Evidence for Post-Acadian Through Alleghanian Deformation in Eastern Maine: Multiple Brittle Reactivation of the Norumbega Fault System‪.‬

ABSTRACT Detailed mapping in eastern and east-central Maine reveals a complex history of multiple brittle reactivations along the Norumbega fault system (NFS) following initial late Acadian (380 Ma) ductile shearing. Three distinct episodes of brittle faulting are now recognized, each characterized by a unique combination of fault kinematics and dynamics. These three events record a previously poorly-known part of northern Appalachian history -- the transition from Acadian stress regimes related to one set of plate collisions to Alleghanian stresses associated with very different plate interactions.