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Development of Continental Drift

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Plate Tectonics Continental Drift Evidence of Plate Tectonics Earth s Structure Plate Boundaries ... Day Atlantic Atlantic 65 m.y. ago Geology of Plate ... – PowerPoint PPT presentation

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Title: Development of Continental Drift


1
Development of Continental Drift
  • Frank Taylor (1910)
  • Alfred Wegener (1912) Die Entstehung Der
    Kontinente Und Ozeane

2
Plate Tectonics
  • Continental Drift
  • Evidence of Plate Tectonics
  • Earths Structure
  • Plate Boundaries
  • Hot Spots

3
The Permian Ice Age Problem
4
Frank Taylor
  • Recognized role of Mid-Atlantic Ridge
  • Never reconstructed the continents like Wegener
    did

5
Confirmation of Continental Drift
  • World War II technology
  • International Geophysical Year (IGY) 1957-58
  • Worldwide Standardized Seismic Network 1963-

6
The Geomagnetic Reversal Time Scale-Do Compass
and Magnet Experiment
7
Discovery of Sea-Floor Spreading
8
Sea-Floor Spreading
9
Where Does Ocean Crust Go?
  • Hugo Benioff, 1954

10
Benioffs Interpretation
11
Benioffs Interpretation Updated
12
Worldwide Standardized Seismic Network
13
The Plate Tectonics Model
14
The Plate Tectonics Model
15
The Earths Plates
16
Global Plate Motions
17
What Drives It Convection
18
How Plates Move
19
Reconstructing Plate Movements
20
Fit of Continents Across the Atlantic
21
Present Day Atlantic
22
Atlantic 65 m.y. ago
23
Geology of Plate Margins
24
Ophiolites Oceanic Crust
25
Plate Boundaries
  • Divergent
  • Can create volcanoes, earthquakes, and mountains
  • Examples Mid-Atlantic ridge, East Pacific Rise
  • Convergent
  • Can create volcanoes (continental and island
    arc), earthquakes, and mountains
  • Examples Juan De Fuca Plate and North America
    Plate
  • Transform
  • Can create strong shallow earthquakes and folded
    mountains
  • Examples San Andreas Fault

26
Anatomy of a Mid-Ocean Ridge
27
A Subduction Zone
28
Why Mountains are High
29
Where the Plates Meet
30
Terrane Accretion
31
Terranes in Western North America
32
Plate Boundaries and Earthquakes
33
Hot Spots
34
Hot Spots Hawaii
35
Pacific Hot Spot Tracks
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