Editing Obduction (section)

===Compressional telescoping onto Atlantic-type continental margins===
The simplest form of this type of obduction may follow from the development of a subduction zone near the continental margin. Above and behind the subduction zone, a welt of oceanic crust and mantle rides up over the descending plate. The ocean, intervening between the [[continental margin]] and the subduction zone is progressively swallowed until the continental margin arrives at the subduction zone and a giant wedge or slice ([[nappe]]) of oceanic crust and mantle is pushed across the continental margin.{{Citation needed|date=August 2012}} Because the buoyancy of the relatively light continental crust is likely to prohibit its extensive subduction, a flip in subduction polarity will occur yielding an ophiolite sheet lying above a descending plate.{{citation needed|date=February 2014}}

If however, a large tract of ocean intervenes between the continental margin the subduction zone, a fully developed arc and [[back-arc basin]] may eventually arrive and collide with the continental margin. Further convergence may lead to overthrusting of the volcanic arc assemblage and may be followed by [[Subduction polarity reversal|flipping of the subduction polarity]]. According to the rock assemblage as well as the complexly deformed ophiolite [[Basement (geology)|basement]] and arc intrusions, the Coastal Complex of western Newfoundland may well have been formed by this mechanism.<ref name="Dewey" />