Abstract
The Proterozoic continental tholeiites of Natkusiak province (723 Ma old) of the northwestern Canadian Shield are part of the Franklin magmatic event. They resemble Phanerozoic flood basalts in their incompatible trace-element and SrNdPb isotopic variations as well as in their large volumes, and a relatively short period of eruption. The wide variations in SrNdPb isotopic and incompatible trace-element ratios (e.g., initial ϵ Nd=−5.6 to + 5.7) in the Natkusiak basalts, together with the correlations between the isotopic and trace-element ratios, imply the involvement of a crustal component in their genesis. The Natkusiak basalts are inferred to be derived from the subcontinental upper mantle and contaminated by Precambrian basement during their ascent.
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