Abstract

The Meguma Zone of southern Nova Scotia consists mainly of Cambrian-Ordovician flyschoid metasedimentary rocks and Devonian-Carboniferous peraluminous granitic intrusions. It does not correlate with other lithotectonic zones in the Appalachians and may be a suspect terrane. Studies of the flyschoid rocks suggest that their source lay to the southeast, and a sedimentological case has been made for Morocco as the source region. This study uses discriminant function analysis on whole-rock geochemical data from the granites to test the correlation between Morocco and Iberia. To eliminate the problem of closure, a log ratio transformation is applied to the major-element data, and to approximate normal distributions, a log transformation is applied to the trace-element data. Statistical models show broad geochemical similarities between the peraluminous granites of Nova Scotia, northern Morocco, and Iberia. In particular, several plutons in both Nova Scotia (Sherbrooke, Ellison Lake, Moose Lake) and Morocco (Zaer, Ment, Sebt de Brikiine) are strongly misclassified as Moroccan and Nova Scotian, respectively. Also, a comparison between these North Atlantic peraluminous granites as a group, and a control suite from Australia, shows the differences between the two populations to be considerably larger than the differences between Nova Scotia, Morocco, and Iberia. Peraluminous granites appear to have distinctive geochemical signatures on an orogenic scale.

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