The Tasmantid Seamounts - Shallow melting and contamination of an EM1 mantle plume

Details The Tasmantid Seamounts - Shallow melting and contamination of an EM1 mantle plume The Tasmantid Seamounts - Shallow melting and contamination of an EM1 mantle plume

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.107..448e&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 107, no. 3-4, Dec. 1991, p. 448-462. Research supported by Australian

Computer Science

3

Earth Mantle, Free Convection, Magma, Petrology, Seamounts, Basalt, Garnets, Geochemistry, Mineralogy, Petrography, Rare Earth Elements, Trace Elements

Scientific paper

An integrated approach combining experimental, trace-element, and isotopic data is used to evaluate the petrogenesis of the Tasmantid Seamounts. Primary melt composition estimates are employed to constrain depths of magma generation and the nature of the mantle source residue. Geochemical and isotopic systematics indicate mixing involving two dominant and distinct mantle sources, which give rise separately to alkaline and tholeiitic magma compositions. The alkali-olivine basalts have trace element characteristics similar to 'average' OIB, and are interpreted to reflect relatively deep garnet-present melting of the geochemically depleted upper mantle, or the possible melting of the oceanic lithosphere which has been enriched in incompatible elements by small garnet-equilibrated melt fractions derived from the underlying asthenosphere. The tholeiitic basalts have geochemical and isotopic characteristics matching those of EM1 OIB, including unusually high Ba/Nb values and Sr and Nd isotope ratios which plot below the mantle array.

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