Age, Geochemistry, and Emplacement of the ~40-Ma Baneh Granite-Appinite Complex in a Transpressional Tectonic Regime, Zagros Suture Zone, Northwest Iran

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dc.contributor.ORCID0000-0002-8083-4632 (Stern, RJ)
dc.contributor.VIAF284885305 (Stern, RJ)
dc.contributor.authorAzizi, Hossein
dc.contributor.authorHadad, Sepideh
dc.contributor.authorStern, Robert J.
dc.contributor.authorAsahara, Yoshihiro
dc.contributor.utdAuthorStern, Robert J.
dc.date.accessioned2020-09-17T16:23:46Z
dc.date.available2020-09-17T16:23:46Z
dc.date.issued2018-01-12
dc.descriptionDue to copyright restrictions and/or publisher's policy full text access from Treasures at UT Dallas is limited to current UTD affiliates (use the provided Link to Article).
dc.description.abstractThe Baneh plutonic complex is situated in the Zagros suture zone of northwest Iran between the Arabian and Eurasian plates. This complex is divided into granite and appinite groups. Zircon U-Pb dating shows that granites crystallized 41-38 million years ago but appinites experience more protracted magmatic evolution, from at 52 to 38 Ma. Whole-rock chemical compositions show significant major and trace element variations between the two lithologies. Granitic rocks are more evolved, with high contents of SiO₂ (62.4-77.0 wt%), low contents of TiO₂ (0.25 wt%), MgO (0.05-1.57 wt%), and Fe₂O₃ (0.40-4.06 wt%) and high contents of Na₂O + K₂O (approximate to 10 wt%). In contrast, appinites have low contents of SiO₂ (51.0-57.0 wt%) and K₂O (<2.1 wt%) and high Fe₂O₃ (6.4-9.35 wt%), MgO (2.0-9.9 wt%), and Mg number (Mg# = 35-76). The concentration of rare earth elements in the appinites is higher than in granitic rocks, making it difficult to form granites solely by fractionation of appinite magma. (⁸⁷Sr/⁸⁶Sr)ᵢ and ε_{Nd(40 Ma)} in both groups are similar, from 0.7045 to 0.7061 and -1.2 to +2.6, except for a primitive gabbroic dike with ε_{Nd(40 Ma)}) = +9.9. Appinites show mainly typical I-type characteristics, but granites have some S-type characteristics. The sigmoidal shape of the Baneh pluton and its emplacement into deformed Cretaceous shales and limestone showing kink bands, asymmetric and recumbent folds in a broad contact zone, with pervasive ductile to brittle structures in both host rocks and intrusion, indicate that magma emplacement was controlled by a transpressional tectonic regime, perhaps developed during early stages in the collision of Arabia and Eurasian plates.
dc.description.departmentSchool of Natural Sciences and Mathematics
dc.description.sponsorshipNagoya University in Japan and JSPS KAKENHI: [Grant Number 17H01671], Japan
dc.identifier.bibliographicCitationAzizi, Hossein, Sepideh Hadad, Robert J. Stern, and Yoshihiro Asahara. 2019. "Age, geochemistry, and emplacement of the similar to 40-Ma Baneh granite-appinite complex in a transpressional tectonic regime, Zagros suture zone, northwest Iran." International Geology Review 61(2): 195-223, doi: 10.1080/00206814.2017.1422394
dc.identifier.issn0020-6814
dc.identifier.issue2
dc.identifier.urihttps://dx.doi.org/10.1080/00206814.2017.1422394
dc.identifier.urihttps://hdl.handle.net/10735.1/8903
dc.identifier.volume61
dc.language.isoen
dc.publisherTaylor & Francis Inc
dc.rights©2018 Informa UK Limited
dc.source.journalInternational Geology Review
dc.subjectGranite
dc.subjectAppinite
dc.subjectEocene Geologic Epoch
dc.subjectMiddle East--Zagros Mountains
dc.subjectIran
dc.subjectSanandaj-sirjan zone
dc.subjectZircon—Uranium-lead dating
dc.subjectIsotopies (Topology)
dc.subjectGeology
dc.subjectArc-continent collision
dc.titleAge, Geochemistry, and Emplacement of the ~40-Ma Baneh Granite-Appinite Complex in a Transpressional Tectonic Regime, Zagros Suture Zone, Northwest Iran
dc.type.genrearticle

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