Ti Ferriallanite-(Ce), Ti and Ti–V Allanite-(Ce), Allanite-(Ce), Allanite-(Y), and REE Epidote in Biotite-Bearing Quartz Gabbroids and Plagiogranitoids within the Island-Arc Pervomaysk-Ayudag Complex of the Mountain Crimea
Journal: Geochemistry International
Year: 2025

The unique association of the epidote-group REE minerals, as well as the evolution of lanthanides and actinides, titanium and vanadium in their composition are described. Allanite-(Ce), often with a ferriallanite-(Ce) core, allanite-(Y) in an outer zone, and a rim of REE epidote forms pseudomorphs after chevkinite-(Ce) and perrierite-(Ce), as well as isolated crystals. They form intergrowths with biotite and are developed near it in quartz gabbronorite-dolerites and gabbronorite-diorites of the