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In this study, we report the occurrence of zircon coronae textures in\udmetapelitic granulites of the Ivrea–Verbano Zone. Unusual zircon textures\udare spatially associated with Fe–Ti oxides and occur as\ud(1) vermicular-shaped aggregates 50–200 µm long and\ud5–20 µm thick and as (2) zircon coronae and fine-grained chains,\udhundreds of micrometers long and ≤ 1 µm thick, spatially\udassociated with the larger zircon grains. Formation of such textures is a\udresult of zircon precipitation during cooling after peak metamorphic\udconditions, which involved: (1) decomposition of Zr-rich ilmenite to\udZr-bearing rutile, and formation of the vermicular-shaped zircon during\udretrograde metamorphism and hydration; and (2) recrystallization of\udZr-bearing rutile to Zr-depleted rutile intergrown with quartz, and\udprecipitation of the submicron-thick zircon coronae during further exhumation\udand cooling. We also observed hat-shaped grains that are composed of\udpreexisting zircon overgrown by zircon coronae during stage (2). Formation of\udvermicular zircon (1) preceded ductile and brittle deformation of the host\udrock, as vermicular zircon is found both plastically and cataclastically\uddeformed. Formation of thin zircon coronae (2) was coeval with, or\udimmediately after, brittle deformation as coronae are found to fill fractures\udin the host rock. The latter is evidence of local, fluid-aided mobility of\udZr. This study demonstrates that metamorphic zircon can nucleate and grow as\uda result of hydration reactions and mineral breakdown during cooling after\udgranulite-facies metamorphism. Zircon coronae textures indicate metamorphic\udreactions in the host rock and establish the direction of the reaction front

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Interpretation of zircon coronae textures from metapelitic granulites of the Ivrea–Verbano Zone, northern Italy: two-stage decomposition of Fe–Ti oxides