lecture12
Table of Contents
- Global Tectonics: Plates and Plumes
- Why study plates and their motions?
- Why study plates and their motions?
- Why study plates and their motions?
- Why study plates and their motions?
- Why study plates and their motions?
- Why study plates and their motions?
- Why study plates and their motions?
- Why study plates and their motions?
- Why study plates and their motions?
- Why study plates and their motions?
- Why study plates and their motions?
- Continental Drift
- Why study plates and their motions?
- 12.1 How does continental drift relate to plate tectonics?
- 12.1 How does continental drift relate to plate tectonics?
- 12.1 How does continental drift relate to plate tectonics?
- 12.2 What is the evidence that plates are rigid?
- 12.2 What is the evidence that plates are rigid?
- 12.2 What is the evidence that plates are rigid?
- 12.2 What is the evidence that plates are rigid?
- 12.2 What is the evidence that plates are rigid?
- 12.2 What is the evidence that plates are rigid?
- 12.2 What is the evidence that plates are rigid?
- 12.2 What is the evidence that plates are rigid?
- 12.2 What is the evidence that plates are rigid?
- 12.2 What is the evidence that plates are rigid?
- 12.2 What is the evidence that plates are rigid?
- 12.2 What is the evidence that plates are rigid?
- 12.3 What is the evidence that plates move apart at divergent plate boundaries?
- 12.3 What is the evidence that plates move apart at divergent plate boundaries?
- 12.3 What is the evidence that plates move apart at divergent plate boundaries?
- 12.3 What is the evidence that plates move apart at divergent plate boundaries?
- 12.3 What is the evidence that plates move apart at divergent plate boundaries?
- Age of Crusts
- Magnetic Record of Seafloors
- 12.3 What is the evidence that plates move apart at divergent plate boundaries?
- 12.3 What is the evidence that plates move apart at divergent plate boundaries?
- 12.3 What is the evidence that plates move apart at divergent plate boundaries?
- Seismic Tomography Data
- Rift Valleys
- Forming Seas
- 12.3 What is the evidence that plates move apart at divergent plate boundaries?
- 12.3 What is the evidence that plates move apart at divergent plate boundaries?
- 12.4 What is the evidence that subduction occurs at convergent plate boundaries?
- 12.4 What is the evidence that subduction occurs at convergent plate boundaries?
- 12.4 What is the evidence that subduction occurs at convergent plate boundaries?
- 12.4 What is the evidence that subduction occurs at convergent plate boundaries?
- 12.4 What is the evidence that subduction occurs at convergent plate boundaries?
- 12.4 What is the evidence that subduction occurs at convergent plate boundaries?
- 12.4 What is the evidence that subduction occurs at convergent plate boundaries?
- Seismic Tomography
- 12.4 What is the evidence that subduction occurs at convergent plate boundaries?
- 12.4 What is the evidence that subduction occurs at convergent plate boundaries?
- 12.4 What is the evidence that subduction occurs at convergent plate boundaries?
- 12.4 What is the evidence that subduction occurs at convergent plate boundaries?
- Convergent Plate Boundaries
- 12.4 What is the evidence that subduction occurs at convergent plate boundaries?
- 12.4 What is the evidence that subduction occurs at convergent plate boundaries?
- 12.5 What is the evidence that plates slide past one another at transform plate boundaries?
- Fault Displacement
- 12.5 What is the evidence that plates slide past one another at transform plate boundaries?
- 12.5 What is the evidence that plates slide past one another at transform plate boundaries?
- 12.5 What is the evidence that plates slide past one another at transform plate boundaries?
- 12.6 What does the mantle-plume hypothesis explain that plate tectonics cannot explain?
- 12.6 What does the mantle-plume hypothesis explain that plate tectonics cannot explain?
- 12.6 What does the mantle-plume hypothesis explain that plate tectonics cannot explain?
- 12.6 What does the mantle-plume hypothesis explain that plate tectonics cannot explain?
- 12.6 What does the mantle-plume hypothesis explain that plate tectonics cannot explain?
- 12.6 What does the mantle-plume hypothesis explain that plate tectonics cannot explain?
- 12.6 What does the mantle-plume hypothesis explain that plate tectonics cannot explain?
- 12.7 How do we know ... that plates move in real time?
- 12.7 How do we know ... that plates move in real time?
- Global Plate Motion
- 12.7 How do we know ... that plates move in real time?
- 12.7 How do we know ... that plates move in real time?
- Measurements and Predictions
- 12.7 How do we know ... that plates move in real time?
- 12.7 How do we know ... that plates move in real time?
- 12.8 What forces cause plate motions and plumes?
- 12.8 What forces cause plate motions and plumes?
- 12.8 What forces cause plate motions and plumes?
- 12.8 What forces cause plate motions and plumes?
- 12.8 What forces cause plate motions and plumes?
- 12.9 What were the consequences of plate motion over geologic time?
- 12.9 What were the consequences of plate motion over geologic time?
- 12.9 What were the consequences of plate motion over geologic time?
- 12.9 What were the consequences of plate motion over geologic time?
- 12.9 What were the consequences of plate motion over geologic time?
- 12.9 What were the consequences of plate motion over geologic time?
- 12.9 What were the consequences of plate motion over geologic time?
- 12.9 What were the consequences of plate motion over geologic time?
- 12.9 What were the consequences of plate motion over geologic time?
- 12.9 What were the consequences of plate motion over geologic time?
Text and Images from Slide
12.8 What forces cause plate motions and plumes?
- Plate motions and plumes are convection.
- Downwelling at convergent boundaries:
- Determines the speed and direction of plate motion.
- Gravity pulls the dense, subducted slab down.
- Most of the remaining driving force is due to slab suction caused by the downward pull.
- Debate continues over seismic tomography and whether it accurately depicts (Fig. 12.42) deep mantle penetration.