Pressure-temperature-time path for gneisses from the Teton Range. M1 and M2 are recorded only in the northern Tetons. The M1 high-pressure granulite event was dated at 2695 Ma and determined by garnet-rutile-aluminosilicate-ilmenite-quartz (GRAIL) barometry and Zr-in-rutile thermometry to have occurred at >12 kbar and a minimum of 900 °C. The M2 event is marked by partial melting of Layered Gneiss in the presence of staurolite at 2685 Ma. M3 is recorded in garnet amphibolites from the northern portion of the range. It is interpreted as an amphibolite-facies metamorphic event accompanying accretion of the northern and southern domains of the Teton Range along the Moran deformation zone at ca. 2.62 Ga. Ky—kyanite, Sil—sillimanite, And—andesite.
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