Table 1 Results from automated SEM Mineral Liberation Analysis (MLA) of petrographic thin sections of monazite-bearing garnet micaschist samples from the Alpeiner Valley, Stubai region. Modal mineralogy of major phases, from XMOD point counting routine with ~ 10⁶ EDX analyses per thin section. Ca and Al bulk rock compositions in wt%, as calculated assay from modal mineralogy. Area, number of grains and grain size as MD50 (grain size at 50 wt% of cumulative grain size distribution) in µm for zircon (Zrn), monazite (Mnz) and xenotime (Xtm) from automated SEM Spare Phase Lineup (SPL) routine. The monazite grains are in contact with diverse other phases, as biotite (Bt), plagioclase (Pl), quartz (Qtz), apatite (Ap) and ilmenite (Ilm). These microstructural relationships are reported as ternary locking in %. Note high degree of ternary locking of monazite with allanite (Aln) and epidote (Epi) in sample RZ29 with corona structures

From: Electron microprobe petrochronology of monazite-bearing garnet micaschists in the Oetztal-Stubai Complex (Alpeiner Valley, Stubai)