Petrogenesis of the two phases of intrusive rocks at Chodarchay, NW Iran: using trace and rare earth elements

  • Narges Yasami
  • Majid GhaderiEmail author
  • Mir Ali Asghar Mokhtari
  • Seyed Hedayatalah Mousavi Motlagh
Original Paper


The Chodarchay area is located 50 km east of the city of Zanjan, within the Tarom-Hashtjin subzone, in the Western Alborz structural zone of NW Iran. Igneous rocks in the area include intrusive granitic (phases I and II), and volcanic rocks. Geochemical characteristics of the granitic rocks were determined using their trace and rare earth element (REE) compositions. The phase I intrusive rocks at Chodarchay include quartz monzonite and quartz syenite, while the phase II mainly consists of granite and alkali granite. These intrusive rocks have SiO2 contents ranging between 60.11 and 69.14 wt%, high K2O + Na2O (8.20 to 10.21 wt%) and K2O/Na2O ratios of 1.24 to 2.56. Petrological and geochemical studies indicate that the granitoids have high-K to shoshonitic affinity, they are metaluminous to mildly peraluminous and characterize as I-type granitoids. The investigated granitoids (phases I and II) have fractionated REE patterns characterized by enrichment in light REEs and varying degrees of depletion in heavy REEs. Large-ion lithophile element (LILE) enrichment, high-field strength element (HFSE) depletion, and distinct positive Pb anomaly in the primitive mantle-normalized trace element patterns of the rocks imply subduction-related arc magmatic signatures. It is suggested that the granites formed in a volcanic arc to post-collision setting from a garnet spinel lherzolite source.


Volcanic arc Shoshonitic rocks Granitoids Chodarchay Tarom 



This paper is a part of the first author’s Ph.D. thesis at Tarbiat Modares University, Tehran, Iran. Appreciation is extended to Madankaran Angouran Company for providing field survey facilities. We would like to thank Nematollah Rashidnejad-Omran and an anonymous reviewer for their constructive review on the manuscript. Abdullah Al-Amri and Yalcin Ersoy are also thanked for careful editorial handling of the manuscript.


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Copyright information

© Saudi Society for Geosciences 2018

Authors and Affiliations

  • Narges Yasami
    • 1
  • Majid Ghaderi
    • 1
    Email author
  • Mir Ali Asghar Mokhtari
    • 2
  • Seyed Hedayatalah Mousavi Motlagh
    • 1
  1. 1.Department of Economic GeologyTarbiat Modares UniversityTehranIran
  2. 2.Department of Geology, Faculty of SciencesUniversity of ZanjanZanjanIran

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