Correlation of Neoproterozoic III sequences in the Avalon composite terrane of mainland Nova Scotia: tectonic implications

Abstract

Neoproterozoic III volcanic and sedimentary rocks in the Antigonish and Cobequid Highlands have very similar lithostratigraphy, depositional age, volcanic geochemistry, and structural and metamorphic histories. The stratigraphic record and the volcanic geochemistry indicate deposition in an ensialic volcanic arc rift. The Neoproterozoic III deformation is attributed to basin closure. The correlations between the Cobequid and Antigonish Highlands suggest that they form part of one Neoproterozoic III terrane and that Paleozoic fault movement was limited. -from Authors