Alkaline Rocks and Carbonatites of the World

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Wapikopa Lake


Occurrence number: 
Longitude: -88, Latitude: 52.77

Wapikopa Lake is an elliptical complex covering 98 km2, intruded into Precambrian orthogneisses. It consists of a core of pyroxene syenite with an outer zone, best developed in the southeast, of a mafic pyroxene syenite. The mafic syenite consists of 25-70% augite/aegirine-augite in crystals up to 1 cm in length and sometimes rimmed by amphibole, perthite, up to 15% apatite, abundant sphene and a little quartz. The core syenites are mineralogically similar but with only 5-35% pyroxene. Dykes of amphibole syenite occur on the northwestern margin of the complex. The syenites are highly potassic and BaO values approach 1.5%.

K-Ar gave 2534±147 Ma (Bell and Watkinson, unpublished data, quoted by Sage, 1983a, p. 5).
SAGE, R.P. 1983a. Geology of the Wapikopa Lake alkalic rock complex. Open File Report, Ontario Geological Survey, 5419: 1-82.
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