Nd isotope mapping of Grenvillian crustal terranes in the vicinity of the Manicouagan Impact Structure

Over 70 new Nd isotope analyses are presented for the Manicouagan area of the Grenville Province to estimate the crustal age of target rocks involved in the 214Ma Manicouagan Impact Structure, and to reconstruct the Precambrian geological evolution of this crustal segment. The rocks fall into two main groups: Samples from the Archean-aged Gagnon Terrane to the north and west of the impact give TDM ages averaging 2.70Ga. Samples from the …