caspian Sea. Arab J Geosci 15, 1060 (2022). https://doi.org/10.1007/s12517-021-09363-7
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DOI: https://doi.org/10.1007/s12517-021-09363-7