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

A Luguet; O Alard; JP Lorand; NJ Pearson; C Ryan; SY 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, JP Lorand, NJ Pearson, C Ryan, SY O'Reilly

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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 core-mantle 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
Early online date	27 Jun 2001
DOIs	https://doi.org/10.1016/S0012-821X(01)00357-0
Publication status	E-pub ahead of print - 27 Jun 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 core-mantle exchange. ",

keywords = "Inductively coupled plasma methods, Peridotites, Siderophile elements, Sulfides",

author = "A Luguet and O Alard and JP Lorand and NJ Pearson and C Ryan and SY O'Reilly",

year = "2001",

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doi = "10.1016/S0012-821X(01)00357-0",

language = "English",

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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, JP

AU - Pearson, NJ

AU - Ryan, C

AU - O'Reilly, SY

PY - 2001/6/27

Y1 - 2001/6/27

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 core-mantle 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 core-mantle exchange.

KW - Inductively coupled plasma methods

KW - Peridotites

KW - Siderophile elements

KW - Sulfides

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

M3 - Article

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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