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Lecture

Lecture 3

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Department
Environmental Science
Course Code
EESA06H3
Professor
Nick Eyles

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Lecture 3 EESA06
Modern planet Earth evolving as we speak, plates moving and stuff like that
Earth history all about history of the oceans
Examine how oceans form
How Continents Break Up
Diagrams
A.Doming (inflation), like Pangea
Dome because there is a plume of hot mantle plastic rock rising underneath supercontinent,
it is being pushed up because of warming and develops a triple junction
B.Triple junction- 3 major fractions
Each arms is called a rift
Along the floor of the rift is usually going down, called subsiding
C.The evolution of the triple junction, only one rift opens up- only one rift develops into an ocean, we
called the others failed rifts.
Usually fill up in sediments, they have fine organic materials
Failed Rifts
Failed rifts are preserved in modern continents from the breakup of Pangea
The Ottawa river valley, the St. Lawrence river valley, both are examples of failed rifts
They control where large rivers flow
They generate earthquakes
Ottawa (rock and roll of Canada) because there are earthquakes there
(diagram) Stage 1: East African Rift
Rift that is widening and is growing along centre what will become a mid ocean ridge
Most of East Africa is at stage 1
Stage 2: Red Sea
Along Egypt
Difference between a sea and an ocean is that ocean has a mid ocean ridge along its centre line.
Oceans are widening all the time and seas dont
Red sea is a little embryonic ocean that one day will widen
East African Rift System
Where African plate is being torn apart and there is the East African plume underneath that is
impacting base of crust and pulling it apart
Horn of African which is called the Somalian plate is going to break away from Africa and become
a little continental crust
Triple junction is the Red Sea and Gulf of Aden
oOne of those will become an ocean and the others will be the failed arms
Location of major triple junction
Red box on map
Plates
If we are opening up a new ocean, focusing plates apart
The Arabian plate
oIf open up Red sea, Arabian plate being pushed north
oThe dark black line with teeth on it are big mountains being pushed up by Arabian plates
moving northwards and colliding with Europe
By opening oceans, we are moving plates around
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Description
Lecture 3 EESA06 Modern planet Earth evolving as we speak, plates moving and stuff like that Earth history all about history of the oceans Examine how oceans form How Continents Break Up Diagrams A. Doming (inflation), like Pangea Dome because there is a plume of hot mantle plastic rock rising underneath supercontinent, it is being pushed up because of warming and develops a triple junction B. Triple junction- 3 major fractions Each arms is called a rift Along the floor of the rift is usually going down, called subsiding C. The evolution of the triple junction, only one rift opens up- only one rift develops into an ocean, we called the others failed rifts. Usually fill up in sediments, they have fine organic materials Failed Rifts Failed rifts are preserved in modern continents from the breakup of Pangea The Ottawa river valley, the St. Lawrence river valley, both are examples of failed rifts They control where large rivers flow They generate earthquakes Ottawa (rock and roll of Canada) because there are earthquakes there (diagram) Stage 1: East African Rift Rift that is widening and is growing along centre what will become a mid ocean ridge Most of East Africa is at stage 1 Stage 2: Red Sea Along Egypt Difference between a sea and an ocean is that ocean has a mid ocean ridge along its centre line. Oceans are widening all the time and seas dont Red sea is a little embryonic ocean that one day will widen East African Rift System Where African plate is being torn apart and there is the East African plume underneath that is impacting base of crust and pulling it apart Horn of African which is called the Somalian plate is going to break away from Africa and become a little continental crust Triple junction is the Red Sea and Gulf of Aden o One of those will become an ocean and the others will be the failed arms Location of major triple junction Red box on map Plates If we are opening up a new ocean, focusing plates apart The Arabian plate o If open up Red sea, Arabian plate being pushed north o The dark black line with teeth on it are big mountains being pushed up by Arabian plates moving northwards and colliding with Europe By opening oceans, we are moving plates around www.notesolution.com
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