Faulting in the Foam Creek Stock, North Cascade Mountains, Washington
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The Foam Creek Stock (FCS) is a tonalite pluton in the northwestern part of the Nason Terrane in Washington state, a region that has experienced a wide range of structural regimes. Faults cutting the FCS have been studied through field, microscope, fluid inclusion, and geochemical methods. The purpose of this study is to understand the nature of these faults, and their place in the regional tectonic history. The FCS is cut by two populations (P1 and P2) of small-scale faults that share similar orientations but are microstructurally and geochemically distinct. P1 faults are generally E-dipping ...