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Cumulus processes and the composition of magmatic ore deposits : examples from the Talnakh district, Russia

Zientek M.L., Likhachev A.P., Kunilov V.E., Barnes Sarah-Jane, Meier Allen L., Carlson R.R., Briggs Paul H., Fries T.L. et Adrian B.M.. (1994). Cumulus processes and the composition of magmatic ore deposits : examples from the Talnakh district, Russia. Dans Proceedings of the Sudbury - Noril'sk Symposium Special volume 5. (p. 373-392). Ontario : Ministry of Northern Development and Mines.

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Résumé

A remarkable feature of the Noril'sk-Talnakh area is the mineralogical and compositional zonation of the magmatic sulphide ore deposits. This zonation can be explained by fractional crystallization of sulphide liquid. The compositions of analyzed ore samples can be identified as belonging to a continuum ranging from evolved, residual liquids derived during the fractionation process to cumulates composed primarily of monosulphide solid solution with variable proportions of trapped liquid. Some massive-ore samples display chondrite-normalized platinum group element-gold patterns with negative platinum anomalies. This feature indicates that the dominant control on ore composition is not sulphide liquid-silicate liquid partitioning but is the composition of monosulphide solid solution derived from the crystallization of sulphide liquid. Massive-sulphide ores that have compositional features typical of sulphide cumulates are not limited to the Noril'sk-Talnakh area but occur in several districts in a range of geological settings.

Type de document:Chapitre de livre
Date:1994
Lieu de publication:Ontario
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
Éditeurs:Lightfoot, Peter C.
Naldrett, Anthony J.
Déposé le:02 juin 2016 18:43
Dernière modification:09 déc. 2016 14:25
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