Thallium isotopic evidence for ferromanganese sediments in the mantle source of Hawaiian basalts

Sune G. Nielsen (), Mark Rehkämper, Marc D. Norman, Alex N. Halliday and Darrell Harrison
Additional contact information
Sune G. Nielsen: ETH Zurich
Mark Rehkämper: ETH Zurich
Marc D. Norman: Australian National University, Australian Capital Territory
Alex N. Halliday: ETH Zurich
Darrell Harrison: ETH Zurich

Nature, 2006, vol. 439, issue 7074, 314-317

Abstract: Abstract Ocean island basalts are generally thought to be the surface expression of mantle plumes, but the nature of the components in the source regions of such mantle plumes is a subject of long-standing debate. The lavas erupted at Hawaii have attracted particular attention, as it has been proposed that coupled 186Os and 187Os anomalies reflect interaction with the Earth's metallic core1,2. It has recently been suggested, however, that such variations could also result from addition of oceanic ferromanganese sediments to the mantle source of these lavas3,4,5. Here we show that Hawaiian picrites with osmium isotope anomalies also exhibit pronounced thallium isotope variations, which are coupled with caesium/thallium ratios that extend to values much lower than commonly observed for mantle-derived rocks. This correlation cannot be created by admixing of core material, and is best explained by the addition of ferromanganese sediments into the Hawaii mantle source region. However, the lack of correlation between thallium and osmium isotopes and the high thallium/osmium ratios of ferromanganese sediments preclude a sedimentary origin for the osmium isotope anomalies, and leaves core–mantle interaction as a viable explanation for the osmium isotope variations of the Hawaiian picrites.

Date: 2006
References: Add references at CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
https://www.nature.com/articles/nature04450 Abstract (text/html)
Access to the full text of the articles in this series is restricted.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:nature:v:439:y:2006:i:7074:d:10.1038_nature04450

Ordering information: This journal article can be ordered from
https://www.nature.com/

DOI: 10.1038/nature04450

Access Statistics for this article

Nature is currently edited by Magdalena Skipper

More articles in Nature from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().