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Convergent boundary
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== Accretionary wedge == {{See also|Accretionary wedge}} Accretionary wedges (also called [[accretionary prism]]s) form as sediment is scraped from the subducting lithosphere and emplaced against the overriding lithosphere. These sediments include igneous crust, turbidite sediments, and pelagic sediments. Imbricate thrust faulting along a basal decollement surface occurs in accretionary wedges as forces continue to compress and fault these newly added sediments.<ref name=":0" /> The continued faulting of the accretionary wedge leads to overall thickening of the wedge.<ref>{{Cite journal|last1=Konstantinovskaia|first1=Elena|last2=Malavieille|first2=Jacques|date=2005-02-01|title=Erosion and exhumation in accretionary orogens: Experimental and geological approaches|journal=Geochemistry, Geophysics, Geosystems|volume=6|issue=2|pages=Q02006|doi=10.1029/2004GC000794|issn=1525-2027|bibcode=2005GGG.....6.2006K|s2cid=128854343|url=http://ntur.lib.ntu.edu.tw/bitstream/246246/54873/1/ntu-96-R88224210-1.pdf}}</ref> Seafloor topography plays some role in accretion, especially emplacement of igneous crust.<ref>{{Cite journal|last1=Sharman|first1=George F.|last2=Karig|first2=Daniel E.|date=1975-03-01|title=Subduction and Accretion in Trenches|journal=GSA Bulletin|volume=86|issue=3|pages=377β389|doi=10.1130/0016-7606(1975)86<377:SAAIT>2.0.CO;2|issn=0016-7606|bibcode=1975GSAB...86..377K}}</ref>
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