Timing and origin of magmatism in the Sverdrup Basin, Northern Canada-Implications for lithospheric evolution in the High Arctic Large Igneous Province (HALIP)

We suggest that the early 128-120 Ma tholeiitic event is primarily plume-generated and correlates across the circum-Arctic with the other HALIP tholeiites. The younger magmatism, with coeval alkalic and tholeiitic magmas erupting over 25 Myr, is likely not plume-generated and may be explained by alternating modes of edge-driven mantle convection as the primary control on magma genesis. A distal plume would intensify magma production by edge-driven convection, but its influence would be secondary.