By Rowland W. Tabor, Ralph A. Haugerud, Edwin H. Brown, R. Scott Babcock, Robert B. Miller
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Published by means of the yank Geophysical Union as a part of the Field journey Guidebooks Series.
The Cascade variety is an energetic north-trending volcanic arc on the western fringe of North the US (Figure 1). on the northern finish of the variety, among 47°N and 49°N, the common elevation raises, peaks turn into sharper, a variety of small glaciers live to tell the tale at the larger slopes, and volcanic rocks of the Cascade arc are scarce. This quarter is the North Cascades diversity. The North Cascades are bounded at the west via the fore-arc basin of the Puget Lowland, at the south by means of the arc volcanic rocks of the significant Cascades, and at the southeast through the back-arc flood basalts of the Columbia Plateau. The geologic id of the diversity isn't so essentially outlined to the north, however it is geographically bounded at the northeast by means of the Okanogan levels and at the northwest by means of the Fraser River, which separates the Cascades from the Coast Mountains.
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Additional resources for Accreted Terranes of the North Cascades Range, Washington: Spokane to Seattle, Washington, July 21-29, 1989
The heterogeneous Lake Juanita leucogneiss unit consists mainly of leucogranodioritic and trondhjemitic biotite gneisses. Most of the unit is lineated, but only weakly to moderately foliated, except near its intrusive contact with the older Tuckaway Lake unit where it is well foliated and locally mylonitic. 2 km south of Eagle Pass has yielded a concordant U-Pb zircon age of about 59 Ma (S. A. Bowring, written communication, 1988). We interpret this as a crystallization age, and to indicate that dynamothennal metamorphism of the gneiss is Cenozoic (Paleocene-early Eocene).
Orthogneiss from this outcrop has yielded roughly concordant V-Pb zircon ages of-65 Ma, but similar-looking rock a few kilometers across strike to the south yields V-Pb zircon ages of -74 Ma (J. S. Stacey, written communications, 1987, 1988). Magmatic epidote is abundant in many of the Late Cretaceous plutons of the North Cascades, including those exposed on the ridges to the south and west of this point. Because of different P-T slopes for the solidus and epidote-breakdown reactions, the two cross, and at T307: 46 River is an unlikely agent to deposit such fine-grained material.
Follow US 97 towards Brewster. 132(212) Enter town of Brewster. 8) Junction with WA 153 and town of Pateros. Turn right onto WA 153. 6) Stop 1-1 Good exposures of the migmatite complex of Alta Lake. 3 km) beyond and walk back (see Figure 8). The Alta Lake unit consists mainly of variably migmatized amphibolite and trondhjemitic orthogneiss, with lesser biotite schist and rare quartzite [Raviola, 1988]. Migmatization resulted from metamorphic differentiation and injection, according to Raviola. These rocks resemble migmatites in the Chelan Complex of Hopson and Mattinson  (see Section I) but may be separated from them by the Ross Lake fault [Raviola, 1988].