The Sept Iles Intrusive Suite, Quebec, Canada

  • Olivier Namur
  • Michael D. Higgins
  • Jacqueline Vander Auwera
Chapter
Part of the Springer Geology book series (SPRINGERGEOL)

Abstract

The Sept Iles Intrusive Suite (Quebec, Canada) is made up of a large layered intrusion, late gabbro intrusions and a composite sill (Pointe du Criard Sill). The layered intrusion crystallized from a ferrobasaltic magma and is subdivided into a Layered Series of troctolite and gabbro, an anorthositic Upper Border Series and a granitic Upper Series. The formation of the Upper Border Series resulted from plagioclase flotation from the base to the roof of the magma chamber. Fractionation of troctolites and gabbros in the Layered Series resulted in SiO2-enrichment and FeOt-depletion of the residual melt, ultimately forming the granite of the Upper Series. The solidification history of the Layered Series was interrupted by two major and a series of minor influxes of ferrobasaltic melt, significantly enlarging the size of the initial magma chamber. As a consequence, the Layered Series can be subdivided into three megacyclic units (MCU I, II and III). Mixing between resident magma and undifferentiated melt during replenishments had an important influence on both mineral compositions and the liquid lines of descent during the crystallization of the various megacyclic units. It is shown that the liquid line of descent during crystallization of MCU II reached silicate liquid immiscibility. Immiscible melts crystallized two different types of apatite-bearing gabbros, one of which is a major P–Ti–Fe deposit. Cumulate rocks in the layered intrusion show a wide range of crystallized interstitial liquid content. Expelling of this liquid from the crystal mush during solidification is explained both by compaction and compositional convection, but the relative efficiency of these two processes is shown to change significantly with differentiation.

Keywords

Ferrobasalt Cumulate Anorthosite Granite Magma chamber processes 

Notes

Acknowledgements

Research on Sept Iles by the authors was funded by the Belgian National Fund for Scientific Research (FNRS), the Belgian Fund for Research in Industry and Agriculture (FRIA) and the Natural Science and Engineering Research Council of Canada, Discovery grants program. ON acknowledges the FRIA for a position as PhD student and the University of Liège for a teaching assistantship. ON also acknowledges support from the Natural Environment Research Council (NERC; United Kingdom), Newton Trust and Magdalene College (University of Cambridge). The Ministère des Ressources Naturelles et de la Faune du Québec and Soquem Inc are thanked for access to drill-cores. We would to thank B. Charlier, J.C. Duchesne, M.J. Toplis, J.P. Liégeois, J. Hermann, C. Pirard and M.B. Holness for comments. Analytical support by G. Bologne, N. Delmelle, H.J. Bernhardt, C. Gilson, C. Allen and J.L. Devidal was also highly appreciated. Constructive reviews by B. Robins and J. VanTongeren as well as detailed comments and editorial handling by R. Latypov were highly appreciated and significantly improved the quality of the manuscript.

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  • Olivier Namur
    • 1
  • Michael D. Higgins
    • 2
  • Jacqueline Vander Auwera
    • 3
  1. 1.Institute of MineralogyUniversity of HannoverHannoverGermany
  2. 2.Sciences de la TerreUniversité du Québec à ChicoutimiChicoutimiCanada
  3. 3.Department of GeologyUniversity of LiegeLiegeBelgium

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