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      https://www.ias.ac.in/article/fulltext/jess/128/08/0224

    • Keywords

       

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

    • 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.

    • Author Affiliations

       

      SEYED HEDAYATALAH MOUSAVI MOTLAGH1 MAJID GHADERI1 MIR ALI ASGHAR MOKHTARI2 NARGES YASAMI1

      1. Department of Economic Geology, Tarbiat Modares University, Tehran 14115-175, Iran.
      2. Department of Geology, Faculty of Sciences, University of Zanjan, Zanjan 45195-313, Iran.
    • Dates

       
  • Journal of Earth System Science | News

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