Constellation, le dépôt institutionnel de l'Université du Québec à Chicoutimi

Formation of Bushveld PGE Reefs due to magma chamber subsidence and mobility of cumulate slurries

Maier Wolfgang D., Barnes Sarah-Jane et Groves D.I.. (2010). Formation of Bushveld PGE Reefs due to magma chamber subsidence and mobility of cumulate slurries. Dans : 11th International Platinum Symposium (11th IPS), Laurentian University , June 21-24, 2010, Laurentian University, Sudbury, Ontario.

[img] PDF
Administrateurs seulement



The Bushveld magmas were strongly sulfide undersaturated during emplacement, leading to accumulation of S-poor ultramafic cumulates of the Lower and Lower Critical zones. The magmas in the chamber eventually reached sulfide saturation in response to differentiation, forming sulfide-bearing noritic cumulates of the Upper Critical Zone and gabbonoritic cumulates of the Upper Zone. Prior to complete solidification of the rocks, the Main Zone was injected as the last major magma addition into the pile of cumulate mushes. This caused subsidence of the chamber, mobilization and mixing of semi-consolidated cumulate mushes and, in places, gravity-driven, mechanical un-mixing of crystals and liquid leading to the formation of distinct layers, plugs and pipes enriched in olivine, pyroxene, plagioclase, chromite, magnetite, and sulfides, particularly in more centrally located portions of the Bushveld Igneous Complex.

Type de document:Matériel de conférence (Article)
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
Déposé le:06 juill. 2016 17:59
Dernière modification:17 nov. 2017 00:39
Afficher les statistiques de telechargements

Éditer le document (administrateurs uniquement)

Creative Commons LicenseSauf indication contraire, les documents archivés dans Constellation sont rendus disponibles selon les termes de la licence Creative Commons "Paternité, pas d'utilisation commerciale, pas de modification" 2.5 Canada.

Bibliothèque Paul-Émile-Boulet, UQAC
555, boulevard de l'Université
Chicoutimi (Québec)  CANADA G7H 2B1
418 545-5011, poste 5630