Abstract
Rare-earth elements (REE)-bearing sector-zoned lawsonite was found in Sanbagawa pelitic schists in the Ise area of the eastern Kii Peninsula, central Japan. The pelitic schists consist mainly of lawsonite, chlorite, phengite, titanite, albite, quartz, calcite and weakly-ordered graphite. Metamorphic conditions are estimated at P = 3-8 kbar and T 2 O 3 up to 0.55, Ce 2 O 3 up to 1.18, and Nd 2 O 3 up to 0.58 wt%) and depleted in Ca than the {010} and {001} sectors. The {001} sector is more enriched in Ti and depleted in Al than the {100} and {010} sectors. Compositional variations in lawsonite grains suggest (super [6]) REE (super [4]) AlCa (sub -1) Si (sub -1) and (super [6]) Ti (super [4]) Al(Al, Fe (super 3+) ) (sub -1) Si (sub -1) substitutions. Lawsonite can preferentially concentrate REE, and constitutes a most important REE reservoir at high P-T metamorphic conditions, at which epidote group minerals are unstable.
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