Tectonic influence on sedimentation along the southern flank of the late Paleozoic Magdalen basin in the Canadian Appalachians: Geochemical and isotopic constraints on the Horton Group in the St. Marys basin, Nova Scotia

摘要

The Late Devonian–Early Carboniferous St. Marys basin in mainland Nova Scotia, Canada, consists of Horton Group intracontinental clastic rocks that were deposited along the Avalon-Meguma terrane boundary during the waning stages of the Acadian orogeny and prior to terminal collision in the Appalachian orogen. These rocks represent the earliest stages of deposition along the southern flank of the composite Magdalen basin (Late Devonian to Permian) that extends over much of Maritime Canada and oversteps terrane boundaries in the Canadian Appalachians. As such, the Horton Group represents deposition in an episutural basin.