Journal Title
Title of Journal: Miner Petrol
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Abbravation: Mineralogy and Petrology
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Publisher
Springer Vienna
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Authors: H Mirnejad G H Blourian M Kheirkhah M A Akrami F Tutti
Publish Date: 2008/07/22
Volume: 94, Issue: 3-4, Pages: 259-269
Abstract
Rhyolite from the Deh Salm area Lut block Iran is a 10kmlong flow unit that crops out as a 6m thick subhorizontal sheet 5° dip underlain by agglomerate and overlain by crystal lithic tuff The ryholite contains phenocrysts of garnet plagioclase and amphibole phases residing in a cryptocrystalline groundmass consisting of plagioclase Kfeldspar and quartz Euhedral garnet phases range in size from 02 to 30 mm have inclusions of ilmenite rutile apatite and zircon and show no reaction/resorption microtextures Electron microprobe analysis reveals that the garnet is homogeneous lacks substantial chemical zoning and is dominantly almandine with subordinate pyrope grossular spessartine and andradite The absence of inclusions of metamorphic minerals within garnet as well as the lack of included metamorphic rock fragments in the host rhyolite rule out a xenocrystic origin for the garnet The garnet phases have low CaO content and variable MnO concentration resembling those formed from Stype magma The host rhyolite contains quartz Kfeldspar and amphibole has normative corundum and is peraluminous Inclusions within garnet as well as the chemistry of the garnet and the host rhyolite suggest that the garnet is a phenocryst phase crystallized from a deeprooted 25 km crustalderived peraluminous magma It is likely that the peraluminous feature of the magma inherited from partial melting of metapelitic source rocks has favoured crystallization of garnet Upon rising to higher levels the garnet phases were in equilibrium with the host magma and thus were preserved as relatively large euhedral crystals in the DehSalm rhyoliteKeith Bell is thanked for reading an earlier version of this paper Help by Peter Jone for microprobe analysis is appreciated We would like to thank Kurt Stuewe and the two reviewers Eugenio Fazio and Tim Johnson whose comments added greatly to this manuscript This work was financially supported by the research council of the University of Tehran grant number 27838/1/10 to H Mirnejad
Keywords:
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