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Geochemistry and zircon geochronology of the Permian A-type Hasanrobat granite, Sanandaj–Sirjan belt: A new record of the Gondwana break-up in Iran

Alirezaei, Saeed and Hassanzadeh, Jamshid (2012) Geochemistry and zircon geochronology of the Permian A-type Hasanrobat granite, Sanandaj–Sirjan belt: A new record of the Gondwana break-up in Iran. Lithos, 151 . pp. 122-134. ISSN 0024-4937. doi:10.1016/j.lithos.2011.11.015.

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The Sanandaj–Sirjan metamorphic–plutonic Belt (SSB) in west central Iran is a polyphase metamorphic terrain composed of dominantly greenschist-grade metasedimentary and metavolcanic rocks, and felsic to mafic plutons, of Neoproterozoic–Phanerozoic ages. The Hasanrobat granite in central SSB occurs as a single pluton, ~ 20 km^2 surface area, with relatively consistent mineralogy and chemistry. Quartz, alkali feldspars (microcline and perthite), sodic plagioclases and biotite are the main constituents, commonly associated with minor amphibole. Accessory phases include zircon, allanite, apatite, and magnetite. The country rocks are Upper Carboniferous–Lower Permian sandstones and dolomitic limestones. Scattered patches of skarn-type assemblages dominated by tremolite and talc occur in the dolomitic limestones, and sandstones are recrystallized to a coarse-grained quartzite at contact with the granite. The granite is metaluminous to slightly peraluminous, and is distinguished by high FeO_t/MgO ratios, typical of ferroan (A-type) granites. The A-type affinity is also reflected by high Na_2O + K_2O, high Ga/Al ratios, high contents of large ion lithophile elements (LILE), high field strength elements (HFSE) and rare earth elements (REE), as well as low contents of Sr, and distinct negative Eu anomalies. The biotites are aluminous, Fe-rich, and plot near the siderophyllite corner in the quadrilateral biotite diagram. They are further distinguished by high fluorine contents (0.61 to 1.33 wt.%). Amphibole is ferrohastingsite in composition. Ion microprobe analyses of zircon grains separated from a representative granite sample yielded concordant U–Pb ages with weighted mean ^(206)Pb/^(238)U age of 288.3 ± 3.6 Ma. The granite and the country rocks are cut by a set of mafic dykes with asthenosphere-like geochemical signatures. Such association suggests anorogenic intraplate magmatism in Lower Permian in the region. This provides further evidence for, and significantly constrains timing of, a major extension in Upper Paleozoic in Iran, previously inferred from the rock record. The extension led to the Gondwana break-up and the opening of Neotethys Ocean between Sanandaj–Sirjan and Zagros in Permian.

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Additional Information:© 2011 Elsevier B.V. Received 14 April 2011. Accepted 19 November 2011. Available online 1 December 2011. This study was partly supported by Shahid Beheshti University grant no. 600/3205 to SA and Tectonics Observatory of California Institute of Technology, USA. The U–Pb data acquisition at UCLA has benefited from valuable assistance by Axel Schmitt and the National Science Foundation grant EAR-0337775 to Horton and Axen. The ion microprobe facility at UCLA is partly supported by a grant from the Instrumentation and Facilities Program, Division of Earth Sciences, National Science Foundation. We are grateful to two anonymous reviewers and the guest associate editor for their constructive comments.
Funding AgencyGrant Number
Shahid Beheshti University600/3205
Caltech Tectonics ObservatoryUNSPECIFIED
NSF Division of Earth Sciences Instrumentation and Facilities ProgramUNSPECIFIED
Subject Keywords:Hasanrobat; Sanandaj–Sirjan belt; A-type granite; Permian; Neotethys; Gondwana
Record Number:CaltechAUTHORS:20121101-105003908
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Official Citation:Saeed Alirezaei, Jamshid Hassanzadeh, Geochemistry and zircon geochronology of the Permian A-type Hasanrobat granite, Sanandaj–Sirjan belt: A new record of the Gondwana break-up in Iran, Lithos, Volume 151, 15 October 2012, Pages 122-134, ISSN 0024-4937, 10.1016/j.lithos.2011.11.015. (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35241
Deposited By: Ruth Sustaita
Deposited On:01 Nov 2012 18:08
Last Modified:09 Nov 2021 23:13

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