Kinds of Convergence Zones

When a denser oceanic plate collides with a continental plate, the ocean plate goes under the continental plate. A great deal of energy is dissipated at the collisional interface which results in the melting of the continental crust. The surface manifestation of a subduction zone is active vulcanism. The kinds of volcanoes which can occur depends on the chemical composition of the magma which determines its viscosity. There are basically three types of flows:

Detailed diagrams of the subduction process are shown below. In the case of oceanic-oceanic plate subduction still occurs and volcanism rsults. For continental-continental plate collisions there is no subduction and hence no volcanism but just general uplift. The Himalayan mountain range formed in this manner.

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