ESS 101 Chapter Notes - Chapter 7: Cascadia Subduction Zone, Himalayas, Volcanic Arc
27 Feb 2017
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Obviously the earth is not getting bigger with the creation of new ocean lithosphere, thus it makes sense that the ocean lithosphere must be consumed along convergent boundaries. Ocean crust is composed of basaltic crust because it is made out of partially melted asthenosphere: partial melt has a different. Granite is a partial melt of the continental crust: granite generally has pink crystals. Ocean-ocean lithosphere convergence (subduction: examples: japan and the philippines. Ocean-continental lithosphere convergence (subduction: examples: andes mountains and the. Cascade mountains: basalt is denser than the continental crust, thus it will be the one subducted. Continent-continent lithosphere collision (no subduction: examples: himalaya. Ridge push, plate sliding (highest point on the ridge, thus the ocean lithosphere may be sliding to the base), or slab pull. Diagram on right is an example like the cascadia subduction zone. Forearc basin = puget lowland: does not have to be below sea level, i. e. willamette valley in oregon.
