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Osmium isotope heterogeneity in the constituent phases of mid-ocean ridge basalts

Gannoun, A.; Burton, K. W.; Thomas, L. E.; Parkinson, I. J.; van Calsteren, P. and Schiano, P. (2004). Osmium isotope heterogeneity in the constituent phases of mid-ocean ridge basalts. Science, 303(5654) pp. 70–72.

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Radiogenic isotope variations in mid-ocean ridge basalts (MORB) are commonly attributed to compositional variations in Earth's upper mantle. For the rheniumosmium 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.

Item Type: Journal Article
ISSN: 0036-8075
Academic Unit/Department: Science > Environment, Earth and Ecosystems
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 9072
Depositing User: Peter van Calsteren
Date Deposited: 21 Sep 2007
Last Modified: 02 Dec 2010 20:03
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