EESA06H3 Lecture Notes - Lecture 2: Frederick Vine, Continental Drift, Plate Tectonics
3 Feb 2018
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Document Summary
How planet earth evolves: continental drift vs plate tectonics. Formation of planet earth: 4,500 million years before present. Wegener proposed that continents moved by plowing through the sea oor which he called. This hypothesis was rejected by most geologists. Pangea consists of: laurasia (n. america & asia) & gondwana (southern continents) Matching rock types of the same age from one continent toanother to reconstruct supercontinent. And it made sense of the fossil record on continents that are now far apart. Harold hess introduced idea of sea oor spreading (1962) Sea oor created at mor"s recycled into mantle at trenches. Magnetic stripes" on the ocean oor and wander paths" for continents: 1965 (fred vine) Mid-ocean ridges and hot spots": 1965 (tuzo wilson) Introduces the theory of plate tectonics in 1967. Magnetic stripes (1965)the vines, mathews, drummond hypothesis magnetometer surveys of ocean oor identi ed patterns of anomalies on each side of mors. Paleomagnetism: episodically the earth"s magnetic eld ips.
