Cathodoluminescence and Ti contents of wollastonite from Tadano, Fukushima Prefecture, Japan

Abstract

Wollastonite of variable cathodoluminescence (CL) intensity was found in a skarn xenolith from Tadano, Fukushima Prefecture, Japan. Electron microprobe analysis revealed bright-blue and faint-blue CL spots in crystals. Panchromatic CL images revealed that individual wollastonite grains often include bright and dark CL regions of bright- and faint-blue CL, respectively. The TiO₂ contents of bright CL regions (0.055-0.110 wt%) were higher than those of dark CL regions (<0.008-0.013 wt%). The blue CL intensity gradually increased from <0.008 to 0.102 wt% TiO₂, and that with 0.102 and 0.110 wt% TiO₂ was almost the same. The results indicated a positive correlation of Ti content with blue CL intensity.