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3 Cards in this Set
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Divergent(constructive) Continental-Continental - Rift Valleys plates move away, pushes up the lithosphere, lifting it and flowing lateral beneath it. At the crest overlaying plate stretched, thinned, broken, pulled apart. |
thicker plate arches up by currents, and the lithosphere is stretched to form horts and grabens of the rift. Earthquakes occur here. in the early process streams, rivers sink into the valley to long linear lakes later as the rift drop below sea lvl allowing ocean waters to flow. EAST AFRICA VALLEY (GREAT RIFT) 5,500km and 600m . 50m years, horn will break |
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divergent(constrcutive) oceanic-oceanic plates move away, pushes up the lithosphere, lifting it and flowing lateral beneath it. At the crest overlaying plate stretched, thinned, broken, pulled apart. divergent boundary beneath oceanic lithosphere, currents lift this between 2-3km creating mid-ocean ridge. forces stretch the lithosphere= deefp fissure. fissure opens and pressure reduces on superheated mantle material. magma solidifies process repeated |
MidAtlantic ridge north American and Eurasian- asthenosphere and lithosphere heated, expanded and elevated above surrounding sea floor. Magnetic stripes contribute to the pulling |
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Conservative/transform plates slide= transform fault=found in ocean basin and connect offsets in mid ocean ridges, a smaller number connect mid-ocean ridges and subductions zones transform faults=formed between two different plates, each moving away from spreading centre of divergent plate boundary |
a smaller number of transform faults cut continental lithosphere . most famous is the san andreas fault zone= connects a divergent boundary in the gulf of california and with the cascadia subduction zones. another example is the Alpine Fault, New Zealand |
