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Fig. 4 | Swiss Journal of Geosciences

Fig. 4

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

Fig. 4

Mineral chemistry of monazite and distributions of monazite Th–U–Pb chemical ages. a Monazite Y2O3 vs age. Note position of sample RZ29. b Monazite UO2 vs age. c Monazite LREE and HREE compositions in mole fractions, with only negligeable variations in sample RZ29. d Diagram XGdPO4 vs XYPO4, with compositions above the garnet (Grt) metamorphic mineral zone as defined by Pyle et al. (2001). Moles calculated according to Pyle et al. (2001). e Monazite compositions in reference to the cheralite substitution trend. Note different trends in sample RZ29 compared to the other samples. f Normalised REE variation pattern in metamorphic monazite from Stubai micaschists, with HREE fractionation expressed as GdN/YbN versus LREE fractionation expressed as GdN/YbN. Note REE fractionation in pegmatitic reference monazites Madmon and MonAST

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