Coastal & Marine Geology InfoBank

USGS CMG InfoBank: Seaward Jump of Subduction Zone


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Comment: 14:37 - 15:08 (00:31)

Source: Annenberg/CPB Resources - Earth Revealed - 7. Mountain Building

Keywords: subduction, metamorphism, "igneous rock", continent, collision, seamount, island, trench, "convergent plate"

Our transcription: Because of their buoyancy, such fragments cannot be subducted; they merely become glued by metamorphism and igneous activity to the continents they collide with.

As this happens, the position of the subduction zone jumps to the seaward side of the added land mass.

Oceanic seamounts and islands also may not be subducted, being too thick to pass into the trench at the convergent boundary.

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Accessibility FOIA Privacy Policies and Notices
U.S. Department of the Interior \| U.S. Geological Survey URL: http://walrus.wr.usgs.gov/infobank/programs/html/school/moviepage/06.01.17.html Page Contact: InfoBank staff Page Last Modified: Tue Dec 16 06:30:20 PST 2008 (wcs)