The analyses of all or some of the rare-earth elements (Sc, Y, and the lanthanide series) have been used to understand petrologic processes at many scales ranging from planetary studies to studies of the Earth's crust (e.g., McLennan and Taylor 2012). Though thought to be insoluble or immobile at increased temperatures and pressures, the geochemical behavior of the rare earth elements (REE) have varied relative to each other in many subtle ways. Specific rare earth elements (Ce, Eu) have had distinct redox behaviors within crustal rocks. Their geochemical and mineralogic attributes have made them highly useful for many petrologic...

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