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Title
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The far-field interplay between Neo-Tethys slab break-off and Eocene granitic magmatism in the Sanandaj-Sirjan Zone, Iran
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Type
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JournalPaper
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Keywords
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U–Pb zircon, Sr–Nd isotopes, 40 Ar/39 Ar dating Sanandaj-Sirjan Zone A–type granite, Azna-Dorud region,
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Abstract
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This study investigates the Late Eocene Davarijan granite (sensu stricto) in the northern Sanandaj-Sirjan Zone through integrated whole-rock geochemistry, Sr–Nd isotopes, and zircon U–Pb and white mica 40 Ar/39 Ar geochronology. The new data constrains the timing of crystallization, cooling, and magma sources, providing crucial insights into crustal evolution and tectonic processes in the Azna-Dorud region of the Zagros orogenic system. Zircon U–Pb ages (34.6 ± 1.9 Ma; 35.45 ± 0.42 Ma) and white–mica 40 Ar/39 Ar cooling ages (33.48 ± 0.16 Ma) indicate rapid post-emplacement cooling (∼10.5 °C/Myr) during the Late Eocene and earliest Oligocene. The granites display high-K alkaline, slightly peraluminous com- position and geochemical features typical of A–type granites (specifically of A2; by high Y/Nb). 87Sr/86Sri (0.706741–0.707001), eNd(t)(−0.99 to +0.46), and TDM2 ages (0.85–1.1 Ga), together with the presence of∼ 57 Ma inherited zircons, suggest partial melting of an isotopically rejuvenate ancient felsic crustal source (likely a tonalite) with limited mantle input. These findings strongly support a post-collisional tec- tonic setting linked to the terminal stage of the Neo-Tethys Ocean subduction and provide valuable con- straints on the geodynamic evolution of the Arabia-Eurasia collision zone.
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Researchers
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Yoshihiro ASAHARA (Not In First Six Researchers), Hossein Azizi (Not In First Six Researchers), Johann Genser (Not In First Six Researchers), Franz Neubauer (Not In First Six Researchers), José Francisco Santos (Fifth Researcher), John M Cottle (Fourth Researcher), Alireza Davoudian Dehkordi (Third Researcher), Nahid Shabanian (Second Researcher), Maryam Bendokht (First Researcher)
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