Lecture 13
Table of Contents
- Tectonics and Surface Relief
- Why study surface relief?
- Why study surface relief?
- Why study surface relief?
- Why study surface relief?
- Why study surface relief?
- Why study surface relief?
- Why study surface relief?
- Why study surface relief?
- Above and Below sea level
- 13.1 Why are continents high and oceans low?
- 13.1 Why are continents high and oceans low?
- 13.1 Why are continents high and oceans low?
- 13.1 Why are continents high and oceans low?
- 13.1 Why are continents high and oceans low?
- 13.1 Why are continents high and oceans low?
- 13.1 Why are continents high and oceans low?
- 13.1 Why are continents high and oceans low?
- 13.2 How do we know ... that mountains have roots?
- 13.2 How do we know ... that mountains have roots?
- 13.2 How do we know ... that mountains have roots?
- 13.2 How do we know ... that mountains have roots?
- 13.3 How does isostasy relate to active geologic processes?
- 13.3 How does isostasy relate to active geologic processes?
- 13.3 How does isostasy relate to active geologic processes?
- 13.3 How does isostasy relate to active geologic processes?
- 13.3 How does isostasy relate to active geologic processes?
- Glacial Isostasy
- 13.3 How does isostasy relate to active geologic processes?
- 13.3 How does isostasy relate to active geologic processes?
- 13.3 How does isostasy relate to active geologic processes?
- 13.3 How does isostasy relate to active geologic processes?
- 13.4 Why does sea level change?
- 13.4 Why does sea level change?
- 13.4 Why does sea level change?
- 13.4 Why does sea level change?
- 13.4 Why does sea level change?
- 13.4 Why does sea level change?
- 13.5 How and where do mountains form?
- 13.5 How and where do mountains form?
- 13.5 How and where do mountains form?
- 13.5 How and where do mountains form?
- 13.5 How and where do mountains form?
- 13.5 How and where do mountains form?
- 13.5 How and where do mountains form?
- 13.6 How does mountain building relate to the growth of continents?
- 13.6 How does mountain building relate to the growth of continents?
- Non-Subductable Crust
- Non-Subductable Crust 2
- 13.6 How does mountain building relate to the growth of continents?
- 13.6 How does mountain building relate to the growth of continents?
- 13.6 How does mountain building relate to the growth of continents?
- Provinces of North America
- 13.6 How does mountain building relate to the growth of continents?
- 13.6 How does mountain building relate to the growth of continents?
- 13.6 How does mountain building relate to the growth of continents?
- Island Arcs
- 13.6 How does mountain building relate to the growth of continents?
Text and Images from Slide
- Most mountain belts form near convergent boundaries where crust thickens by compressional shortening and intrusion of magma.
- The hot lower-crustal root beneath high mountains is too weak to support the mass above. The crust spreads horizontally, producing normal faults in parts of the mountain belt, while contraction occurs elsewhere.
- The high elevations in the western U.S. do not have a thick crustal root, but are instead held up by unusually low-density mantle.
- Even as crustal thickening causes mountain uplift, thrust faults weigh down adjacent lowlands to form basins. These fill with sediments eroded from the mountains and contain fossil fuel resources.
- Mountains rise vertically at rates of 3-10 mm/yr, or only about 1/10 the rate of horizontal plate motion.
13.5 How and where do mountains form?