lec 11 - GE105 Continents Adrift The temperature inside the...

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Unformatted text preview: GE105 Continents Adrift The temperature inside the Earth Earth’s temperature drops only about 100 oC per billion years. Asthenosphere : (100-300 km) layer directly beneath mobile tectonic plates where the temperature approaches the melting temperature. Outer core : (2890-5100 km) molten layer of iron alloy where magnetic field originates Inner core : (5100-6370 km) solid iron GE105 11 Continents Adrift MOLTE N GE105 Continents Adrift The mantle plume GE105 22 Continents Adrift GE105 Continents Adrift Plate motion over a fixed hotspot GE105 33 Continents Adrift PLATE MOTION OVER THE MANTLE GE105 Continents Adrift Eruptions of plumes begin with flood basalt GE105 44 Continents Adrift Deccan, India GE105 Continents Adrift Flood basalt provinces in the world Rapid (< few million years) outpour of massive volumes of basalts • Initiation of continental break-up • Life extinction GE105 55 Continents Adrift 250 Ma 66 Ma 17 Ma 122 Ma GE105 Continents Adrift Massive volcanism and mass extinctions GE105 66 Continents Adrift The permian-triassic boundary: 90% of species went extinct GE105 Continents Adrift Plate motion over a fixed hotspot GE105 77 Continents Adrift GE105...
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This note was uploaded on 02/17/2011 for the course GEOSCI 105 taught by Professor Ritsema during the Winter '11 term at University of Michigan.

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lec 11 - GE105 Continents Adrift The temperature inside the...

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