Fig. 4. CL images of quartz crystals with variable growth/dissolution textures.

Brighter regions have higher Ti content. (A) Osumi (crystal-rich) quartz has partially dissolved rim (truncated zones). (B) Osumi (crystal-poor) quartz has highly dissolved/embayed rim. (C) Arasaki-3 quartz has highly resorbed rim and has a much higher zircon saturation temperatures than lower Fukaminato (D), which tend to have euhedral rims and interior. (E and F) Clearly resorbed cores from Iwato and Kenashino quartz grains. The Fukaminato quartz in (G) shows nearly constant oscillatory zoning. (H) Skeletal growth in quartz from lower Fukaminato. White arrows in the bottom right of all images are 200 μm.