Pluton emplacement by sheeting and vertical ballooning in part of the southeast Coast Plutonic Complex, British Columbia
Batholiths of the Coast Plutonic Complex, in the area of Harrison Lake, British Columbia, are interpreted to have formed by horizontal sheeting and vertical inflation. Zoned ovoid batholiths exhibit sheeted margins as thick as 3 km. Shallow floors are indicated by moderately to gently inward dipping magmatic foliations, the observed trace of floor contacts across topography, and a published deep seismic reflection transect. Mineralogic aureoles under the floors preserve a paragenetic record of increasing pressure during aureole crystallization. Initial pressures of