Coupled 186 Os and 187 Os Evidence for Core-Mantle Interaction-Reference-Cited by-同舟云学术

Coupled 186 Os and 187 Os Evidence for Core-Mantle Interaction

Published:1998-06-05 Issue:5369 Volume:280 Page:1570-1573
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Brandon Alan D.¹²³⁴,Walker Richard J.¹²³⁴,Morgan John W.¹²³⁴,Norman Marc D.¹²³⁴,Prichard Hazel M.¹²³⁴

Affiliation:

1. A. D. Brandon, R. J. Walker, J. W. Morgan, Isotope Geochemistry Laboratory, Department of Geology, University of Maryland, College Park, MD 20742, USA.

2. J. W. Morgan, Department of Earth Resources, Colorado State University, Fort Collins, CO 80523, USA.

3. M. D. Norman, GEMOC, School of Earth Sciences, Macquarie University, NSW 2109, Australia.

4. H. M. Prichard, Department of Earth Sciences, University of Wales, Cardiff, CF1 3YE, United Kingdom.

Abstract

Osmium isotopic analyses of picritic lavas from Hawaii show enrichments in the osmium-186/osmium-188 ratio ( 186 Os/ 188 Os) of 0.008 to 0.018%, relative to a chondritic upper mantle, that are positively correlated with enrichments in 187 Os/ 188 Os of 5.4 to 9.0%. The most viable mechanism to produce these coupled 186 Os and 187 Os 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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference33 articles.

1. Mantle Plumes and Entrainment: Isotopic Evidence

2. Asymmetric Phase Effects and Mantle Convection Patterns

3. D" is the lowermost 200 km of the mantle. It is characterized by distinct seismic discontinuities relative to the overlying mantle.

4. E. Knittle, R. Jeanloz, Geophys. Res. Lett. 16, 609 (1989); Q. Williams, E. J. Garnero, Science 273, 1528 (1996); L. H. Kellog, S. D. King, Geophys. Res. Lett. 20, 379 (1993); J.-P. Poirier, J. Geomag. Geoelectr. 45, 1221 (1993); Manga M., Jeanloz R., Geophys. Res. Lett. 23, 3091 (1996); L. H. Kellog, ibid 24, 2749 (1997).

5. The core–mantle boundary layer and deep Earth dynamics

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