AustralieFrV1, Main, Exploration, bibRecord, 00C204

Non-chondritic distribution of the highly siderophile elements in mantle sulphides

Identifieur interne : 00C204 ( Main/Exploration ); précédent : 00C203; suivant : 00C205

Non-chondritic distribution of the highly siderophile elements in mantle sulphides

Auteurs : Olivier Alard [Australie] ; William L. Griffin [Australie] ; Jean Pierre Lorand [France] ; Simon E. Jackson [Australie] ; Suzanne Y. O'Reilly [Australie]

Source :

Nature : (London) [ 0028-0836 ] ; 2000.

RBID : Pascal:00-0526774

Descripteurs français

Pascal (Inist)
- Sulfure, Péridotite, Manteau, Elément sidérophile, Abondance, Analyse éléments traces, Spectrométrie masse, Plasma couplé inductivement, Ablation, Méthode laser, Osmium, Iridium, Palladium, Rapport chimique, Elément groupe platine, Pentlandite, Residuum, Fusion partielle, Métasomatose, Spectrométrie ICP, Variabilité.

English descriptors

KwdEn :
- ablation, abundance, chemical ratios, inductively coupled plasma, iridium, laser methods, mantle, mass spectroscopy, metasomatosis, osmium, palladium, partial melting, pentlandite, peridotites, platinum group, residuum, siderophile elements, sulfides, trace-element analyses.

Abstract

The abundances of highly siderophile (iron-loving) elements (HSEs) in the Earth's mantle provide important constraints on models of the Earth's early evolution. It has long been assumed that the relative abundances of HSEs should reflect the composition of chondritic meteorites-which are thought to represent the primordial material from which the Earth was formed. But the non-chondritic abundance ratios recently found in several types of rock derived from the Earth's mantle^1-3 have been difficult to reconcile with standard models of the Earth's accretion^4-9, and have been interpreted as having arisen from the addition to the primitive mantle of either non-chondritic extraterrestrial material or differentiated material from the Earth's core. Here we report in situ laser-ablation analyses of sulphides in mantle-derived rocks which show that these sulphides do not have chondritic HSE patterns, but that different generations of sulphide within single samples show extreme variability in the relative abundances of HSEs. Sulphides enclosed in silicate phases have high osmium and iridium abundances but low Pd/ Ir ratios, whereas pentlandite-dominated interstitial sulphides show low osmium and iridium abundances and high Pd/Ir ratios. We interpret the silicate-enclosed sulphides as the residues of melting processes and interstitial sulphides as the crystallization products of sulphide-bearing (metasomatic) fluids. We suggest that non-chondritic HSE patterns directly reflect processes occurring in the upper mantle-that is, melting and sulphide addition via metasomatism-and are not evidence for the addition of core material or of exotic' meteoritic components.

Affiliations:

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Le document en format XML

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<front><div type="abstract" xml:lang="en">The abundances of highly siderophile (iron-loving) elements (HSEs) in the Earth's mantle provide important constraints on models of the Earth's early evolution. It has long been assumed that the relative abundances of HSEs should reflect the composition of chondritic meteorites-which are thought to represent the primordial material from which the Earth was formed. But the non-chondritic abundance ratios recently found in several types of rock derived from the Earth's mantle<sup>1-3</sup>
 have been difficult to reconcile with standard models of the Earth's accretion<sup>4-9</sup>
, and have been interpreted as having arisen from the addition to the primitive mantle of either non-chondritic extraterrestrial material or differentiated material from the Earth's core. Here we report in situ laser-ablation analyses of sulphides in mantle-derived rocks which show that these sulphides do not have chondritic HSE patterns, but that different generations of sulphide within single samples show extreme variability in the relative abundances of HSEs. Sulphides enclosed in silicate phases have high osmium and iridium abundances but low Pd/ Ir ratios, whereas pentlandite-dominated interstitial sulphides show low osmium and iridium abundances and high Pd/Ir ratios. We interpret the silicate-enclosed sulphides as the residues of melting processes and interstitial sulphides as the crystallization products of sulphide-bearing (metasomatic) fluids. We suggest that non-chondritic HSE patterns directly reflect processes occurring in the upper mantle-that is, melting and sulphide addition via metasomatism-and are not evidence for the addition of core material or of exotic' meteoritic components.</div>
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Non-chondritic distribution of the highly siderophile elements in mantle sulphides

Non-chondritic distribution of the highly siderophile elements in mantle sulphides

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

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