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Compositional variation of laurite at Union Section in the Western Bushveld Complex

Maier Wolfgang D., Prichard Hazel Margaret, Barnes Sarah-Jane et Fisher Peter C.. (1999). Compositional variation of laurite at Union Section in the Western Bushveld Complex. South African Journal of Geology, 102, (3), p. 286-292.

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URL officielle: http://geoscienceworld.org/georef/2000-011860

Résumé

One hundred and forty five grains of laurite in polished sections of samples from one borehole through the major chromitite layers and some chromite-bearing silicate rocks of the Lower and Critical Zones of the western Bushveld Complex at Union Section have been located and analysed by scanning electron microscope. Ninety per cent by number of laurite grains are included within chromite, with the remainder being located on chromite-silicate grain boundaries, and in interstitial silicates and sulphides. The composition of laurite shows considerable variation within individual samples. Furthermore, there is no apparent correlation between whole-rock Ru and Cr contents in our samples, arguing against a model whereby laurite exsolved from the chromite lattice. Based on a well-defined correlation between whole-rock S, PPGE (Rh+Pt+Pd), and IPGE (Os+Ir+Ru) contents, we favour a mechanism whereby laurite crystallized from segregating sulphide melt and was subsequently entrapped by growing chromite grains.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:102
Numéro:3
Pages:p. 286-292
Version évaluée par les pairs:Oui
Date:1999
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, boreholes, Bushveld Complex, chemical composition, chromitite, correlation, crystallization, igneous rocks, lattice, laurite, plutonic rocks, polished sections, samples, scanning electron microscopy, SEM data, silicates, South Africa, Southern Africa, sulfides, ultramafics, Union Section Mine, variations
Déposé le:06 juin 2016 13:03
Dernière modification:09 déc. 2016 14:27
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