Authors: Kissin, Stephen A.; Heggie, Geoffrey J.; Franklin, James M.; Somarin, Alireza K.

Source: Canadian Journal of Earth Sciences, Volume 44, Number 8, August 2007 , pp. 1203-1214(12)

Publisher: NRC Research Press

Abstract:

The Seagull and Kitto intrusions in the Nipigon Embayment of northwestern Ontario were studied to gain an understanding of the processes involved in sulfur saturation of the mafic to ultramafic magmas leading to the formation of platinum group element (PGE) concentrations. Profiles of sulfur, copper, nickel, gold, palladium, and platinum concentrations as a function of depth revealed that sulfur saturation occurred at the base of the Seagull intrusion. A higher grade horizon occurs well above the base of the intrusion, suggesting that a reef-type of process was significant here and possibly in the Kitto intrusion, as well. Olivine compositions indicate that, in both cases, the parental magmas were undersaturated with respect to sulfur. Sulfur, neodymium-samarium, and rubidium-strontium isotopic data suggest that assimilation of country rock and sulfide played a role, especially in the formation of basal concentrations of PGEs.

Les intrusions Seagull et Kitto dans l'enfoncement de Nipigon au nord-ouest de l'Ontario ont été étudiées dans le but de comprendre les processus impliqués dans la saturation par le soufre des magmas mafiques à ultramafiques qui ont conduit à des concentrations de métaux du groupe du platine (MGP). Des profils des concentrations de soufre, de cuivre, de nickel, d'or, de palladium et de platine, en fonction de la profondeur, ont révélé que la saturation en soufre avait lieu à la base de l'intrusion Seagull. Un horizon à plus haute teneur se retrouve bien au-dessus de la base de l'intrusion, conduisant à l'hypothèse qu'un processus de type récif y était significatif et qu'il l'était possiblement aussi dans l'intrusion Kitto. Les compositions de l'olivine indiquent que, dans les deux cas, les magmas parents étaient sous-saturés en soufre. Les données isotopiques sur le soufre, le néodyme - samarium et le rubidium - strontium suggèrent que l'assimilation de la roche encaissante et des sulfures ait joué un rôle, surtout dans la formation des concentrations basales des métaux du groupe du platine (MGP).[Traduit par la Rédaction]

Document Type: Research article

Publication date: 2007-08-01

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• Published since 1963, this monthly journal reports current research in climate and environmental geoscience; geoarchaeology and forensic geoscience; geochronology and geochemistry; geophysics; GIS and geomatics; hydrology; mineralogy and petrology; mining and engineering geology; ore deposits and economic geology; paleontology, petroleum geology and basin analysis; physical geography and Quaternary geoscience; planetary geoscience; sedimentology and stratigraphy; soil sciences; and structural geology and tectonics. It also publishes special issues that focus on information and studies about a particular segment of earth sciences.
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