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

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

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Published via the yankee 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 United States (Figure 1). on the northern finish of the diversity, among 47°N and 49°N, the typical elevation raises, peaks develop into sharper, a variety of small glaciers live on at the greater slopes, and volcanic rocks of the Cascade arc are scarce. This area is the North Cascades diversity. The North Cascades are bounded at the west through the fore-arc basin of the Puget Lowland, at the south via the arc volcanic rocks of the principal Cascades, and at the southeast by way of the back-arc flood basalts of the Columbia Plateau. The geologic id of the variety isn't so truly outlined to the north, however it is geographically bounded at the northeast through 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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Extra info for Accreted Terranes of the North Cascades Range, Washington: Spokane to Seattle, Washington, July 21-29, 1989

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Koe \:': ': :. / .....! f{;'/ { :.......... ; ;:! : . ",:') / '. :. . : .. :~' ..... ". ,i / \...... ~". ~... ~;.. ••.. Colonial i Peak ;........ ~ I~ ~ 1I FIGURE 14. Diagrammatic cross section of antifonn in Skagit Gneiss of Misch [1966] (TKso and TKsp). Eldorado Orthogneiss (Koe) shown down-faulted into orogen. Diagonal lines denote strongest migmatization. Location of section and other unit symbols shown in Figure 9, map 4. Roadcuts provide a wonderful display of Skagit migmatites; we will examine some of them tomorrow.

Eldorado Orthogneiss (Koe) shown down-faulted into orogen. Diagonal lines denote strongest migmatization. Location of section and other unit symbols shown in Figure 9, map 4. Roadcuts provide a wonderful display of Skagit migmatites; we will examine some of them tomorrow. 0) Bridge across Gorge Lake (Skagit River). View of the town of Diablo, a private community for employees of Seattle City Light, which owns the dams along the Skagit River. 0) Turn left (northwest) to Diablo Dam. 5) Diablo Dam.

It shares its northeast orientation with a few other young plutons of the Cascade Pass family (Section IV) and many smaller dikes throughout the North Cascades. K-Ar ages of hornblende and biotite pairs are concordant at about 18 Ma, that is, early Miocene [Engels and others, 1976]. Surficial volcanic rocks of this age do not occur this far north in the uplifted North Cascades, but are voluminous 120 km to the south (Section IV). The trail switchbacks intenninably down the steep hillside, mostly in forest, and passes poor outcrops of hornblende-biotite tonalite of the Cascade Pass dike and, in the lower parts, hornfelsic Eldorado Orthogneiss.

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