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GEOREF RECORD

The eastern Khoy metamorphic complex of NW Iran; a Jurassic ophiolite or continuation of the Sanandaj-Sirjan Zone?

Hadi Shafaii Moghadam, Fernando Corfu, Robert J. Stern and Ali Lotfibakhsh
The eastern Khoy metamorphic complex of NW Iran; a Jurassic ophiolite or continuation of the Sanandaj-Sirjan Zone?
Journal of the Geological Society of London (December 2018) 176 (3): 517-529

Abstract

The Khoy complex in NW Iran has been widely regarded to consist of both Jurassic and Cretaceous ophiolites but, while the western Late Cretaceous ophiolite is unequivocal, the nature of the eastern Jurassic body has been unclear. Field observations show that the presumed eastern meta-ophiolite has no similarities to an ophiolite sequence. Here, we report geological and zircon-rutile-titanite U-Pb data for rocks from the presumed Jurassic ophiolite obtained to verify whether these are real ophiolitic units and to understand their relations either to the Late Cretaceous Zagros-Bitlis ophiolites in W Iran-S Anatolia or to the Sevan-Akera (N Armenia) and Izmir-Ankara (S Pontides) complexes. The new U-Pb ages show that the "presumed" ophiolite is in fact a collage of Ediacaran to Cambrian ( approximately 606-517 Ma) and Jurassic ( approximately 160 Ma) meta-igneous rocks, similar to ages obtained for igneous rocks of the Sanandaj-Sirjan Zone, which has been interpreted as a Jurassic continental rift. The Jurassic igneous rocks contain abundant Ediacaran, Ordovician-Silurian and Carboniferous-Permian inherited zircons, further suggesting involvement of pre-existing continental crust. Our results indicate that Jurassic continental rifting provided a lithospheric weakness along which a new subduction zone formed in Late Cretaceous times.


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 176
Serial Issue: 3
Title: The eastern Khoy metamorphic complex of NW Iran; a Jurassic ophiolite or continuation of the Sanandaj-Sirjan Zone?
Affiliation: University of Mohaghegh Ardabili, Department of Geology, Damghan, Iran
Pages: 517-529
Published: 20181221
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 79
Accession Number: 2019-007114
Categories: Igneous and metamorphic petrologyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, geol. sketch maps
N38°34'60" - N39°00'00", E44°30'00" - E45°00'00"
Secondary Affiliation: University of Texas at Dallas, USA, United StatesUniversity of Mohaghegh Ardabili, IRN, IranUniversity of Oslo, NOR, Norway
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201906
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