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

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

Content Provider	Semantic Scholar
Author	Esna-Ashari, Amir Hassanzadeh, Jamshid Valizadeh, Mohammad-Vali
Copyright Year	2011
Abstract	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 inmagmamixing, 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.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://tectonics.caltech.edu/publications/pdf/Ashar_MP2011.pdf
Language	English
Access Restriction	Open
Subject Keyword	Computer cooling Cool - action Crystallization Data compression Diagram Dietary Iron Electroencephalography Epoxyeicosatrienoic Acid Field electron emission Fragmentation (computing) Inference Instability Iron Köppen climate classification LibreOffice Calc Liquid substance Magma Microgranular Acute Promyelocytic Leukemia Mixing (mathematics) National origin Network enclave Nitrogen Oxides Oxides Plant Roots Resorption Walls of a building biotite granodiorite
Content Type	Text
Resource Type	Article

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