An Alkalic Continental Vent Complex of the Dubawnt Group, N.W.T.

Abstract

<p>An Alkalic suite of proterozoic volcanics and their associated sediments, situated within the Dubawnt Group of the Churchill Province, was mapped and studied. Petrography and geochemical analyses were performed on representative specimens. The extrusives and related dykes are thought to have been derived from the differentiation of a single parent magma, as evidenced by several geochemical trends. The units are as follows; intermediate to felsic trachytes and pyroclastics, typically phlogopite phyric and red alkali rhyolites; later volcaniclastic units. A significantly younger diabase dyke cuts these units, all of which overlie the '307' formation.</p>