Water and partial melting in mantle plumes: Inferences from the dissolved H2O concentrations of Hawaiian basaltic magmas

Details Water and partial melting in mantle plumes: Inferences from the dissolved H2O concentrations of Hawaiian basaltic magmas Water and partial melting in mantle plumes: Inferences from the dissolved H2O concentrations of Hawaiian basaltic magmas

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.3639w&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 19, p. 3639-3642

Physics

13

Geochemistry: Composition Of The Mantle, Mineralogy And Petrology: Igneous Petrology, Mineralogy And Petrology: Minor And Trace Element Composition

Scientific paper

Knowledge of dissolved H2O in primary Kilauean magmas provides a constraint on H2O abundance in the deep mantle region that feeds the upwelling plume beneath Hawaii. Given an H2O/K2O mass ratio of ~1.3 for basaltic glasses and melt inclusions from Kilauea, the mantle source is estimated to contain 450+/-190ppm H2O. This value is ~3 times greater than that estimated for the mantle source for mid-ocean ridge basalts. Consideration of OH solubility in olivine suggests that water undersaturated melting of the upwelling Hawaiian plume probably begins at a depth of ~250 km. Thus during plume ascent through most of the upper mantle, water is partitioned between nominally anhydrous silicates and a small mass fraction of entrained hydrous silicate melt. Because water strongly influences the viscosity of olivine aggregates, partial melting and melt extraction will have important effects on the rheology of the upwelling plume beneath Hawaii.

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