Abstract
The Acadians Range Complex in northern New Brunswick contains extensively deformed felsic volcanic rocks of the Middle Ordovician Tetagouche Group. The felsic volcanic rocks contain a cryptic stratigraphy that has been obscured by deformation and low grade metamorphism. Using detailed petrology and geochemistry the felsic volcanic rocks have been subdivided into three formations and two intrusive lithodemes. The Caribou Mine Formation consists of three distinct feldspar phyric members and is readily distinguished from the rest of the complex by its phenocryst population. The approximately contemporary Nepisiguit Falls Formation consists of a series of mostly pyroclastic quartz-feldspar porphyries. The Flat Landing Brook Formation is dominated by nearly aphyric ignimbrites and rhyolite flows. A region of coarse co-ignimbritic breccias is interpreted to represent a caldera. The two lithodemes are quartz-feldspar porphyries that are identified by their phenocryst populations and their chemical compositions.
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