GEOL 1010 Lecture Notes - Lecture 3: Mafic, Mid-Ocean Ridge, Seafloor Spreading
5 Sep 2016
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Document Summary
- because the nazca plate is subducting beneath south america. The quakes occur both along the subducting slab and in the overriding plate. Cross section: a two dimensional figure that is revealed when a two-dimensional place intersects with a three-dimensional figure or, what you see when you slice. Lithospheric slab subducting is at first cold but heats up as it subducts. It spreads slower on the east side of south america. No plate boundary on the east side of south america, it is a passive margin. Ocean lithosphere: the hot asthenosphere is at the base of the mid-ocean ridge, aging ocean crust moves away from this heat. Get the age of the volcanic rocks, measure the distance between the volcanoes. The volcano will continue to grow in the same spot. Continental rifting: continental lithosphere can break apart. Magma erupts: continuation can create a new mid ocean ridge, this process led to the breakup of pangaea.
