Evolution of Pre-Carboniferous Tectonostratigraphic Zones in the New Brunswick Appalachians

Abstract

New Brunswick is divided into five tectonostratigraphic zones based upon Cambrian-Ordovician and to a lesser extent Upper Precambrian lithofacies. Sub-zones are distinguished by the characteristics of overlying pre-Carboniferous strata, and tectonic styles. The paleogeography and tectonic evolution of these zones can be related to the development of two oceanic basins, which transgressed onto the adjacent disrupted continental crust. Opening of the northern oceanic basin began during the Cambrian and closing was completed during late Ordovician time. The southern basin was initiated during the late Precambrian or Cambrian, and closed during the Silurian to early Devonian.