Ch.3 Plate Tectonics - continents. 23 Tectonic Plates 24...

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1 Chapter 3 Plate Tectonics: A Unifying Theory
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2 Alfred Wegener (1880-1930) Alfred Wegener: The Origins of  Continents and Oceans (1915).
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3 Wegener’s Image of Pangaea
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4 Continental Drift Matching coastlines, rock assemblages
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5 Evidence for Plate Tectonics
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6 Glacial Deposits
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7 Evidence for Plate Tectonics
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8 Glossopteris Fauna, Upper Permian, AUS
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9 Distribution of Climatic Belts
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10 Continental Drift - Fossils
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11 Mid-Atlantic Ridge
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12 Echo Sounding
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13 Earth’s magnetic field
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14 Apparent polar wandering
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15 Magnetic Reversals
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16 Magnetic reversals, lava flows on land
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17 Harry Hess (1906-1969) Harry Hess (Photograph courtesy of  Department of Geological and  Geophysical Sciences,  Princeton University.) “History of Ocean Basins” (1962) Conveyor belt-like movement of the seafloor.
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18 Sea-floor Spreading
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19 Magnetic Reversals/Anomalies
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20
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21
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22 Evidence for Sea-Floor Spreading Presence of mid-ocean ridges (MOR). Increasing sediment thickness away from MOR. Decreasing heat flow away from MOR. Ocean floor is youngest at MOR and oldest close to the
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Unformatted text preview: continents. 23 Tectonic Plates 24 Earths Plates Today 25 Types of Plate Boundaries 26 Divergent Plate Boundaries 27 28 29 30 31 Divergent Plate Boundaries 32 Divergent Plate Boundaries 33 Divergent Plate Boundaries 34 Divergent Plate Boundaries 35 Triassic fault-block basin 36 Palisades, Hudson River 37 Convergent Plate Boundaries 38 Oceanic-Oceanic plate boundary, Japan 39 Oceanic-Continental plate boundary, Andes Mts. 40 Continental-continental plate boundary, Himalayas 41 Ophiolite 42 Transform Boundaries 43 Fig. 3-20, p. 47 44 Transform plate boundary 45 Hot Spots 46 47 Hot Spot Track Direction and Speed of plate motion 48 Reconstructing plate positions using magnetic anomalies 49 Rates of Plate Motion Satellite Laser Ranging 50 More on Plate Tectonics 51 Thermal convection cells 52 Slap-pull, ridge-push 53 Causes of Plate Motio n 54 Isthmus of Panama 55 Copper deposits 56 The Great Reconstruction 57 58 59 60 61 62 63 64 65 66...
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Ch.3 Plate Tectonics - continents. 23 Tectonic Plates 24...

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