Esna-Ashari, Amir and Hassanzadeh, Jamshid and Valizadeh, Mohammed-Vali (2011) Geochemistry of microgranular enclaves in Aligoodarz Jurassic arc pluton, western Iran: implications for enclave generation by rapid crystallization of cogenetic granitoid magma. Mineralogy and Petrology, 101 (3-4). pp. 195-216. ISSN 0930-0708 http://resolver.caltech.edu/CaltechAUTHORS:20110610-094754991
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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.
|Additional Information:||© 2011 Springer-Verlag. Received: 24 August 2010; Accepted: 29 March 2011; Published online: 13 April 2011. 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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|Deposited By:||Jason Perez|
|Deposited On:||13 Jun 2011 15:15|
|Last Modified:||13 Jun 2011 15:15|
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