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

doi:10.1016/S0012-821X(01)00357-0

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

Faculty of Science and Engineering

Research output: Contribution to journal › Article › peer-review

155 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 language	English
Pages (from-to)	285-294
Number of pages	10
Journal	Earth and Planetary Science Letters
Volume	189
Issue number	3-4
DOIs	https://doi.org/10.1016/S0012-821X(01)00357-0
Publication status	Published - 2001

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

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.",

author = "A. Luguet and O. Alard and Lorand, {J. P.} and Pearson, {N. J.} and C. Ryan and O'Reilly, {S. Y.}",

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T1 - Laser-ablation microprobe (LAM)-ICPMS unravels the highly siderophile element geochemistry of the oceanic mantle

AU - Luguet, A.

AU - Alard, O.

AU - Lorand, J. P.

AU - Pearson, N. J.

AU - Ryan, C.

AU - O'Reilly, S. Y.

PY - 2001

Y1 - 2001

N2 - 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.

AB - 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.

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U2 - 10.1016/S0012-821X(01)00357-0

DO - 10.1016/S0012-821X(01)00357-0

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AN - SCOPUS:0034902237

SN - 0012-821X

VL - 189

SP - 285

EP - 294

JO - Earth and Planetary Science Letters

JF - Earth and Planetary Science Letters

IS - 3-4

ER -

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

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