EESA06H3 Lecture Notes - Lecture 2: Magnetometer, Oceanic Crust, Pacific Plate
Document Summary
Formation of planet earth 4,500 million years before present. Magnetic stripes on the ocean floor and wander paths for continents: 1965 (fred vine) Mid-ocean ridges and hot spots: 1965 (tuzo wilson) Plate tectonics and wilson cycle: 1967 (tuzo wilson) Wegener proposed that continents moved by plowing through the sea floor. This hypothesis was rejected by most geologists (southern geologists tended to accept it with northern did not) Laurasia (n. america & asia: gondwana (southern continents) Wegener argued that it had broken up & continents had drifted. Matching rock types of the same age from one continent to another. They get lithified (cemented) to turn to stone so in the ancient record we can look at ancient rocks & identify their apparent climate. What wegener did is he put the continents together & plotted the different rock types & it made sense because they reconstructed the former climate times.
