ESS105H1 Study Guide - Final Guide: Metamorphic Rock, Continental Collision, Continental Crust
29 Jun 2016
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Convergent boundaries: form when 2 plates move toward each other (oceanic trenches, island arcs & large mountain belts) Convergence of 2 oceanic plates forms ocean-ocean convergent boundary. Convergence of oceanic & continental plate form ocean- continent convergent boundary (denser oceanic plate subduct under continental plate) Convergence of 2 continents called continental collision. Transform boundaries: plates slip horizontally past one another (associated with mid ocean ridges & can link other plate boundaries together) Plates move because of: slab pull, ridge push & mantle convection. Burial: increasing pressure experienced by rock by adding material. Burial during subduction occurs when cool rocks from surface are brought to higher pressure & temp. Regional metamorphism (high temp. /moderate pressures): intrusion of magma chambers heat continental crust driving chemical reactions & changing mineralogy of rocks. During mountain building, rocks thrust upon one another. & buried & can change texture/minerology of rocks (moderate temp & pressure metamorphism)
