LiveZilla Live Chat Software

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

Fluid transport of sulfur and metals between sulfide melt and basaltic melt

Baker Don R., Barnes Sarah-Jane, Simon Gail et Bernier Frederic. (2001). Fluid transport of sulfur and metals between sulfide melt and basaltic melt. The Canadian mineralogist, 39, (2), p. 537-546.

[img]
Prévisualisation
PDF
260kB

Résumé

Experiments were performed at 1.0 GPa and temperatures between 1225 and 1450°C to demonstrate the transport of sulfur and metals Cu, Ni and Pt into a basaltic melt via a sulfurous fluid phase. Experiments were performed inside graphite-lined Pt capsules by converting a mixture of FeS2 + NiS2 + CuS into sulfide melt + a sulfurous fluid, which was kept separate from a basaltic melt inside the same Pt capsule by a gas-permeable graphite membrane. The sulfurous fluid is rapidly transported, and the basaltic melt achieves S concentrations similar to saturation values(within 2sigma) in times less than 1 hour, even though the two melts are not in physical contact. The sulfurous fluid is shown to transport significant quantities of Cu, Ni and Pt in 1 hour. Gold is transported out of the melt. A process similar to the one experimentally modeled could occur in nature as magmatic systems heat country rocks to temperatures at which pyrite converts to pyrrhotite + a sulfurous fluid, potentially containing significant quantities of ore metals. The volume change of this reaction could crack the country rocks and allow the fluid to enter the magma chamber. These fluids could then saturate the melt, causing the formation of immiscible sulfide droplets enriched in base and precious metals, eventually forming either the progenitor of an ore deposit or the ore deposit itself.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:39
Numéro:2
Pages:p. 537-546
Version évaluée par les pairs:Oui
Date:2001
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:ore deposits, sulfur, metal transport, copper, nickel, platinum, basalt, experimental petrology.
Déposé le:10 juin 2016 14:12
Dernière modification:09 déc. 2016 14:51
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