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(A) Li (ppm) versus An (mol %) of plagioclase cores. Lithium content from Ito ignimbrite is much higher for a given An content than Osumi Pfa or any pre-AT units. (B) Whereas Osumi Pfa and pre-AT plagioclase Li content stays relatively constant to the rim (with a slight increase), those from the Ito ignimbrite have Li contents that start much higher and then decrease toward the rim with lower rim Li contents than other units.
