Describe how you would expect the petrographic characteristics of the rock to change from the edge of the core complex to the core.

A geological campaign has mapped an exposed metamorphic core complex from an old exposed orogenic belt. The core complex is formed from a unit of shales present as un-metamorphosed protolith up to a peak metamorphic condition of P = 8 kbar, T = 700°C. Describe how you would expect the petrographic characteristics of the rock to change from the edge of the core complex to the core. Draw annotated diagrams to support your answer.