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Osmium-187 enrichment in some plumes: Evidence for core-mantle interaction?

Science
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Abstract

Calculations with data for asteroidal cores indicate that Earth's outer core may have a rhenium/osmium ratio at least 20 percent greater than that of the chondritic upper mantle, potentially leading to an outer core with an osmium-187/osmium-188 ratio at least 8 percent greater than that of chondrites. Because of the much greater abundance of osmium in the outer core relative to the mantle, even a small addition of metal to a plume ascending from the D??? layer would transfer the enriched isotopic signature to the mixture. Sources of certain plume-derived systems seem to have osmium-187/osmium-188 ratios 5 to 20 percent greater than that for chondrites, consistent with the ascent of a plume from the core-mantle boundary.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Osmium-187 enrichment in some plumes: Evidence for core-mantle interaction?
Series title Science
Volume 269
Issue 5225
Year Published 1995
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Science
First page 819
Last page 822
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