Abstract

Rhyolite from the Deh Salm area, Lut block, Iran, is a 10-km-long flow unit that crops out as a 6-m thick sub-horizontal sheet ( 25 km) crustal-derived 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 Deh-Salm rhyolite.

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