Mineralogy and Petrology

, 101:195 | Cite as

Geochemistry of microgranular enclaves in Aligoodarz Jurassic arc pluton, western Iran: implications for enclave generation by rapid crystallization of cogenetic granitoid magma

  • Amir Esna-Ashari
  • Jamshid Hassanzadeh
  • Mohammad-Vali Valizadeh
Original Paper


Microgranular enclaves are common in the Jurassic Aligoodarz granitoids of western Iran. Enclaves Enclosed in Granodiorite (EEG) and Enclaves Enclosed in Tonalite (EET) are different but they overlap their hosts on variation diagrams. The EEG is compositionally intermediate between tonalite and granodiorite. Mixing between tonalitic and granodioritic magmas and fractional crystallization are two models examined as the origin of the EEG. Field, textural, mineralogical and chemical observations suggest that chemical equilibration, common in magma mixing, was not attained between the EEG and its host. This, together with other observations does not support magma mixing as a mechanism for forming the EEG. Alternatively, excessive nucleation of biotite ± Fe-Ti-oxides ± amphibole by rapid cooling at borders of a shallow magma chamber and later fragmentation and dispersal by dynamic arc plutonism best explains the EEG. However, channeling of a new magma into the nearly solid tonalitic host explains formation of the EET.


Host Rock Tourmaline Magma Chamber Fractional Crystallization Plagioclase Phenocryst 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



Constructive criticisms from Teodosio Donaire, Finger Fritz and Georg Hoinkes have helped to improve the manuscript. Riccardo Vannucci from University of Pavia, Italy is also acknowledged for his helps. Support for this work was provided by the Iran National Science Foundation (INSF), Grant no. 87020210, and Tectonics Observatory of California Institute of Technology, USA.


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© Springer-Verlag 2011

Authors and Affiliations

  • Amir Esna-Ashari
    • 1
  • Jamshid Hassanzadeh
    • 2
  • Mohammad-Vali Valizadeh
    • 1
  1. 1.School of Geology, College of ScienceUniversity of TehranTehranIran
  2. 2.Tectonics Observatory, Division of Geological and Planetary SciencesCalifornia Institute of TechnologyPasadenaUSA

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