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Arabian Journal of Geosciences

, Volume 4, Issue 7–8, pp 1207–1214 | Cite as

The origin of mafic rocks in the Naqadeh intrusive complex, Sanandaj-Sirjan Zone, NW Iran

  • Seyed Ali MazhariEmail author
  • Sadraldin Amini
  • Jalil Ghalamghash
  • Fernando Bea
Original paper

Abstract

The Naqadeh mafic plutonic rocks are located on a plutonic assemblage and include different granitoid rocks related to ∼40 Ma. U-Pb SHRIMP data shows different ages of 96 ± 2.3 Ma for mafic rocks. Naqadeh mafic plutonic rocks consist of diorite to diorite-gabbros with relatively high contents of incompatible elements, low Na2O, and \( {\hbox{Mg\# }} = \left[ {{\hbox{molar}}\;{100} \times {\hbox{MgO/}}\left( {{\hbox{MgO}} + {\hbox{FeO}}} \right)} \right] > 44.0 \). These features suggest that the Naqadeh mafic rocks originate from enriched lithospheric mantle above subducted slab during Neotethys subduction under Iranian plate.

Keywords

Iran Naqadeh Sanandaj-Sirjan Zone Pluton Mafic intrusive Mantle lithosphere 

أصل الصخور المافية فى معقدة ناقدة المتداخلة، نطاق سانانداج-سيرجان، شمال غرب إيران

تقع صخور ناقدة المافية البلوتونية فى تجمع بلوتونى يتضمن صخور جرانيتية مختلفة يرجع عمرها إلى 40 مليون سنة. دلت بيانات U-Pb SHRIMP إلى أعمار مختلفة (96 ± 2.3 مليون سنة) للصخور المافية. تتكون صخور ناقدة المافية البلوتونية من دايوريت – جابرو مع محتوى أكبر نسبيا من عناصر متضاربة و محتوى أقل منmolar 100*MgO/(MgO + FeO) > 44)) Na2O and Mg#. تبين هذه المعالم أن صخور ناقدة المافية نشأت من وشاح غنى فوق البلاطة أو اللوح الغاطس أثناء غطس النيوتيتش تحت اللوح الإيراني.

Notes

Acknowledgments

We are grateful to Pillar Montero and J. Molina in Granada University, Spain, for analytical support and valuable suggestion during research scholarship funded by the Iranian Ministry of Science and Technology.

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Copyright information

© Saudi Society for Geosciences 2010

Authors and Affiliations

  • Seyed Ali Mazhari
    • 1
    Email author
  • Sadraldin Amini
    • 2
  • Jalil Ghalamghash
    • 3
  • Fernando Bea
    • 4
  1. 1.Department of GeologyPayame Noor University (PNU)SabzevarIran
  2. 2.Department of GeologyTarbiat Moallem UniversityTehran,Iran
  3. 3.Department of PetrologyGeological Survey of IranTehranIran
  4. 4.Department of Mineralogy and PetrologyUniversity of GranadaGranadaSpain

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