Presentation Information
[S2P-03]LILE mobility at each metamorphic stage recorded in the Sanbagawa metamorphic belt: Application of Protolith Reconstruction Model[Presentation award entry]
*Satoshi Matsuno1, Masaoki Uno1, Atsushi Okamoto1, Noriyoshi Tsuchiya1 (1. Tohoku Univ. Env.)
Keywords:
Fluid-rock interaction,Protolith reconstruction,Metamorphic rock,Subduction-related metamorphism
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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.
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.