Continental drift: An idea before its time. Pangaea approximately 200 million years ago. Continental drift: An idea before its time
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1 Chapter 2 Plate Tectonics: A Scientific Revolution Unfolds Continental drift: An idea before its time Alfred Wegener Figure 2.3 First proposed his continental drift hypothesis in 1915 Published The Origin of Continents and Oceans Continental drift hypothesis Supercontinent called Pangaea began breaking apart about 200 million years ago Banff National Park, Alberta, Canada Pangaea approximately 200 million years ago Continental drift: An idea before its time Continental drift hypothesis Continents "drifted" to present positions Evidence used in support of continental drift hypothesis Fit of the continents Fossil evidence Rock type and structural similarities Paleoclimatic evidence Figure 2.2 Figure 2.4 Matching mountain ranges Figure 2.6 1
2 The great debate Objections to the continental drift hypothesis Paleoclimatic evidence c.f. 2.7 Data from the forms and materials of the Ocean Floor: extensive mapping of the ocean floor during the 1950s and 1960s Seafloor spreading hypothesis, Harry Hess in the early 1960s Lack of a mechanism for moving continents (a good hypothesis must be consistent with the basic principles of physics) Wegener incorrectly suggested that continents broke through the ocean crust, much like ice breakers cut through ice Strong opposition to the hypothesis from all areas of the scientific community (particularly among American scientists) Data from Earth s magnetic field Renewed interest in Figure 2.8 continental drift initially came from rock magnetism Magnetized minerals in rocks Show the direction to Earth s magnetic poles Provide a means of determining their latitude of origin Note abyssal plains, spreading ridges, seamounts, and trenches the ocean floor is YOUNG (see p. 46). Figure 2.9 and 2.10 Inclinations of Earth s magnetic field with latitude 1.17 Magnetic Field Data: Apparent Polar wandering The apparent movement of the magnetic poles illustrated in magnetized rocks indicates that the continents have moved Figure
3 Magnetic Field Reversals Geomagnetic reversals Earth's magnetic field periodically reverses polarity the north magnetic pole becomes the south magnetic pole, and vice versa 2.8, 2.13, 2.14 Geomagnetic reversals are recorded in the ocean crust In 1963 Vine and Matthews tied the discovery of magnetic stripes in the ocean crust near ridges to Hess s concept of seafloor spreading Figure Figure 2.15 Plate Tectonic Theory arose as an explanation of all the data used to propose the (incomplete) hypotheses of continental drift and sea floor spreading. Figure
4 Plate Tectonic Theory: Earth s lithosphere is divided into seven major plates (and a number of smaller plates) that move relative to each other and overlie the asthenosphere. Earth s tectonic plates, with divergent, convergent, and transform boundaries. Figure 2.12 Figure 2.20 Divergent plate boundaries Most are located along the crests of oceanic ridges Oceanic ridges and seafloor spreading 2.21 Divergent plate boundaries Continental rifting Splits landmasses into two or more smaller segments along a continental rift Examples include the East African rift valleys and the Rhine Valley in northern Europe Produced by extensional forces acting on lithospheric plates Along welldeveloped divergent plate boundaries, the seafloor is elevated forming oceanic ridges Convergent plate boundaries Figure 2.22 Figure 2.24 Older portions of oceanic plates are returned to the mantle in these destructive plate margins Surface expression of the descending plate is an ocean trench Also called subduction zones Average angle of subduction = 45 Figure
5 Transform fault boundaries Plates slide past one another and no new lithosphere is created or destroyed Transform faults Figure 2.25 Figure 2.26 Plates slide past one another and no new lithosphere is created or destroyed Transform faults Most join two segments of a mid-ocean ridge along breaks in the oceanic crust known as fracture zones A few (the San Andreas fault and the Alpine fault of New Zealand) cut through continental crust Most join two segments of a midocean ridge along breaks in the oceanic crust known as fracture zones A few (the San Andreas fault and the Alpine fault of New Zealand) cut through continental crust Testing plate tectonics: birth of a new theory Evidence from ocean drilling Some of the most convincing evidence confirming seafloor spreading has come from drilling directly into ocean-floor sediment Age of deepest sediments Thickness of ocean-floor sediments verifies seafloor spreading Transform fault boundaries Testing the plate tectonics model Hot spots and mantle plumes Global Marine, a Hughes company, commissioned the Glomar Challenger and Glomar Explorer in Caused by rising plumes of mantle material Volcanoes can form over them (Hawaiian Island chain) Mantle plumes Long-lived structures Some originate at great depth, perhaps at the mantle-core boundary Box 2.4 and fig Figure 2.28 The JOIDES Resolution Measuring plate motion What drives plate motions? Researchers agree that convective flow in the mantle is the basic driving force of plate tectonics Very Long Baseline Interferometry (VLBI) Global Positioning System (GPS) Figure 2.30 Figure 2.29, 2.30 Forces that drive plate motion Slab-pull Ridge-push Slab suction 5
6 Models of plate-mantle convection Any model must be consistent with observed physical and chemical properties of the mantle Models Layering at 660 kilometers Whole-mantle convection Deep-layer model Figure 2.32 Importance of plate tectonics The theory provides explanations for Earth s major surface processes; The geologic distribution of earthquakes, volcanoes, and mountains; The distribution of ancient organisms, fossil fuels and mineral deposits; Plate tectonics is the central unifying theory of Earth s geology, and provides context for interpreting Earth s history including climate change. Matter and Minerals 6
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