Accreted Terranes of the North Cascades Range, Washington: by Rowland W. Tabor, Ralph A. Haugerud, Edwin H. Brown, R.

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By Rowland W. Tabor, Ralph A. Haugerud, Edwin H. Brown, R. Scott Babcock, Robert B. Miller

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Published by way of the yank Geophysical Union as a part of the Field journey Guidebooks Series.

The Cascade diversity is an energetic north-trending volcanic arc on the western fringe of North the USA (Figure 1). on the northern finish of the variety, among 47°N and 49°N, the common elevation raises, peaks develop into sharper, a variety of small glaciers continue to exist at the greater slopes, and volcanic rocks of the Cascade arc are scarce. This sector is the North Cascades variety. The North Cascades are bounded at the west via the fore-arc basin of the Puget Lowland, at the south by way of the arc volcanic rocks of the principal Cascades, and at the southeast via the back-arc flood basalts of the Columbia Plateau. The geologic id of the diversity isn't really so sincerely outlined to the north, however it is geographically bounded at the northeast by way of the Okanogan levels and at the northwest via the Fraser River, which separates the Cascades from the Coast Mountains.

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Additional info for Accreted Terranes of the North Cascades Range, Washington: Spokane to Seattle, Washington, July 21-29, 1989

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1964] and other rocks of the North Cascade crystalline core from the lower-grade North Creek Volcanics of Misch [1966]. The latter consist of altered intennediate volcanic rocks and feldspathic sandstone of uncertain age which may be part of the lower section of the Methow terrane or may be a separate terrane (M. F. McGroder, written communication, 1987) such as the Little Jack terrane (Figure 9-1). Rocks in the Twisp River fault zone are mainly mylonitic gneiss, garnet-biotite schist, and metaporphyry.

3) Junction with Crater Creek Road. Tum left, toward the Crater Creek trail. 6) Junction with Libby Creek Road. Stay on WA 153. 7) Amphibolite of the Foggy Dew fault zone on right and on hill above. 8) Large outcrops of the Leecher Metamorphics of Barksdale [1975]. 2) Mylonitic gneiss and amphibolite of the Foggy dew fault zone in roadcut on right. Gneiss from this outcrop yielded a discordant V-Pb zircon age of -50 Ma (S. A. Bowring, written communication, 1988). 2) Cross the Methow River. 4) Enter Carlton.

Brittle faults do not significantly interrupt the gradation there. Haugerud [1985] correlated the Maselpanik with the Hozameen, but the abundance of metapelite in the schist suggests it might be correlative with the Jack Mountain Phyllite (and Elija Ridge Schist) of Misch [1966]. The low peninsula extending from the east into Ross Lake, separating Ross Lake from Ruby Arm to the right, is underlain by homogeneous orthogneiss with nearly flat foliation and a well developed N- to NEtrending stretching lineation, an unusual orientation for the North Cascades.

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