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Obduction
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===Upwedging in subduction zones=== This process is operative beneath and behind the inner walls of [[oceanic trench]]es (subduction zone) where slices of oceanic crust and mantle are ripped from the upper part of the descending plate and wedged and packed in high pressure assemblages against the leading edge of the other plate.<ref name="Dewey">Dewey, J. F., 1976. Ophiolite Obduction. Tectonophysics, v. 31, p.93-120.</ref> Weakening and cracking of oceanic crust and upper mantle is likely to occur in the tensional regime. This results in the incorporation of ophiolite slabs into the overriding plate.<ref name="Dewey" /> Progressive packing of [[ophiolite]] slices and arc fragments against the leading edge of a continent may continue over a long period of time and lead to a form of continental [[Accretion (geology)|accretion]].
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