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Crust-mantle interaction inferred from the petrology and Sr-Nd-Pb isotope geochemistry of Eocene arc lavas from the Kahrizak Mountains, north-Central Iran

Yazdani, Sima and Castillo, Paterno R. and Hassanzadeh, Jamshid (2018) Crust-mantle interaction inferred from the petrology and Sr-Nd-Pb isotope geochemistry of Eocene arc lavas from the Kahrizak Mountains, north-Central Iran. Lithos, 318-319 . pp. 299-313. ISSN 0024-4937. http://resolver.caltech.edu/CaltechAUTHORS:20180820-152626452

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[img] MS Excel (Table S1. Microprobe analyses (wt.%) of representative plagioclase (Plg), olivine (Ol), amphibole (Amph), clinopyroxene (Cpx), Opaque (Opac) minerals in the volcanic rocks from the Kahrizak Mountains, north-central Iran) - Supplemental Material
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[img] MS Excel (Table S2. Major and trace element contents of volcanic rocks from the Kahrizak Mountains, north-central Iran) - Supplemental Material
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Abstract

The Eocene volcanic rocks from the Kahrizak Mountains in north-central Iran are part of the Urumieh-Dokhtar magmatic arc, which runs parallel to the Main Zagros Thrust segment of the Neo-Tethys suture. These volcanic rocks, similar to those from eastern Pontides and northern Anatolia, Turkey, were mainly produced during the Eocene magmatic flare-up associated with the Arabia-Eurasia convergence. The rock suite includes basalt, trachyandesite/andesite and trachydacite/rhyolite lavas and pyroclastic deposits that evolved compositionally from calc-alkalic to shoshonitic. Their normalized trace element concentration patterns are moderately enriched in light rare earth element and depleted in high field-strength elements (HFSE; e.g., Nb, Ta, Ti). They have narrow ranges of initial Pb isotopic ratios and ^(143)Nd/^(144)Nd_i, but highly variable ^(87)Sr/^(86)Sr_i. The new analyses indicate that the parental magmas of the volcanic rocks were derived from a mantle source that had been enriched by fluids released from a subducted oceanic slab. The fluids introduced significant amounts of large ion lithophile elements, but negligible HFSE to the source. The parental magmas underwent fractional crystallization and assimilation of upper crustal materials to produce the range of volcanic rocks. Integration of new analyses with regional data suggests that the Eocene volcanic rocks from north-central Iran, together with ~coeval volcanic rocks in eastern Pontides and northern Anatolia, were most probably derived from a lithospheric mantle source that had been previously metasomatized by fluids derived from a subducted slab before and during the Arabia-Eurasia collision.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.lithos.2018.08.018DOIArticle
Additional Information:© 2018 Published by Elsevier B.V. Received 1 April 2018, Accepted 15 August 2018, Available online 20 August 2018. Our deepest gratitude to Faramarz Tutti (deceased), who helped initiate this project and to C. MacIsaac, for his help in the analysis. Support for this work was provided by the University of Tehran, Iran, Iran National Science Foundation, Iran and the Caltech Tectonics Observatory. Some of the analyses were done by the lead author during her visit to SIO, UCSD. We also want to thank the two anonymous reviewers for their extremely helpful comments and suggestions, and to A. Kerr for his excellent editorial handling.
Group:Caltech Tectonics Observatory
Funders:
Funding AgencyGrant Number
University of TehranUNSPECIFIED
Iran National Science FoundationUNSPECIFIED
Caltech Tectonics ObservatoryUNSPECIFIED
Subject Keywords:Iran; Urumieh-Dokhtar zone; Kahrizak geochemistry; Eocene magmatic flare-up; lithospheric mantle
Record Number:CaltechAUTHORS:20180820-152626452
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180820-152626452
Official Citation:Sima Yazdani, Paterno R. Castillo, Jamshid Hassanzadeh, Crust-mantle interaction inferred from the petrology and Sr-Nd-Pb isotope geochemistry of Eocene arc lavas from the Kahrizak Mountains, north-central Iran, Lithos, Volumes 318–319, 2018, Pages 299-313, ISSN 0024-4937, https://doi.org/10.1016/j.lithos.2018.08.018. (http://www.sciencedirect.com/science/article/pii/S0024493718302974)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88956
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:20 Aug 2018 23:36
Last Modified:30 Aug 2018 23:46

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