jmg12039-sup-0001-AppendixS1.pdfapplication/PDF84KAppendix S1. A summary of Crawford's (2008) detailed explanation of the reaction and phase-assemblage history in garnet crystals of the Picuris Mountains like those examined in this study.
jmg12039-sup-0002-FigS1.epsimage/eps291KFigure S1. Schematic illustration of reaction history recorded by zoning in Picuris garnet (after Crawford, 2008). (a) Normal garnet growth begins according to a reaction approximated by chl + qtz = grt + H2O. (b) The garnet-forming reaction changes to one approximated by chl + ms + plg + qtz = grt + bt + H2O. Plagioclase breakdown raises Ca concentration in garnet; biotite production lowers Ti in garnet. Simultaneously, allanite breaks down to form monazite, which raises Y while lowering P in garnet. (c) Nucleation of apatite and xenotime accounts for decreases in Ca and Y, while maintaining P at low levels. (d) Xenotime becomes unstable and breaks down, raising Y and P in garnet. The Ti increase is likely related to changes in the stability of ilmenite and/or rutile. (e) Normal garnet growth resumes.

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