| Convergent Boundary |
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| plate tectonics | |
| SHOPPER'S DELIGHT | |
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The motion of two plates toward one another forms either a Subduction Zone or a Continental Collision . This depends on the nature of the plates involved. CONVERGENT MARGINS A Subduction Zone forms at a convergent plate boundary when one or both of the tectonic plates is composed of Oceanic Crust . The less dense plate usually rides over the denser plate, which is subducted. This type of plate convergence is associated with Island Arc s such as the Solomon Islands . The island arc is formed above the subduction zone within the over-riding plate, with a deep Oceanic Trench formed by warping of the crust. When one plate is composed of oceanic crust and the other is composed of Continental Crust , the oceanic plate is subducted, forming an Orogenic Belt and associated mountain range, often with an oceanic trench offshore. This type of convergent boundary is similar to the Andes or the Cascade Range s in North America. When two plates containing continental crust collide, both are too light to subduct. In this case, a continent-continent collision occurs, creating especially large mountain ranges. The typical example of this is the Himalayas . Occasionally plate convergent boundaries are involved with complex faulting and can form Transform Plate Boundaries , where some component of Strike-slip Faulting is involved at a zig-zag section of the plate boundary. The best example of this is the New Zealand convergent margin, where convergent action is occurring intermixed with a strike-slip boundary. Examples
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