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Morphologies of primary rhyolitic melt inclusions in three successive populations of quartz phenocrysts in a single volcanic unit illustrate the change of inclusion shape after trapping. The 14 Ma Badlands lava flow on the Owyhee Plateau of southwestern Idaho contains two magmas with three distinct quartz populations differing in size and mor­phology. In tiny quartz crystals that nucleated shortly before the eruption, large melt inclusions retain their initial, irregular shapes, whereas the smallest inclusions show mature negative crystal shapes. Inclusions in a population of larger quartz crystals that nucleated earlier all show either negative crystal shapes or faceted shapes transitional to negative crystals. All inclusions in a third population of large corroded quartz crystals have mature negative crystal shapes regardless of inclusion size. In silicic magmatic systems, irregularly shaped inclusions in quartz may imply trapping just before eruption; analyses of such inclusions should have the greatest likelihood of revealing the magmatic volatile condi­tions driving the eruption.

Morphology and maturation of melt inclusions in quartz phenocrysts from the Badlands rhyolite lava flow, southwestern Idaho