The depth of magma fractionation in the oceanic mantle: Insights from garnet- bearing xenoliths from Oahu, Hawaii

Details The depth of magma fractionation in the oceanic mantle: Insights from garnet- bearing xenoliths from Oahu, Hawaii The depth of magma fractionation in the oceanic mantle: Insights from garnet- bearing xenoliths from Oahu, Hawaii

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3104611k&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 4, CiteID L04611

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Mineralogy And Petrology: Crystal Chemistry, Mineralogy And Petrology: Experimental Mineralogy And Petrology, Mineralogy And Petrology: Igneous Petrology, Mineralogy And Petrology: Major Element Composition

Scientific paper

A suite of garnet-bearing xenoliths that is dominantly composed of olivine, clinopyroxene, and garnet, from Oahu, Hawaii is discussed. All the minerals are in Mg# equilibrium with each other. High Fe/Mg of constituent minerals, high TiO2, Al2O3, Na2O of cpx, and low Cr-garnet preclude these xenoliths from being residues of partial melting. Combined petrography, mineral chemistry, and high-pressure liquidus phase equilibria indicate that these xenoliths are high pressure cumulates and originated as products of magma fractionation at a depth of >100 km, corresponding to the uppermost part of the asthenosphere. These depth constraints are about 15 km more than the seismically detected lithosphere-asthenosphere boundary. It is proposed here that the top of the asthenosphere beneath Oahu, Hawaii is a network of magma chambers where considerable amount of magma ponding and subsequent fractionation takes place.

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