Laser-ablation microprobe (LAM)-ICPMS unravels the highly siderophile element geochemistry of the oceanic mantle

A. Luguet*, O. Alard, J. P. Lorand, N. J. Pearson, C. Ryan, S. Y. O'Reilly

*Corresponding author for this work

Research output: Contribution to journalArticle

137 Citations (Scopus)

Abstract

The highly siderophile element (HSE) contents of base-metal sulphides have been determined by laser-ablation microprobe (LAM)-ICPMS in abyssal peridotites from the Mid-Atlantic and South West Indian ridges. (Pd/Ir)N (0.007-505, N: CI-chondrite-normalised), (Pt/Ir)N (0.001-0.77) and (Rh/Ir)N (0.159-273) vary significantly between both grains and samples, irrespective of indicators of melt removal, but in line with bulk-rock platinum-group element (PGE) ratios and sulphide modal abundances. Positive deviations of PGE abundance ratios in whole-rock analyses are due to late-precipitated Cu-Ni-rich magmatic sulphides from incompletely extracted partial melts. These results contradict explanations of the HSE systematics of the oceanic mantle as reflecting global scale processes such as coremantle exchange.

Original languageEnglish
Pages (from-to)285-294
Number of pages10
JournalEarth and Planetary Science Letters
Volume189
Issue number3-4
DOIs
Publication statusPublished - 2001

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