Early Cretaceous migmatitic mafic granulites from the Sabzevar range (NE Iran): implications for the closure of the Mesozoic peri-Tethyan oceans in central Iran

Terra Nova, 22, 26–34, 2010 The ophiolitic mélange of the Sabzevar Range (northern Iran) is a remnant of the Mesozoic oceanic basins on the northern margin of the Neotethys that were consumed during the Arabia–Eurasia convergence history. Occurrence of km‐scale, dismembered mafic HP granulitic slice...

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Published in:Terra nova (Oxford, England) England), 2010-02, Vol.22 (1), p.26-34
Main Authors: Rossetti, Federico, Nasrabady, Mohsen, Vignaroli, Gianluca, Theye, Thomas, Gerdes, Axel, Razavi, Mohammad Hossein, Vaziri, Hosein Moin
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Language:English
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Geology
Geophysics
Metamorphic rocks
Plate tectonics
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description Terra Nova, 22, 26–34, 2010 The ophiolitic mélange of the Sabzevar Range (northern Iran) is a remnant of the Mesozoic oceanic basins on the northern margin of the Neotethys that were consumed during the Arabia–Eurasia convergence history. Occurrence of km‐scale, dismembered mafic HP granulitic slices is reported in this study. Granulites record an episode of amphibole‐dehydratation melting and felsic (tonalite/throndhjemite) melt segregation at c. 1.1 GPa and 800 °C. In situ U(‐Th)–Pb geochronology of zircon and titanite grains hosted in melt segregations points to an Early Cretaceous (Albian) age for the metamorphic climax. Results of this study (i) impose reconsideration of the current palaeotectonic models of the Neothetyan convergent margin during the Early Cretaceous and (ii) argue that punctuated events of subduction of short‐lived back‐arc oceanic basins accompanied the long‐lasting history of the Neotethyan subduction in the region.
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subjects Geology
Geophysics
Metamorphic rocks
Plate tectonics
title Early Cretaceous migmatitic mafic granulites from the Sabzevar range (NE Iran): implications for the closure of the Mesozoic peri-Tethyan oceans in central Iran
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