The Compressive Margin of the American Continents
Subduction of oceanic lithosphere under continental crust causes volcanic activity and uplift of compressive continental margins exemplified by the west coast of the American continents. The subsequent erosion of the uplifted continental margins has locally uncovered the plutonic rocks which form the roots of the volcanoes at the surface. Such tectonic processes have occurred throughout the history of the Earth and have produced igneous rocks whose ages range from Archean to Recent. Therefore, the continents have preserved a much more varied and extensive record of igneous activity than the present ocean basins whose ages do not exceed the Mesozoic Era.
KeywordsVolcanic Rock Lithospheric Mantle Mantle Wedge Crustal Rock Volcanic Zone
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