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subduction |
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subduction [səb′dək·shən] (geology) The process by which one crustal block descends beneath another, such as the descent of the Pacific plate beneath the Andean plate along the Andean Trench. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| On the opposite end of a tectonic plate from its spreading zone may be a subduction zone, a span where two plates collide and one plate is forced beneath the other. Some are inaccessible, which explains why the genesis of carrier magmas is so poorly understood, especially in subduction settings. Seismicity in the Pacific Northwest is dominated by the subduction of the Juan de Fuca Plate beneath the North American Plate at a rate of about 42 mm/yr. |
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