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 by means of the yankee 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 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 by way of 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 via the back-arc flood basalts of the Columbia Plateau. The geologic id of the diversity isn't really so essentially outlined to the north, however it is geographically bounded at the northeast via the Okanogan levels and at the northwest through 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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K. Nakata, written communication, 1987). The tonalitic Battle Mountain unit is the oldest of the orthogneisses in this area and is intruded by sills of the structurally lower Tuckaway Lake unit. The Battle Mountain unit is distinguished from the latter unit by its coarser grain size and the presence of hornblende and large sphene. The Tuckaway Lake unit is a collection of metamorphosed intrusive sheets which fonn a narrow belt between the Battle Mountain and Lake Juanita leucogneiss units. This biotite tonalite gneiss is distinguished from the structurally lower Lake Juanita unit by its finer grain size (medium-grained), stronger foliation, and higher color index.

To the northwest view light-colored cliffs of the Hidden Lake Peak stock, a -75 Ma Oatest Cretaceous) biotite metagranodiorite. This small, slightly lensoid pluton intrudes the Napeequa unit with strong discordance. 7) Stop 5-8 Outcrops of Cascade River unit in the Chelan Mountains terrane. Plagioclase-rich muscovite schist, sericite-chlorite schist, and quartz-pebble metaconglomerate. The Cascade River follows the Entiat fault along this straight stretch. Here the fault separates metaclastites of the Cascade River unit from oceanic rocks of the Napeequa unit.

B. T-X(C0 2 ) plot for the system MgO-Si0 2 H2 0, showing how temperature of reaction varies with composition of mixed H2 0-C02 fluid phase. AND=andalusite, ANTH=anthophyllite, EN=enstatite, FO=forsterite, KY=kyanite, SIL=sillimanite, TC=talc. T307: 45 Clearly, at peak metamorphic conditions most Skagit gneisses would have been partially molten if water saturated; however, Clemens and Vielzeuf [1987] suggest that water saturation is unlikely in upper amphibolite facies rocks and that widespread melting would only occur above the dehydration-reaction curves of muscovite, biotite, or amphibole.

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