Mantle plumes, such as the one responsible for generating the Hawaiian Archipelago, represent a rare opportunity to indirectly sample the Earth's mantle. Geochemical studies of ocean island basalts (OIB) show that the mantle is chemically and isotopically heterogeneous at scales ranging from millimeters to thousands of kilometers (Hofmann, 2003). Volcanoes in the Hawaiian Islands are distributed along two subparallel geographical trends that are geochemically distinct (

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