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Late Neoproterozoic Extension‐Related Magma Emplacement in the Central Appalachians: An Example From the Polly Wright Cove Pluton

The late Neoproterozoic (706 ± 4 Ma) Polly Wright Cove pluton is an elliptical intrusive body composed predominantly of biotite granite that intruded Grenville‐age granitoid crust in the central Virginia Blue Ridge province. Fine‐and medium‐grained biotite granite occurs as multiple tabular sheets near the pluton margins and as finger‐like projections that extend into the country rock. The pronounced sheeting is absent from the pluton interior where medium‐grained biotite granite and a younger biotite leucogranite are massive. Structural elements in and adjacent to the pluton are generally parallel. High‐strain zones in the country rock and pluton record SE‐directed extensional deformation. Country rock fabrics and internal pluton structures appear to be contemporaneous, suggesting that the Polly Wright Cove pluton was emplaced syntectonically into actively extending country rock during the early stages of late Neoproterozoic rifting of Laurentia. Emplacement began with the intrusion of sheeted dikes and was followed by minor late‐stage expansion of the pluton interior. Detailed microstructural analysis, as illustrated by this study, has the potential to aid significantly in the interpretation of the tectonic aspects of magmatism.