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An evaluation of proposed platinum group element contents in the parental magmas of the Bushveld complex

Samples collected by the authors and representing three proposed parental magmas of the Bushveld complex were analyzed for their platinum group element (PGE) contents by three different laboratories. Results differ strongly between laboratories, but imply that the parental magmas may have had flatte...

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Bibliographic Details
Published in:Journal of African earth sciences (1994) 1995-11, Vol.21 (4), p.607-613
Main Authors: Merkle, R.K.W., von Gruenewaldt, G., Harney, D.M.W.
Format: Article
Language:English
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Summary:Samples collected by the authors and representing three proposed parental magmas of the Bushveld complex were analyzed for their platinum group element (PGE) contents by three different laboratories. Results differ strongly between laboratories, but imply that the parental magmas may have had flatter chondrite normalized patterns and an overall lower content than previously reported. It seems, however, that the Bushveld magmas were enriched in PGE's relative to average mafic rocks. A clear difference between the three magma types could not be substantiated. At present the PGE content of proposed parental melts of the Bushveld complex must be considered to be insufficiently known to warrant any quantitative models. Les échantillons prélevés par les auteurs et représentant trois magmas-parents proposés du complexe du Bushveld, ont été analysés pour les éléments du groupe du platine (PGE) par trois laboratoires différents. Les résultats diffèrent fortement d'un laboratoire à l'autre, mais impliquent de toutes manières que les magmas-parents aient possédé des spectres normalisés aux chondrites plus plats et des teneurs totales plus basses que ce qui a été précédemment publié. Il semble néanmoins que les magmas du Bushveld étaient enrichis en PGE par rapport à la moyenne des roches mafiques. Une nette différence entre les trois types de magmas n'a pu être confirmée. Pour le moment, les concentrations en PGE des magmas-parents du complexe du Bushveld sont insuffisamment connues que pour être utilisées dans des modèles quantitatifs.
ISSN:1464-343X
1879-1956
DOI:10.1016/0899-5362(95)00105-0