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0 kb and very few legacy data attempted to calculate pressures. These P-T arrays represent generalized metamorphic field gradients across a generalized greenstone belt from low-grade synform to high-grade margins near gneiss-granitoid domes, with the temperature axis being a proxy for the 'x length scale. 28 Metamorphic Evolution and Integrated Terrane Analysis of the Eastern Yilgarn Craton These groupings facilitate a discussion on the fundamental problems and critical issues that need to be addressed by metamorphic studies of the EYC.

These have similar 'P field gradients to the small-scale transpressional systems but differ by having hot orogen cores reflecting either the larger scale of the systems or slower rates of orogenesis. , 2006). Extrusion of high temperature/depth ratio rocks in the orogen core (reds-oranges) occurs between two crustal-scale shear zones with contrasting shear sense. The orogenic core is juxtaposed against the low temperature/depth ratio Barrovian (blues) external nappes by shallowly inclined extrusion at a high-angle to the orogenic front.

However, because both T and G also vary, this indicates that truly different metamorphic thermal regimes were developed across the EYC. Crucially, the high-P and low-P groupings do not share the same thermal regimes (G) and so cannot simply be different crustal levels of the same metamorphic event. Consequently, the currently exposed metamorphic patterns must be explained by one of the following mutually exclusive end-member processes (Figure 16). [1] Retrograde Metamorphic Patterns: Metamorphic patterns developed during retrograde evolution, or an unrelated reworking event, result from late-stage differential uplift and juxtaposition of metamorphically contrasted domains (Figure 16a).

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