(Of a rock or mineral) richer in sodium and/or potassium than is usual for its type.
- In the northern Cordillera lower Paleozoic alkalic and potassic mafic magmatism is linked with rifting of the Selwyn Basin.
- Within the Grenville basement these are represented by alkalic to tholeiitic mafic dykes and alkalic to peralkaline granite plutons.
- Some ore deposits occur in alkalic ultrabasic rocks derived from the Earth's mantle.
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