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Major-element variability in the Hawaiian mantle plume Erik H. Hauri
Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road NW, Washington DC 20015, USA
Isotope ratios and concentrations of silica, titanium, aluminium, calcium, sodium and iron are correlated in shield-stage basaltic lavas erupted over the past three million years from eight Hawaiian volcanoes. These correlations indicate the presence of a component beneath Hawaii with a bulk composition which is distinct from typical mantle peridotite. This material is most probably recycled oceanic crust distributed within the Hawaiian plume as segregations of quartz-bearing garnet pyroxenite or eclogite, which yield silica-rich (dacitic) magmas on partial melting.
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