Continental Drift and Plate Tectonics

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Presentation transcript:

Continental Drift and Plate Tectonics

The Permian Ice Age Problem

Wegener’s Theory

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

The Geomagnetic Reversal Time Scale

Discovery of Sea-Floor Spreading

Sea-Floor Spreading

Where Does Ocean Crust Go? Hugo Benioff, 1954

Benioff’s Interpretation Updated

Worldwide Standardized Seismic Network

The Plate Tectonics Model

The Plate Tectonics Model

The Earth’s Plates

Global Plate Motions

What Drives It: Convection

How Plates Move

Reconstructing Plate Movements

Fit of Continents Across the Atlantic

Present Day Atlantic

Atlantic 65 m.y. ago

A Subduction Zone

Paleomagnetism

Why Mountains are High

Where the Plates Meet

Terrane Accretion

Terranes in Western North America

Hot Spots

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