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

被引：146
作者：
Luguet, A
Alard, O
Lorand, JP
Pearson, NJ
Ryan, C
O'Reilly, SY
机构：
[1] CNRS, Lab Mineral, FR 32, F-75005 Paris, France
[2] Natl Museum Nat Hist, F-75005 Paris, France
[3] Macquarie Univ, Sch Earth & Planetary Sci, GEMOC, ARC Natl Key Ctr Geochem Evolut & Metallogeny Con, Sydney, NSW 2109, Australia
[4] CSIRO Explorat & Min, N Ryde, NSW 2113, Australia
来源：
EARTH AND PLANETARY SCIENCE LETTERS | 2001年 / 189卷 / 3-4期
关键词：
siderophile elements; inductively coupled plasma methods; sulfides; peridotites;
D O I：
10.1016/S0012-821X(01)00357-0
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
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. (C) 2001 Elsevier Science B.V. All rights reserved.
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页码：285 / 294
页数：10
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