Aenigmetites from the Ilímaussaq intrusion, south Greenland: Chemistry and petrological implications

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    Aenigmatite in the Ilímaussaq intrusion shows a variety of textural relations to the other mafic minerals and an unusual range in chemical compositions. The saturated and oversaturated rocks contain zoned aenigmatities with Ca, Al, Fe2+-rich cores coexisting with katophorite, and near-ideal Ti-aenigmatite rims coexisting with arfvedsonite and aegirine. The aenigmatite substitutions are outlined, and the varying chemistry discussed. A no-oxide field seems to have existed in the (log fO2, T) space for the undersaturated magma, and an arfvedsonite-aenigmatite oxygen buffer equilibrium is suggested for the coexisting Fe3+-rich aenigmatite and katophorite. This buffer was later invalidated by the stabilisation of aegirine, whereby the Fe3+-aenigmatite component broke down, causing extensive recrystallisation into near-ideal Ti-aenigmatite.

    Original languageEnglish
    Pages (from-to)257-270
    Number of pages14
    Issue number4
    Publication statusPublished - 15 Oct 1977

    Programme Area

    • Programme Area 4: Mineral Resources


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