Mantle plumes and entrainment - Isotopic evidence

Details Mantle plumes and entrainment - Isotopic evidence Mantle plumes and entrainment - Isotopic evidence

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sci...256..517h&link_type=abstract

Science (ISSN 0036-8075), vol. 256, no. 5056, April 24, 1992, p. 517-520.

Computer Science

177

Basalt, Earth Mantle, Entrainment, Isotopic Enrichment, Plumes, Geochronology, Ocean Bottom, Radioactive Age Determination, Volcanoes

Scientific paper

Many oceanic island basalts show sublinear subparallel arrays in Sr-Nd-Pb isotopic space. The depleted upper mantle is rarely a mixing end-member of these arrays, as would be expected if mantle plumes originated at a 670-kilometer boundary layer and entrained upper mantle during ascent. Instead, the arrays are fan-shaped and appear to converge on a volume in isotopic space characterized by low Sr-87/Sr-86 and high Nd-143/Nd-144, Pb-206/Pb-204, and He-3/He-4 ratios. This new isotopic component may be the lower mantle, entrained into plumes originating from the core-mantle boundary layer.

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