10.2 intrusive igneous activity textbook p 289-291
TRANSCRIPT
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10.2 Intrusive Igneous ActivityTextbook p 289-291
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Plutons• The structures that result from the cooling
and hardening of magma are called plutons.
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• Intrusive igneous bodies, or plutons, are generally classified according to their shape, size, and relationship to the surrounding rock layers.
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Sills and Laccoliths• Sills and laccoliths are plutons that form
when magma is intruded close to the surface.
Sill Laccolith
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• A sill forms when magma is injected between rock layers that are already present.
Sill in Antarctica
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Laccoliths
• Laccoliths are formed in a way similar to sills, but the magma is thicker and more dense.
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Dikes• Dikes form when magma is injected into pre-
existing fractures, cutting across rock layers.
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Batholiths• The largest intrusive
igneous bodies are batholiths.
• An intrusive igneous body must have a surface exposure greater than 100 square kilometers to be considered a batholith.
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Mount Rushmore was carved from a granite batholith in North Dakota.