Corrigendum to “Neoproterozoic-Early Devonian Magmatism in the Antigonish Highlands, Avalon terrane, Nova Scotia: Tracking the evolution of the mantle and crustal sources during the evolution of the Rheic Ocean” [Tectonophysics 461 (2008)181–201

Abstract

Continental rift-related magmatism in the Antigonish Highlands occurs in the Late Neoproterozoic, Lower Cambrian, Middle Ordovician and Late Devonian in awide variety of regional tectonic settings (Fig. 23). Late Neoproterozoic rift-related magmatism, represented by the Clydesdale Formation, occurs in an intra-arc environment and is coeval with calc alkalic felsic and mafic magmas in the Antigonish Highlands (Fig. 4). This magmatism is a local representative of regional Andean-style arc magmatism that characterizes the Late Neoproterozoic evolution of the northern Gondwanan margin (Murphy and Nance, 1989, 2002; Nance et al., 2002; Keppie et al., 2003). Early Cambrian magmatism (Arbuckle Brook Formation) occurs in a local pull-apart basin and was associated with the development of San Andreas-style transform faulting along the northern Gondwanan margin (Murphy et al., 1999, Nance et al., 2002; Keppie et al., 2003). By 460 Ma, Avalonia was a microcontinent and the Dunn Point and Bears Brook formations were formed within an ensialic island arc environment. Avalonia accreted to Baltica by the Early Silurian and to Laurentia by the middle Silurian (Murphy et al., 1996b). The Late Devonian McArras Brook Formationwas deposited either after, or during thewaning stages of, the Acadian orogeny and reflects post-accretionary strike-slip tectonics along the Laurentianmargin. Late Neoproterozoic to Middle Ordovician magmatism is bimodal, whereas the Late Devonian magmatism is predominantly mafic in composition.