Preliminary experimental determination of the partitioning of lithium between plagioclase crystals of different anorthite contents

► Rapid lithium diffusion in plagioclase allows subsolidus experiments to investigate Li-partitioning. ► Experimental data show that lithium partitioning into plagioclase depends strong on plagioclase An content. ► Application of experimental data to natural samples suggests processes operating on volcanic eruption timescales can be traced using Li in plagioclase.