EESA06H3 Lecture : EESA06 - Introduction to Planet Earth Lecture 2
16 Feb 2012
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Document Summary
Key things to remember (likely to come on the quiz) Continental" drift and pangaea - 1912 [alfred wegener] Formation of planet earth 4,500 million years before present. Sea floor spreading 1960 [harold hess] Magnetic stripes on the ocean floor and wander paths for continents 1965. Mid-ocean ridges and hot spots 1965 [tuzo wilson] Plate tectonics and wilson cycle 1967 [tuzo wilson] Redundant/incorrect term - continent do migrate/move but they do not drift independently of the large part of which they are a part of. Wegener proposed continents moved by plowing through the sea floor. Reconstructing the continents into laurasia and gondwana back together made sense in terms of: Striations: tell us the directions of ice flow; scratches and grooves made on ice when ice glaciers separate and move. Geochemistry of glacial sediments: looking for metals and minerals in and making sense of where the higher we are concentrations of metals/minerals are interested.
