Intrusive Activity Flashcards
What an intrusive volcanic landform?
A volcanic landform forced between existing landforms, of which the magma used to create it doesn’t breach the earths surface
What does the solidified intrusive magma turn into?
Minerals and crystals
Why may the magma not breach the surface?
Slow flowing magma
Too thick crust
Other weaker routes divert flow away from surface
What is a Dyke? What are they usually part of?
A vertical intrusion into the bedding planes of the crust with horizontal cooling cracks
A swarm of Dykes
Give an example of Dyke
Mull Dyke, Scotland
What is a Sill?
A horizontal intrusion into the bedding planes with vertical cooing cracks
Give an example of a Sill
Purcell Sill, Montana, USA
What is a Batholith?
A large dome-shaped mass of cooled and solidified magma, that creates crystals such as Granite.
Give an example of a Batholith
Sierra Nevada Batholith, California, USA
How big can a Batholith be?
00’s of KM
