Melt inclusion formation during olivine recrystallization: Evidence from stable isotopes

Melt inclusions are often used to infer melting processes or determine source magmas that usually overprinted in bulk rocks due late stage mixing near surface contamination. Here we present the first investigation of oxygen (O) isotope equilibrium between melt and their host olivines from arc samples. Olivines all but one sample record either magma fractional crystallization. All six Vulcano, 83% seven Sukumoyama, 44% 21 St Vincent, 37% four Iwate, 21% 13 Aoba not isotopic with olivine host, despite other major elements being apparent equilibrium. A detailed study some shows only a small volume around is its host. This strongly suggests these trapped partly recrystallized olivines, highlighting importance crystal recycling magmatic plumbing system volcanoes. Oxygen fractionation as well phosphorus- δ 18 O systematics, could be better understand formation history. It also provide valuable information help characterize hosts formed (e.g., rich-mush versus poor lenses). • dissolved then olivines. few rare low data melts. large proportion Δ Ol-MI show local disequilibrium. Coupling phosphorus reveals histories systems.