PlateTectonics

PlateTectonics - Plate Tectonics Continental Drift Alfred...

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Plate Tectonics Continental Drift Alfred Wegener Evidence Fit of continents Fossils Location of mountain ranges Glaciers Problems with Continental Drift theory Development of Technology World War II submarine warfare necessitated mapping of ocean floor Bathymetry Magnetic anomalies Age of rocks – radioactivity (radiometric age dating) Magnetism Earth’s magnetic field Magnetic field lines “Polar wandering” curves Reverses periodically Each rock has its own small magnetic field- indicator of magnetic field of the time Curie Point
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Magnetic reversals When plotted on a map of the ocean floor, looks like tire tread or stripes. Used with age of rock to construct a history of magnetic reversals. PLATE TECTONICS - Mid-ocean ridges first part of plate tectonic theory to be constructed. Recognized early on as site of importance Mountain range in middle of ocean Youngest rock in ocean Volcanic rock Magnetic stripes symmetrical about these linear ridges DIVERGENT BOUNDARY – 2 plates move away from each other, or diverge. At mid-ocean ridges:
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PlateTectonics - Plate Tectonics Continental Drift Alfred...

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