Osmium Isotope Heterogeneity in the Constituent Phases of Mid-Ocean Ridge Basalts

Abdelmouhcine Gannoun*, Kevin W. Burton, Louise E. Thomas, Ian J. Parkinson, Peter Van Calsteren, Pierre Schiano

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

51 Citations (Scopus)

Abstract

Radiogenic isotope variations in mid-ocean ridge basalts (MORB) are commonly attributed to compositional variations in Earth's upper mantle. For the rhenium-osmium isotope system, constituent MORB phases are shown to possess exceptionally high Re/Os (parent/daughter) ratios, consequently radiogenic 187Os is produced from the decay of 187Re over short periods of time. Thus, in the absence of precise age constraints, Os isotope variations cannot be unambiguously attributed to their source, although Re-Os isotope data for constituent minerals can yield crystallization ages, details of equilibration, and initial Os isotope values that relate directly to the mantle source.

Original languageEnglish
Pages (from-to)70-72
Number of pages3
JournalScience
Volume303
Issue number5654
DOIs
Publication statusPublished - 2 Jan 2004

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