Download E-books South Cascades Arc Volanism, California and Southern Oregon: Red Bluff to Redding, California, July 20-26, 1989 PDF
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 via the yank Geophysical Union as a part of the Field journey Guidebooks Series.
The Cascade variety 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 energetic subduction quarter 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, more often than not monogenetic vents that erupted basically calc-alkaline basalt and basaltic andesites during the background 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 top (1914-17) and Mount St. Helens (mid-1800's; 1980-86), and attainable ancient 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?).