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By B. Goscombe 1 , R.S. Blewett , K. Czarnota , P.B. Groenewald and R. Maas .

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A) Instantaneous thermal gradient at a point, the actual thermal gradient through the crustal profile at a given instant in time and the temperature/depth ratio (G - ºC/km). (b) Metamorphic field gradients. Where there is spatial variation in metamorphic conditions, metamorphic field gradients can be used to extract further tectonic information that is otherwise not available (Goscombe and Gray, 2009). By documenting the metamorphic heterogeneity of an orogenic system, field gradients are indicators of different crustal levels and metamorphic partitioning, which is typically also related to structural patterns.

Same G in different blocks) where the different conditions merely reflect different crustal levels with the same thermal regimes. 34 Metamorphic Evolution and Integrated Terrane Analysis of the Eastern Yilgarn Craton Figure 20: Definition of different metamorphic gradients. (a) Instantaneous thermal gradient at a point, the actual thermal gradient through the crustal profile at a given instant in time and the temperature/depth ratio (G - ºC/km). (b) Metamorphic field gradients. Where there is spatial variation in metamorphic conditions, metamorphic field gradients can be used to extract further tectonic information that is otherwise not available (Goscombe and Gray, 2009).

High-Ca magmatism in the Kurnalpi peaks immediately before termination of volcanism and together all terranes document a general decrease in age towards the east. The second phase of High-Ca granite has higher Y-contents indicating no garnet in the restite and shallower melting. This is interpreted to indicate cessation of subducted slab melting and the shallower melting zone may have involved a higher crustal melt component. The two peaks in the High-Ca granite bloom, immediately before and immediately after termination of volcanism, probably signify a major switch in tectonic setting.

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