Early deformation in the Caledonian-Appalachian orogen

Abstract

Summary Deformation isotopically dated at 1100–1000 Ma has been recorded in the Moine rocks of N Scotland and may be related to the latest stages of Grenville orogenesis of N America. Late Precambrian orogenesis is widely recorded in the dispersed fragments of Avalonia particularly in the eastern Appalachians, eastern Newfoundland and southern Britain. Localized evidence for late Cambrian-early Ordovician orogenesis is forthcoming in the Appalachians (Penobscot) in Scandinavia (Finnmarkian) and in Scotland and Ireland (Grampian).

Tectonostratigraphie du carbonifère de la Gaspésie Québec Canada

“…Ma (Keppie, 1985;Rast et al, 1988), avant même que la partie sud de Iapétus ne soit ouverte en tant que bassin marin, selon les données de Fichter et Diecchio (1986 (De Broucker, 1987). Ces déformations furent d'abord attribuées à " l'orogenèse Gaspésienne " (Ayrton, 1967), un terme maintenant abandonné.…”

Siluro-Devonian palaeomagnetism, terrane emplacement and rotation in the Caledonides of western Ireland

“…The Dalradian Supergroup was influenced by Grarnpian orogenesis in both Scotland and Ireland (Lambert & McKerrow 1976) constrained by critical radiometric determinations to the interval 514-491 Ma (Rast, Sturt & Harris 1988). No close correlatives of the Dalradian are found in Newfoundland, although it is believed to correspond in part to the Fleur de Lys Group (Kennedy 1979).…”