| 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. |
| Genre: | Article |
| ProdID: | 70019081 |
| Citation Author: | Walker, R. J.; Morgan, J. W.; Horan, M. F. |
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| Citation End Page: | 822 |
| Citation Issue: | 5225 |
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| Citation Language: | English |
| Citation Larger Work Title: | Science |
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| Citation Number Of Pages: | 4 |
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| Citation Search Results Text: | Osmium-187 enrichment in some plumes: Evidence for core-mantle interaction?; 1995; Article; Journal; Science; Walker, R. J.; Morgan, J. W.; Horan, M. F. |
| Citation Start Page: | 819 |
| Citation Volume: | 269 |
| Citation Year: | 1995 |
| Type: | citation/reference |
| Text: | Osmium-187 enrichment in some plumes: Evidence for core-mantle interaction?; 1995; Article; Journal; Science; Walker, R. J.; Morgan, J. W.; Horan, M. F. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1995 00:00 -0600 |
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