View
6
Download
0
Category
Preview:
Citation preview
11/5/2012
1
11/5/2012
2
Continental Drift
Oceanic Ridges
11/5/2012
3
Deep Sea Trenches
11/5/2012
4
11/5/2012
5
Sea Floor Spreading (SFS) proposed in early 1960’s How do we test SFS?
11/5/2012
6
Figure 2.17 Figure 2.18
Fig. 12-11, p.342
SFS: why it looks good:Distribution of Igneous Activity & Seismic EventsAge Dating basalt and marine fossilsSediment ThicknessMagnetic Anomalies, Heat FlowSequence of Sediments off Passive Continental Margins
11/5/2012
7
11/5/2012
8
Plate TectonicsFigure 2.23
3 General types of Plate Boundaries
Divergent
ConvergentMany variations
Transcurrent orTransform
Figure 2.24
Divergent
Figure 2.25
11/5/2012
9
Convergent: Oceanic to Continental
Convergent: Oceanic to OceanicConvergent: Continental Collision
11/5/2012
10
Figure 2.23
Transform or Transcurrent
Transform
11/5/2012
11
Global Seismic Activity over ~20 year span
11/5/2012
12
11/5/2012
13
11/5/2012
14
Recommended