Economic Geology and Geophysics of the Oka Alkaline Complex, Quebec
D. P. Gold *Dept. of Geochemistry and Mineralogy, The Pennsylvania State University, University Park, Pennsylvania; M. Vallee SOQUEM, Ste-Foy, Que. (formerly with St. Lawrence Columbium & Metals Corp. Oka, Que.); J.-P. Charette Hydro-Quebec, Montreal, Que. t(formerly with the Gravity Division, Dominion Observatory, Ottawa, Ont.)
The Oka Carbonatite and Alkaline Complex is a Lower Cretaceous intrusive body of the Monteregian petrographic province. Carbonate rocks of various types, and associated alkaline rocks of the ijolite and okaite suites, are distributed in a double ring-dyke structure 4 Yi miles long by 1 1/2 miles across. Alnoite and alrioite breccia pipes intrude all rocks of the Complex and indicate, from inclusions, that a cover of Palaeozoic rocks existed at the time of emplacement.