Class Notes (1,100,000)
CA (650,000)
UTSC (30,000)
EESA06H3 (600)
Lecture 7

EESA06H3 Lecture 7: Lecture 7 (How Oceans Die)


Department
Environmental Science
Course Code
EESA06H3
Professor
Nick Eyles
Lecture
7

This preview shows pages 1-3. to view the full 17 pages of the document.
How Oceans Die: Part 2
The Tethys Ocean is dead: a geologic tour of the Alpine - Himalayan
Mountain Belt
Lecture Schedule
The Pacific Rim of Fire: Death of the Pacific Ocean
Tour around pacific rim
All about the death of the pacific ocean
Big picture -> converting ocean crust into continental crust
Primary role of pacific rim of fire is to consume and recycle oceanic crust
Comes back as continental crust
Continents that are surrounding pacific rim are moving in
Land masses are expanding in size because new material is being
added to the leading edges (active plate margins as a result of
Lecture 7 (How Oceans Die)
Monday, February 10, 2020
11:46 AM

Only pages 1-3 are available for preview. Some parts have been intentionally blurred.

added to the leading edges (active plate margins as a result of
subduction)
Ancient conditions where other oceans will close
Subduction: Converting Oceanic Crust Into Continental
Crust
The pacific basin
All oceanic crust produced by the mid ocean ridge
We are recycling oceanic crust into continental crust
Distinguishing characteristic of continental crust -> density
When you melt oceanic crust, you get magma that is more silica right
Lower density
Explosive volcanoes
Adding to the leading age of continents
Growing as a result of this
If you could come back after a few billion years, the continents will be bigger
Secretion process
Growing in size
North America is 70x the size it was 4 billion years ago

Only pages 1-3 are available for preview. Some parts have been intentionally blurred.

North America is 70x the size it was 4 billion years ago
Secretion process happens in the expense of oceans
Villarica and Llaima Volcanoes
Chile -> long skinny country
Big subduction zones off of shore
Volcanoes that occur on land
Old dead volcanoes but are not really dead -> tend to erupt
unexpectedly
Dormant and go up suddenly
New cones are growing
Old eroded cones are not exactly dead
Chaiten -> classic tale of old eroded volcano but one day, it decided to erupt
You're Reading a Preview

Unlock to view full version