Folding and Faulting Flashcards
Explain the global distribution of fold mountains
Check notes
Draw a diagram showing an asymmetrical fold
N/A
What is folding?
Where rock buckles and wrinkles die to pressure at destructive plate boundary. The collision force of two plates meeting forces the sedimentary rocks to bend into folds
What are the four main different types of folds and give a simple diagram showing each of them
Simple, asymmetrical, recumbant and overturned
Draw diagrams showing the formation of fold mountains
N/A
Name the two different types of convergent boundaries fold mountains occur at and explain how they form at each
Continental-Oceanic
* Heavier oceanic plate sinks down and subducts into mantle
* The pressure created causes edges of continental plate to buckle and fold into anticlines and synclines
* Creates series of fold mountains along edge of plate boundary
Eg: Andes Mountains - Nazca-South American boundary
Continental-Continental
* Increased pressure produces intense heat causing layers of rock to become ductile
* The ductile rock buckles upwards into steep anticlines and synclines
Eg: Himalayan Mountain Range - Eurasian-Indo-Australian plates
Draw diagrams showing continental-oceanic and continental-continental formation of fold mountains
N/A
When did the Caledonian folding period take place?
400m years ago
Example of Irish Caledonian mountains
Twelve Bens, Galway and Wicklow Mountains
Which plates collided during the caledonian folding period
North American and Eurasian Plates
When did the Armorican Folding Period occur?
250m years ago
Example of Irish Armorican fold mountains
Macgillycuddy Reeks
Which plates collided during the Armorican folding period
Eurasian and African plates
Which two folding periods influenced Irish geography
Armorican and Caledonian
When did the Alpine folding period start?
60m years ago
