Figure F15. Isotopic variability along the Hawaiian-Emperor volcanic lineament (after Keller et al., 2004, and Frey et al., 2005). Hf isotopic compositions indicate a persistent depleted component intrinsic to the plume. He isotopic data are uniformly elevated relative to MORB but decrease toward MORB values from Suiko to Detroit Seamounts. Sr isotopic values show a progressive increase southward through the Emperor Seamounts, which is interpreted as decreasing partial mantle melting. No correlations are apparent between isotopic and magmatic volume variations (bottom panel).

Figure F15. Isotopic variability along the Hawaiian-Emperor volcanic lineament (after Keller et al., 2004, and Frey et al., 2005). Hf isotopic compositions indicate a persistent depleted component intrinsic to the plume. He isotopic data are uniformly elevated relative to MORB but decrease toward MORB values from Suiko to Detroit Seamounts. Sr isotopic values show a progressive increase southward through the Emperor Seamounts, which is interpreted as decreasing partial mantle melting. No correlations are apparent between isotopic and magmatic volume variations (bottom panel).