Introduction: LEW2 consists of abundant, coarse subhedral to euhedral olivine crystals (-FOG()90, typical grainsize -0.5mm) set in a fine-grained intergranular groundmass composed primarily of plagioclase, olivine, and Ca-A1 pyroxene [eg. 1,2]. The groundmass clearly represents a crystallized melt [3,4]. McKay et al. [6] proposed that this interstitial groundmass melt was produced by fractional...