文摘
High-precision geochemical data for 53 Cascade Arc primitive magmas Calc-alkaline & tholeiitic groups (CABs, HAOTs) define common isotopic trends Isotopic end-members are MORB-type depleted background mantle and subducting sediment Additional oceanic crust input in CABs Intraplate basalts (Garibaldi Belt, Adams-Simcoe) tap isotopically distinct enriched mantle