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Geochemical constraints on the origin and tectonic setting of Chargar intrusions in the Alborz orogenic belt, NW Iran

  • Seyed Hedayatalah Mousavi Motlagh
  • Majid GhaderiEmail author
  • Mir Ali Asghar Mokhtari
  • Narges Yasami
Article
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Abstract

Chargar area is located in the southern border of Tarom subzone within the Alborz magmatic belt of NW Iran. Two types of intrusions, mainly present in the southern part of the area, have been identified. These bodies intruded into the Karaj Formation volcanic and volcaniclastic rocks. Type-I intrusions occur in the south and include two magmatic bodies: (a) Gabbro-pyroxene quartz monzodiorite-quartz monzodiorite and (b) quartz syenite. Type-II crops out in the west and has a gabbro – gabbro-diorite composition. Geochemically, Chargar intrusive rocks belong to the high-K calc-alkaline to shoshonitic series and are classified as I-type and metaluminous granitoids. These intrusive rocks show insignificant different distribution patterns of trace elements and REEs, but generally they are characterized by highly enriched large ion lithophile elements (e.g., K and Ba) and depleted Nb, similar to that of continental arc magmatism. Type-I intrusions and Type-II mafic intrusion were originated from mantle source with amphibole-bearing spinel peridotite composition. These intrusions formed in a continental arc to post-collisional tectonic setting.

Keywords

Geochemistry continental arc post-collision calc-alkaline magmatism Chargar Alborz 

Notes

Acknowledgements

This paper is a part of the first author’s PhD thesis at Tarbiat Modares University, Tehran, Iran. An anonymous reviewer is thanked for the constructive review of the manuscript. Dr Rajneesh Bhutani is appreciated for careful editorial handling of the manuscript.

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© Indian Academy of Sciences 2019

Authors and Affiliations

  1. 1.Department of Economic GeologyTarbiat Modares UniversityTehranIran
  2. 2.Department of Geology, Faculty of SciencesUniversity of ZanjanZanjanIran

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