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Coupled 186Os and 187Os evidence for core-mantle interaction

Brandon, A. D., Walker, Richard, Morgan, John W., Norman, Marc D. and Prichard, Hazel Margaret 1998. Coupled 186Os and 187Os evidence for core-mantle interaction. Science 280 (5369) , pp. 1570-1573. 10.1126/science.280.5369.1570

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Osmium isotopic analyses of picritic lavas from Hawaii show enrichments in the osmium-186/osmium-188 ratio (186Os/188Os) of 0.008 to 0.018%, relative to a chondritic upper mantle, that are positively correlated with enrichments in 187Os/188Os of 5.4 to 9.0%. The most viable mechanism to produce these coupled 186Os and187Os enrichments is by addition of 0.5 to 1 weight percent of outer core metal to a portion of the D" layer and subsequent upwelling of the mixture. These data suggest that some plumes originate at the core-mantle boundary and that Os isotopes may be used to distinguish plumes derived from shallow versus deep mantle sources.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > QE Geology
ISSN: 0036-8075
Last Modified: 10 Oct 2017 13:20

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