U–Pb zircon geochronology and implications of Cambrian plutonism in the Ellsworth belt, Maine

The Ellsworth belt is one of several fault-bounded blocks exposed along the southeastern coast Maine that formed within Ganderia. New ID-TIMS U–Pb geochronological data integrated with field relationships provide additional insights into timing magmatism and deformation in belt. deformed Lamoine Granite was selected for zircon analysis to: (i) establish protolith age; (ii) direct temporal constraints on regional low-grade metamorphism deformation; (iii) elucidate between coeval rocks elsewhere Appalachian orogen. emplaced Schist at 492 ± 1.7 Ma; this first unequivocal evidence a Furongian magmatic event schistosity parallel to main fabric host provides maximum estimate metamorphic overprint. Widespread where kinematic indicators indicate top-to-northwest sense shear attributed thrusting during which progressive horizontal shortening, caused crustal thickening peak greenschist facies metamorphism. Cambrian age permits correlation Cameron Road Annidale Brunswick subduction-related magmas intruded Penobscot arc–back-arc were subsequently Orogeny.