EESA06H3 Lecture 6: Planet Earth (Lecture 6 & 7)
18 Jun 2017
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Chapter 2: the pacific rim lecture 6 and 7. When we destroy oceans, we produce new continental crust. Continent is made partially from recycled continental crust. (augusto gansser discovered this the father of himalayan geology) Accretionary wedge when sediments are scraped off from oceanic crust and are piled up in the trenches. They contain a lot of oil and gas. Pangea: ocean widens till a point, then contracts. Continents closed together to seal up tethys ocean. 1 billion years ago, oceans were closing to form rodina. Obducted: when ocean crust gets pushed on top of the continents. Colliding continents together, and remnants of oceanic crust is trapped between the two. There are earthquakes but no volcanoes b/c there"s no pushing down of one plate. Ophiolite - ancient ocean crust/ ancient ocean basalt. The rock has changed because it was in the collision zone. Plutons (granite) crustal melting produces this rock.
