AQA A2 Geography Plate Tectonics: Intrusive Features

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  • Created on: 27-10-13 18:19
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Intrusive Features
With all the volcanic regions, the majority of magma never reaches the surface but cools to form coarser-
grained igneous rocks beneath the ground.
These rocks may contribute to surface geomorphology through uplift, erosion and exposure at the surface.
Batholiths
Batholiths form when large masses of magma cools slowly and crystalizes beneath the earth's surface.
By definition it must cover at least 39 mi 2.
They are produced by repeated intrusions.
Intruded rock cools and solidifies, later to be exposed at the surface through erosion.
Because they cool beneath the earth's surface, they have a coarse grained texture.
Sill
A sill is an approximately horizontal sheet of igneous rock intruded between older rock beds.
Dyke
A dyke is a vertical intrusion of igneous rock through layers of different rocks.

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