Accreted Terranes of the North Cascades Range, Washington: - download pdf or read online

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 diversity is an lively north-trending volcanic arc on the western fringe of North the United States (Figure 1). on the northern finish of the variety, among 47°N and 49°N, the typical elevation raises, peaks turn into sharper, a number of small glaciers continue to exist at the larger slopes, and volcanic rocks of the Cascade arc are scarce. This sector is the North Cascades diversity. The North Cascades are bounded at the west by way of the fore-arc basin of the Puget Lowland, at the south via the arc volcanic rocks of the critical Cascades, and at the southeast by way of the back-arc flood basalts of the Columbia Plateau. The geologic id of the diversity isn't so in actual fact outlined to the north, however it is geographically bounded at the northeast via 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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Extra info for Accreted Terranes of the North Cascades Range, Washington: Spokane to Seattle, Washington, July 21-29, 1989

Sample text

0 Intersection of 1-90 and Maple Street, Spokane. Take 190 west 2 miles (3 Ian) to US 2, follow US 2 west through Reardon (22 miles/35 km) and Davenport (35 miles/56 km). For the next two hours we drive across the north edge of the Columbia River plateau, a moderate-sized flood basalt province. 5 and 6 Ma. The volume of tholeiitic basalt has been estimated to be 2x10 5 km 3 [Swanson and Wright, 1978]. During the late Pleistocene the surface of the plateau was modified by catastrophic floods (jokulhlaup) issuing from glacial Lake Missoula in western Montana.

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).

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.

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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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