Read e-book online Accreted Terranes of the North Cascades Range, Washington: PDF

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

ISBN-10: 0875906125

ISBN-13: 9780875906126

ISBN-10: 1118666712

ISBN-13: 9781118666715

About The Product

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

The Cascade variety is an lively north-trending volcanic arc on the western fringe of North the US (Figure 1). on the northern finish of the diversity, among 47°N and 49°N, the common elevation raises, peaks turn into sharper, quite a few small glaciers continue to exist at the better slopes, and volcanic rocks of the Cascade arc are scarce. This zone is the North Cascades variety. The North Cascades are bounded at the west by way of the fore-arc basin of the Puget Lowland, at the south through the arc volcanic rocks of the vital Cascades, and at the southeast through the back-arc flood basalts of the Columbia Plateau. The geologic identification of the variety 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 way of 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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Both units grade up into the subaerial Midnight Peak Fonnation of Barksdale [1948]; collectively, the three units are laterally equivalent to the Pasayten Group recognized in Manning Park to the north [Coates, 1974; Tennyson and Cole, 1978]. The western chert-rich source may have been the Hozameen Group, uplifted by crustal thickening in the early stages of mid-Cretaceous orogeny (Section II). This thickening seems to have affected the Methow basin as well, as no post-Cenomanian marine strata are present.

The 1:24,000 geologic maps of the Oval Peak and Sun Mountain quadrangles [Miller, 1987] may be useful companions. The trail starts on glacial deposits, but a short distance to the east below the level of the trail Eagle Creek has cut down into the Twisp Valley Schist. Exposures are absent in the first stretch of trail which stays on the west side of Eagle Creek. Large boulders from northern "fmger" of the Paleocene Oval Peak pluton occur along the trail and are from outcrops on Snowshoe Ridge to the north.

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.

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Accreted Terranes of the North Cascades Range, Washington: Spokane to Seattle, Washington, July 21-29, 1989 by Rowland W. Tabor, Ralph A. Haugerud, Edwin H. Brown, R. Scott Babcock, Robert B. Miller


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