GEOL 1120 Lecture Notes - Lecture 19: North American Plate, Convergent Boundary, Eurasian Plate
2 Dec 2018
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Document Summary
First, ocean crust-and-mantle of the north american plate went down the trench. Eventually, the continental rock itself reached the trench and jammed it, like a bagel in a toaster. Earth"s tectonic history can be inferred from magnetic measurements on old rocks. The last supercontinent, pangea, coalesced at 300 million years ago. Plate boundaries are classified by relative motion (convergent, divergent, and transform) Plate boundaries are classified by plate type (ocean-ocean, continent-continent, ocean-continent) Three types of plate boundaries: convergent, divergent, and transform. At divergent plate boundaries, plates move apart. Most (not all) divergent boundaries are in ocean crust. Gap between eurasian and north american plates. Fissure zone of the mid-atlantic ridge near thingvellir, iceland. North american plate at right, eurasian plate at left. Building marks the site of logberg, iceland"s first parliament, founded in. Divergent plate boundaries have high heat fluxes, where hydrothermal vents emit hot water and nutrients. At convergent plate boundaries, plates move toward each other.
