Intermediate composition

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In igneous petrology an intermediate composition refers to the chemical composition of a rock that has 52-63 wt% SiO2 being an intermediate between felsic and mafic compositions. Typical intermediate rocks include andesite, dacite and trachyandesite among volcanic rocks and diorite and granodiorite among plutonic rocks.[1]

References[edit]

  1. ^ "Last "5" years paper". pakistan. Retrieved 25 May 2011.