In situ Os isotopes in abyssal peridotites bridge the isotopic gap between MORBs and their source mantle

Olivier Alard (), Ambre Luguet, Norman J. Pearson, William L. Griffin, Jean-Pierre Lorand, Abdelmouhcine Gannoun, Kevin W. Burton and Suzanne Y. O'Reilly
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Olivier Alard: Macquarie University
Ambre Luguet: Muséum National d'Histoire Naturelle
Norman J. Pearson: Macquarie University
William L. Griffin: Macquarie University
Jean-Pierre Lorand: Muséum National d'Histoire Naturelle
Abdelmouhcine Gannoun: The Open University
Kevin W. Burton: The Open University
Suzanne Y. O'Reilly: Macquarie University

Nature, 2005, vol. 436, issue 7053, 1005-1008

Abstract: Abstract Abyssal peridotites are assumed to represent the mantle residue of mid-ocean-ridge basalts (MORBs). However, the osmium isotopic compositions of abyssal peridotites and MORB do not appear to be in equilibrium1,2,3,4,5,6,7,8, raising questions about the cogenetic relationship between those two reservoirs. However, the cause of this isotopic mismatch is mainly due to a drastic filtering of the data based on the possibility of osmium contamination by sea water5. Here we present a detailed study of magmatic sulphides (the main carrier of osmium) in abyssal peridotites and show that the 187Os/188Os ratio of these sulphides is of primary mantle origin and can reach radiogenic values suggesting equilibrium with MORB. Thus, the effect of sea water on the osmium systematics of abyssal peridotites has been overestimated and consequently there is no true osmium isotopic gap between MORBs and abyssal peridotites.

Date: 2005
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DOI: 10.1038/nature03902

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