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Structure, Metamorphism, And Geochronology Along The Southern Margin Of The Breakenridge Orthogneiss, Coast Range, Southern British Columbia, John A. (John Andrew) Feltman
Structure, Metamorphism, And Geochronology Along The Southern Margin Of The Breakenridge Orthogneiss, Coast Range, Southern British Columbia, John A. (John Andrew) Feltman
WWU Graduate School Collection
The Breakenridge orthogneiss is located at the southern end of the Coast Plutonic Complex, in the southwest Canadian Cordillera. It consists of sheeted orthogneiss sills and metamorphosed country rock folded into a tight, upright antiform. The deformational and metamorphic history along the southern margin of this structure is the focus of this study.
The orthogneiss is in original intrusive contact with enveloping metavolcanic rocks of the Jura-Cretaceous Slollicum Schist. A new U-Pb zircon age of 103.8 ± 0.5 Ma, together with a published age of 96 Ma (Parrish and Monger, 1992), establishes an episode of igneous intrusion and crystallization between …