Geochemistry of the Île Cadieux monticellite alnöite, Quebec, Canada

The Ile Cadieux alnoite, a small Cretaceous intrusion, is a member of the Monteregian Hills Petrographic Province. Mineral chemistry was determined for olivine, spinel, clinopyroxene, melilite, and a potassium–iron–nickel sulphide akin to djerfisherite. Whole rocks were analysed for major elements and 24 trace elements (including rare-earth elements). The Ile Cadieux alnoitic rocks have greater MgO/Al2O3 ratios than most alnoites but are otherwise similar to typical alnoites with respect to major and trace elements. Comparison of spinel and whole-rock chemical compositions from the Ile Cadieux and Ile Bizard (located 15 km to the northeast) alnoitic intrusions suggests that these magmas were generated under different physicochemical conditions of melting, or alternatively that they are fractions of a single magma which crystallized under different conditions.

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