Geology of Ore Deposits

, Volume 49, Issue 7, pp 599–606 | Cite as

Spinel-group minerals in rocks of the Khibiny alkaline pluton, Kola Peninsula

  • G. Yu. Ivanyuk
  • Ya. A. Pakhomovsky
  • N. G. Konopleva
  • V. N. Yakovenchuk
  • Yu. P. Men’shikov
  • Yu. A. Mikhailova


Seven spinel-group minerals in various geological settings have been revealed in the rocks of the Khibiny pluton. Hercynite, gahnite, and vuorelainenite occur only in xenoliths of hornfels after volcanic and sedimentary rocks, whereas spinel and magnesiochromite occur in alkaline ultramafic rocks of dike series. Franklinite has been discovered in a low-temperature hydrothermal vein. Ubiquitous magnetite is abundant in foyaite, foidolites, alkaline ultrabasic rocks, and pegmatite and hydrothermal veins and may even be the main mineral in some foidolite varieties. The spinel-group minerals are characterized by various chemical compositions due to the fractionation of nepheline syenites resulting in formation of the Main ring of foidolites and apatite-nepheline ore. Like most other minerals found throughout the pluton, magnetite is characterized by variation in the chemical composition along the radial line from the contact with country Proterozoic volcanic rocks to the geometric center of the pluton. Toward the center, the total Ti and Mn contents in magnetite increase from 5–15 up to 40 at %.


Sedimentary Rock Kola Peninsula Nepheline Syenite Main Ring Hydrothermal Vein 
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Copyright information

© Pleiades Publishing, Ltd. 2007

Authors and Affiliations

  • G. Yu. Ivanyuk
    • 1
  • Ya. A. Pakhomovsky
    • 1
  • N. G. Konopleva
    • 1
  • V. N. Yakovenchuk
    • 1
  • Yu. P. Men’shikov
    • 1
  • Yu. A. Mikhailova
    • 1
  1. 1.Geological Institute, Kola Scientific CenterRussian Academy of SciencesApatity, Murmansk oblastRussia

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