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Lecture 6B - Chapter 17 Continental Arc Magmatism Figure...

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Chapter 17: Continental Arc Magmatism Figure 17-10. Map of the Juan de Fuca plate- Cascade Arc system, after McBirney and White, (1982) The Cascade Province. In R. S. Thorpe (ed.), Andesites. Orogenic Andesites and Related Rocks . John Wiley & Sons. New York. pp. 115-136. Also shown is the Columbia Embayment (the western margin of pre-Tertiary continental rocks) and approximate locations of the subduction zone as it migrated westward to its present location (after Hughes, 1990, J. Geophys. Res. , 95, 19623-19638). Due to sparse age constraints and extensive later volcanic cover, the location of the Columbia Embayment is only approximate (particularly along the southern half). Winter (2001) An Introduction to Igneous and Metamorphic Petrology. Prentice Hall.
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CASCADE ARC Mt. Baker Mt. Rainier Mt. St. Helens Mt. Adams Mt. Hood Mt. Jeferson Crater Lake Mt. Shasta Mt. Lassen CASCADIA SUBDUCTION ZONE
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Mt. St. Helens KR 51 Mt. St. Helens, May 18, 1980
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off-scraped marine sediments accretionary wedge (older off-scraped sediments)
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