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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