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The concentration of platinum-group elements and gold in southern African and Karelian kimberlite-hosted mantle xenoliths : implications for the noble metal content of the Earth's mantle

Maier Wolfgang D., Peltonen Petri, McDonald Ian, Barnes Sarah-Jane, Hatton Chris et Viljoen F.. (2012). The concentration of platinum-group elements and gold in southern African and Karelian kimberlite-hosted mantle xenoliths : implications for the noble metal content of the Earth's mantle. Chemical Geology, 302-303, p. 119-135.

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URL officielle: http://dx.doi.org/doi:10.1016/j.chemgeo.2011.06.01...

Résumé

We have determined the concentrations of the platinum-group elements and gold in 111 mantle xenoliths from more than 20 kimberlite pipes in southern Africa and the Karelian craton, Fennoscandian Shield, with the aim to constrain the composition of the Archean- early Proterozoic primitive mantle. Average noble metal contents of the southern African peridotite xenoliths (in ppb) are 3.67 Ir, 6.54 Ru, 0.93 Rh, 4.3 Pt, 1.84 Pd, and 1.09 Au, and for the Karelian xenoliths 3.75 Ir, 6.58 Ru, 0.79 Rh, 4.84 Pt, 2.28 Pd, and 1.46 Au. The distribution of PGE-bearing phases is heterogenous, as in previously published datasets of lithospheric mantle from the Kaapvaal and other cratons. We argue that the heterogenous noble metal content of the cratonic lithospheric mantle is partly due to sluggish equilibration of the Archean mantle with late veneer (Maier et al., 2009, Nature, v. 460, 620-623). As a result, the noble metal content of the primitive mantle cannot be accurately determined using cratonic mantle samples. Younger mantle rocks (e.g., orogenic and oceanic peridotites) show more homogenous noble metal contents, but since they formed after the onset of crust formation it is debatable whether their composition accurately defines the noble metal content of PUM.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:0009-2541
Volume:302-303
Pages:p. 119-135
Version évaluée par les pairs:Oui
Date:2012
Sujets:Sciences naturelles et génie > Sciences naturelles > Sciences de la terre (géologie, géographie)
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Unité d'enseignement en sciences de la Terre
Mots-clés:Africa, Archean, Commonwealth of Independent States, continental lithosphere, Europe, geochemistry, gold, gold ores, ICP mass spectra, igneous rocks, inclusions, intrusions, Kaapvaal Craton, Karelia, Karelia Russian ederation, kimberlite, komatiite, lithogeochemistry, lithosphere, mantle, mass spectra, metal ores, metallogeny, metals, mineral deposits, genesis, petrology, pipes, platinum group, platinum ores, Precambrian, Russian Federation, South Africa, Southern Africa, spectra, trace elements, upper mantle, volcanic rocks, X-ray fluorescence spectra, xenoliths
Déposé le:14 juin 2016 18:09
Dernière modification:09 déc. 2016 15:38
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