Komatiites and picrites: Evidence that the 'plume' source is depleted

Details Komatiites and picrites: Evidence that the 'plume' source is depleted Komatiites and picrites: Evidence that the 'plume' source is depleted

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.128..303a&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 128, no. 3-4, p. 303-311

Physics

10

Earth Mantle, High Temperature, Lithology, Magma, Plumes, Basalt, Geochemistry, Ocean Temperature

Scientific paper

High-temperature magmas such as picrites and komatiites are candidates for the material in the hot axial region of mantle plumes. In current plume theories these magmas should have an enriched ocean-island basalt (OIB) type chemistry. High MgO magmas, however, are often more like depleted mid-ocean ridge basalts (MORB) in trace element and isotopic chemistry. This a paradox for deep mantle plume, or primitive mantle, theories but is expected if hotspots and MORB share a common depleted source and the transition to OIB chemistry involves shallow-level cooling, crystal fractionation and contamination. Ancient komatiies appear to have come from the same deep depleted reservoir as modern picrites and MORB.

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