Computer Science
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001e%26psl.189..285l&link_type=abstract
Earth and Planetary Science Letters, Volume 189, Issue 3-4, p. 285-294.
Computer Science
20
Scientific paper
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 core-mantle exchange.
Alard Olivier
Lorand Jean-Pierre
Luguet Ambre
O'Reilly Suzanne Y.
Pearson Norm J.
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