Metamorphism and Structure of Penfold Creek Area, near Quesnel Lake, British Columbia

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Abstract
The Quesnel Lake area lies within the Omineca Crystalline Belt, and is underlain by the northern extremity of the Shuswap Metamorphic Complex. Closely spaced and steeply dipping isograds mark the margins of the metamorphic belt. In the Penfold Creek area only one and one-half miles separate the biotite and sillimanite isograds. Related to this sharp increase in metamorphic grade there is a marked change in the fold style. In the chlorite zone are similar folds, showing a strong axial-plane cleavage, and tight refolded isoclines dominate in the sillimanite zone. Three periods of deformation and two periods of prograde metamorphism have been recognized, with the first metamorphic period being associated with Phase 2 deformation and the second being post-Phase 2.

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