Figure 7. A. Chondrite-normalized REE patterns for rhyolites A and B at the Fetais deposit. These units have similar REE patterns, suggesting that the felsic magma types are derived from a common source. Vertical shifts in the REE pattern of a given rhyolite types are due to alteration-related mass changes. The near-parallelism of the altered and unaltered samples indicates that the REE were largely immobile during alteration, although minor mobility in the light REE can be detected.