By Rowland W. Tabor, Ralph A. Haugerud, Edwin H. Brown, R. Scott Babcock, Robert B. Miller
About The Product
Published via the yankee 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 diversity, among 47°N and 49°N, the common elevation raises, peaks turn into sharper, various small glaciers continue to exist at the greater 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 via the fore-arc basin of the Puget Lowland, at the south by way of the arc volcanic rocks of the vital Cascades, and at the southeast by means of the back-arc flood basalts of the Columbia Plateau. The geologic identification of the variety isn't so basically 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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Extra info for Accreted Terranes of the North Cascades Range, Washington: Spokane to Seattle, Washington, July 21-29, 1989
6) Stop 3-3 As the trail begins to descend to the west, continue straight (north) along the ridge (Figure 92). Here, in the Gabriel Peak tectonic belt, the Lake Juanita leucogneiss unit is in contact with the probable southern continuation of the Gabriel Peak Orthogneiss of Misch . The Lake Juanita unit has developed a strong fabric and displays S-C relations near the contact with the Gabriel Peak. Foliation is subparallel to the contact which, in this area, typically dips 65-70° to the northeast.
Outcrop across the highway is massive biotitehornblende quartz diorite orthogneiss~veined by extensive light-colored dikes. From this point to beyond the turnoff to Diablo outcrops are dominantly paragneiss. 5). Thunder Creek drains some of the most extensive glaciers in the North Cascades. Glacially-ground rock flour produces the milky green color of Thunder Ann. 5). Lake is in a glacier-calVed depression along the Thunder Lake fault (see Stop 6-5). 4) Roadcuts at this junction display both older, pegmatitic, main Skagit leucosomes and younger, fine-grained, cross-cutting late lineated dikes.
The gently Nplunging stretching lineation and steep foliation suggest that this is a strike-slip zone, and DiLeonardo  has postulated dextral slip on the basis of sparse kinematic indicators. This high strain zone defonns the pre-Lower Cretaceous Newby Group of Barksdale -perhaps correlative with the Ladner Group (Figure 4)----of the Methow terrane and is truncated to the south by the middle Eocene Cooper Mountain batholith. 1) Road junction, keep straight. 4) Begin large outcrops of the Newby Group.
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