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Continental Drift and Plate Tectonics

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Continental Drift and Plate Tectonics The Permian Ice Age Problem Wegener s Theory Confirmation of Continental Drift World War II technology International ... – PowerPoint PPT presentation

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Title: Continental Drift and Plate Tectonics


1
Continental Drift and Plate Tectonics
2
The Permian Ice Age Problem
3
Wegeners Theory
4
Confirmation of Continental Drift
  • World War II technology
  • International Geophysical Year (IGY) 1957-58
  • Worldwide Standardized Seismic Network 1963-

5
The Geomagnetic Reversal Time Scale
6
Discovery of Sea-Floor Spreading
7
Sea-Floor Spreading
8
Where Does Ocean Crust Go?
  • Hugo Benioff, 1954

9
Benioffs Interpretation Updated
10
Worldwide Standardized Seismic Network
11
The Plate Tectonics Model
12
The Plate Tectonics Model
13
The Earths Plates
14
Global Plate Motions
15
What Drives It Convection
16
How Plates Move
17
Reconstructing Plate Movements
18
Fit of Continents Across the Atlantic
19
Present Day Atlantic
20
Atlantic 65 m.y. ago
21
A Subduction Zone
22
Paleomagnetism
23
Why Mountains are High
24
Where the Plates Meet
25
Terrane Accretion
26
Terranes in Western North America
27
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