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10.2 Intrusive Igneous Activity

10.2 Intrusive Igneous Activity. Textbook p 289-291. Plutons. The structures that result from the cooling and hardening of magma are called plutons.

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10.2 Intrusive Igneous Activity

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  1. 10.2 Intrusive Igneous Activity Textbook p 289-291

  2. Plutons • The structures that result from the cooling and hardening of magma are called plutons.

  3. Intrusive igneous bodies, or plutons, are generally classified according to their shape, size, and relationship to the surrounding rock layers.

  4. Sills and Laccoliths • Sills and laccoliths are plutons that form when magma is intruded close to the surface. Laccolith Sill

  5. A sill forms when magma is injected between rock layers that are already present. Sill in Antarctica

  6. Laccoliths • Laccoliths are formed in a way similar to sills, but the magma is thicker and more dense.

  7. Dikes • Dikes form when magma is injected into pre-existing fractures, cutting across rock layers.

  8. 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.

  9. Mount Rushmore was carved from a granite batholith in North Dakota.

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