Abstract
Abstract The Mount Olympus Granite Pluton covers about 15 square miles and is intruded into low-grade metamorphic Ordovician rocks that are deflected from their regional north-south strike into line with the east-west boundaries of the pluton. Both east and north contacts of the pluton dip outward at about 30°. The south contact is steeper, ar.d on the south-west border, contacts dip inward at 75°. At a border zone near the outlet of Boulder Lake the country rock is disposed in small folds plunging parallel to the dip of the granite contact. The higher parts of the pluton, inferred to be close to the roof, show protoclastic structures, including a planar fabric formed mainly by subparallel biotite flakes. Aplite dikes and quartz veins indicate expansion of the pluton during late stages of its emplacement. Part of the pluton was sampled for study of modal variation. Areal variation in quartz percent is illustrated by a contour map. Biotite- and microcline-bearing granodiorite and adamellite are the dominan...
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