| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 9522538 | Earth and Planetary Science Letters | 2005 | 16 Pages |
Abstract
Results indicate that 187Os/188Os variations on a scale of mm3 may be quite large within the upper mantle, mimicking heterogeneities observed in both hand-and outcrop-scale samples of upper mantle materials. Highly depleted compositions relative to ambient upper mantle with chondritic 187Os/188Os require that some of the heterogeneities must be >1 Ga. The homogeneity of the 186Os/188Os ratios lend no support to the contention that isotopic heterogeneities within the upper mantle may explain coupled 186Os-187Os enrichments that have been observed in putative plume derived lavas.
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Physical Sciences and Engineering
Earth and Planetary Sciences
Earth and Planetary Sciences (General)
Authors
R.J. Walker, A.D. Brandon, J.M. Bird, P.M. Piccoli, W.F. McDonough, R.D. Ash,