9:30 AM - 6:30 PM
[S2P-03] LILE mobility at each metamorphic stage recorded in the Sanbagawa metamorphic belt: Application of Protolith Reconstruction Model
[Presentation award entry]
Keywords:Fluid-rock interaction, Protolith reconstruction, Metamorphic rock, Subduction-related metamorphism
Elemental transfer during prograde and retrograde metamorphism was revealed for metabasaltic rocks of the Sanbagawa metamorphic belt. The elemental transfer was quantified by a novel “Protolith Reconstruction Model” that estimate protolith compositions by machine-learning algorithms trained with global basalt compositional datasets. The results indicate that prograde and retrograde metamorphisms caused systematic depletion and enrichment in Rb, Ba, K, and Sr, respectively.