By L. J. Patrick Muffle, Charles R. Bacon, Robert L. Christiansen, Michael A. Clynne, J. M. Donnelly?Nolan, D. R. Sherrod, J. C. Sm
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Published through the yankee Geophysical Union as a part of the Field journey Guidebooks Series.
The Cascade diversity is a overdue Tertiary and Quternary volcanic arc that extends north from northeastern California via Oregon and Washington into British Columbia. The volcanic arc lies above an easterly dipping lively subduction area alongside which the Juan de Fuca, Gorda, and Explorer plates are thrust underneath the North American Plate (Riddington, 1984). as well as the most important composite volcanoes that experience erupted andesites, dacites, or even rhyolites, there are numerous smaller, quite often monogenetic vents that erupted basically calc-alkaline basalt and basaltic andesites during the historical past of the arc (McBirney, 1978; Luedke and Smith, 1981, 1982; Smith and Luedke, 1984; Guffanti and Weaver, 1988). The volcanic arc is energetic, with yes ancient eruptions at Lassen height (1914-17) and Mount St. Helens (mid-1800's; 1980-86), and attainable historical eruptions at Mt. Shasta (1786), Mt. Baker (mid-1800's), Mt. Hood (mid-1800's), Mt. Rainier (mid-1800's) and Cinder Cone (east of Lassen top; 1851?).
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