Minor and Rare Earth Element Geochemistry of K-Rich Silica-Undersaturated Igneous Rocks
The silica–undersaturated K-rich igneous rocks are highly enriched in the lighter REE. Their La abundance for example, is often 1,000–1,400 times greater than that of chondrites (Mitchell et al. 1987). Abundance of the heavy REE is not as high, but still 6–20 times that of chondrites.