Osmium-187 enrichment in some plumes: Evidence for core-mantle interaction?
Science
By: R.J. Walker, J. W. Morgan, and M.F. Horan
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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.
| 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 |
| Google Analytic Metrics | Metrics page |