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Geochemistry and Sr–Nd isotopic characteristics of ferroan-magnesian metaluminous granites of the NW Sanandaj–Sirjan zone, Iran: granite formation in a compressional–extensional setting during Late Jurassic time

Published online by Cambridge University Press:  03 April 2023

Majid Shirmohammadi ,
Ali Asghar Sepahi Open the ORCID record for Ali Asghar Sepahi [Opens in a new window] ,
José Francisco Santos Open the ORCID record for José Francisco Santos [Opens in a new window] ,
Mohammad Maanijou ,
Ashraf Torkian  and
Hamed Vahidpour
Majid Shirmohammadi
Affiliation:
Department of Geology, Bu-Ali Sina University, Hamedan, Iran
Ali Asghar Sepahi*
Affiliation:
Department of Geology, Bu-Ali Sina University, Hamedan, Iran
José Francisco Santos
Affiliation:
Department of Geosciences, Geobiotec Research Unit, Aveiro University, Aveiro, Portugal
Mohammad Maanijou
Affiliation:
Department of Geology, Bu-Ali Sina University, Hamedan, Iran
Ashraf Torkian
Affiliation:
Department of Geology, Bu-Ali Sina University, Hamedan, Iran
Hamed Vahidpour
Affiliation:
Department of Geology, Bu-Ali Sina University, Hamedan, Iran
*
Author for correspondence: Ali A. Sepahi, Emails: aasepahi@gmail.com, sepahi@basu.ac.ir
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Abstract

The Almogholagh–Dehgolan region is in the North Sanandaj–Sirjan zone of NW Iran. The granites of the region are metaluminous and display geochemical and textural characteristics of transitional granites between ferroan (A-type) and I-type granites. In geotectonic discrimination diagrams, the Almogholagh–Dehgolan granites plot mainly in the fields of within-plate granites and volcanic arc granites. With the exception of the Qalaylan granites, parts of other granites resemble A2-type granites. Granites of the Qalaylan intrusive body have petrographic and geochemical features close to I-type granites and are not A-type. Primary mantle and chondrite-normalized spider diagrams show enrichments in light rare earth elements relative to heavy rare earth elements. For an age of 150 Ma, the initial 87Sr/86Sr and 143Nd/144Nd ratios vary from 0.702769 to 0.706545 and from 0.512431 to 0.512558, respectively. Epsilon Nd values vary in a relatively limited range between −0.3 and +2.2, which corresponds to a mixed mantle–crustal source. On the basis of new geochemical and isotopic data, we suggest a geodynamic model involving partial melting of lower crustal rocks with the contribution of mantle magmas in a weakly extensional tectonic setting for the generation of the A-type granites of the region. The occurrence of ferroan (A-type) granites in this region of the Sanandaj–Sirjan zone indicates the existence of a partly extensional tectonic environment in a mainly compressional subduction-related regime in Late Jurassic time.

Keywords

A-type granitesAlmogholagh–Dehgolanferroanweakly extensional regimeSanandaj–Sirjan zone
Type
Original Article
Information
Geological Magazine , Volume 160 , Issue 6 , June 2023 , pp. 1065 - 1089
Copyright
© The Author(s), 2023. Published by Cambridge University Press

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Footnotes

*

Present address: Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Iran

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