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Peshtasar basalts: An example of post-collision basalts in sedimentary basin of Moghan, NW Iran

  • Abbasali Amraee
  • Reza ZareisahamiehEmail author
  • Mohsen Moayyed
  • Ahmad Ahmadikhalaji
  • Amirmorteza Azimzadeh
  • Jose Francisco Santos
Article
  • 23 Downloads

Abstract

With an east–west exposure trend, Peshtasar Complex, which is located in the sedimentary basin of Moghan, northwestern Iran, is lithologically varied. The main constituent minerals are plagioclase, clinopyroxene and iddingsitised olivine in basalts and plagioclase megacryst, clinopyroxene and leucite in tephrite. The studied rocks are plotted in the fields of basaltic trachy-andesite, trachy-andesite and tephri-phonolite in the total alkali-silica (TAS) diagram as well as high-K to calc-alkaline and shoshonite fields. The chondrite normalised pattern of rare earth elements indicates the enrichment of LILE and LREE as well as the depletion of HFSE and HREE. Nb and Ti have a negative anomaly in the spider diagram. Eu/Eu* represents a positive anomaly for Eu indicating the frequency of calcic plagioclase and low oxygen fugacity in rocks. Geochemical parameters and diagrams predict a magmatic evolution via assimilation – fractional crystallisation process. According to the Ce/Yb vs. Ce diagram, partial melting has happened within the garnet–lherzolite field in the depth of \({\sim }100\) km. Based on \(^{87}\)Sr/\(^{86}\)Sr, Shahyourdi samples have EM1 sources, whereas Germi and Tazehkand basalts have EM11 sources that are indicative of different mantle sources for basalts in the western Moghan of the central and eastern areas. Basalts are found in active continental margins associated with the post-collision arcs.

Keywords

Moghan basin Peshtasar basalt post-collision arc geochemistry isotopic analysis 

Notes

Acknowledgements

This work was conducted as a part of the PhD thesis of A Amraee. We also acknowledge the editor and the anonymous reviewers for their constructive comments which helped to improve this paper.

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Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  • Abbasali Amraee
    • 1
  • Reza Zareisahamieh
    • 1
    Email author
  • Mohsen Moayyed
    • 2
  • Ahmad Ahmadikhalaji
    • 1
  • Amirmorteza Azimzadeh
    • 3
  • Jose Francisco Santos
    • 4
  1. 1.Department of Geology, Faculty of SciencesLorestan UniversityKhorramabadIran
  2. 2.Department of Earth Sciences, Faculty of Natural SciencesUniversity of TabrizTabrizIran
  3. 3.Department of Geology, Faculty of SciencesZanjan UniversityZanjanIran
  4. 4.Geobiotec, Departamento de GeocienciasUniversidade de AveiroAveiroPortugal

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