Osmium-187 enrichment in some plumes: evidence for core-mantle interaction?
作者： R. J. Walker , J. W. Morgan , M. F. Horan
DOI: 10.1126/SCIENCE.269.5225.819
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摘要: Calculations with data for asteroidal cores indicate that Earth's outer core may have a rhenium/osmium ratio at least 20 percent greater than of the chondritic upper mantle, potentially leading to an osmium-187/osmium-188 8 chondrites. Because much abundance osmium in relative even small addition metal plume ascending from D" layer would transfer enriched isotopic signature mixture. Sources certain plume-derived systems seem osmium-187/osmium-l88 ratios 5 chondrites, consistent ascent core-mantle boundary.
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