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accretionary wedge

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accretionary wedge, prism
n
(Earth Sciences / Geological Science) 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 continental edge


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From the information recorded in the cores, the research team can draw conclusions on the mechanics of the accretionary wedge.
The closing of ocean basins through subduction means that the ultimate fate of these turbidite sequences is to be highly fragmented and deformed in subduction zone accretionary wedges and eventually to form part of collisional orogenic belts, and become welded into the crystalline metamorphic fabric of continental crust.
The Barga Terrane is interpreted as having formed in ocean-margin environment with active island-and-Andean type magnetic arcs, rifted basis, accretionary wedges and continental margins.
 
 
 
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