(also accretionary wedge)
A mass of sedimentary material scraped off a region of oceanic crust during subduction and piled up at the edge of the overriding plate.
- There is a continuing loss of some sediment into the mantle at subduction zones, although the ‘conveyor-belt’ system of plate tectonics ensures that most sediment is added to the accretionary wedge of the overriding plate.
- This assemblage is interpreted as the accretionary prism of an active continental margin.
- The most widely accepted view is that of an accretionary prism developed above an active subduction zone.
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Syllabification: ac·cre·tion·ar·y prism
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