accretionary prism (əˈkriːʃənərɪ ˈprɪzəm)
accretionary wedge or accretionary prism
- (geology) a body of deformed sediments, wedge-shaped in two dimensions or prism-shaped in three
dimensions, that has been scraped off the surface of the oceanic lithosphere as it
moves downwards beneath a continent or island arc. The sediments are added to the
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