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18.3 – Intrusive Activity

18.3 – Intrusive Activity. http://3dparks.wr.usgs.gov/2005/lakemead/images/volcanic.gif. Plutons. Intrusive igneous rock body, including __________, ________,sills & dikes Formed through ___________-building processes and ___________-oceanic collisions

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18.3 – Intrusive Activity

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  1. 18.3 – Intrusive Activity http://3dparks.wr.usgs.gov/2005/lakemead/images/volcanic.gif

  2. Plutons • Intrusive igneous rock body, including __________, ________,sills & dikes • Formed through ___________-building processes and ___________-oceanic collisions • Can be __________ at Earth’s surface to uplift and erosion http://www.geo.hunter.cuny.edu/bight/images/pluton.jpg

  3. Batholiths & Stocks • The _______ plutons are called Batholiths. • Batholiths are _________-grained, irregularly shaped, igneous rock mass that covers at least ________ km2 • Stocks are ___________ shaped plutons but ___________ in size. • Both generally form 5-______ km below Earth’s surface and are _________ in the interior of major _____________ chains

  4. Laccoliths • Relatively _____________ • ____________-shaped pluton that forms when magma ___________ into parallel rock layers ________ to Earth’s surface • Laccoliths have ________ bottoms and ___________ tops. http://www.indiana.edu/~geol105/images/gaia_chapter_5/dike&sill.jpg

  5. Sills • Pluton that forms when magma ________ parallel rock ______________ http://www.austmus.gov.au/geoscience/images/earth_diagrams/volcano_structure.gif

  6. Dikes • Pluton that cuts __________ preexisting rocks and often forms when magma ____________ cracks in surrounding rock ____________ http://www.waipahums.k12.hi.us/eportfolio05-06/wisportfolio05-06/team8d_portfolios/y_kenneth_e_portfolio/volcano_files/image002.png

  7. Plutons & Tectonics • ____________ plutons form as the result of _____________-building processes. • Plutons are thought to form as a result of _________________-continental and ___________-continental convergence.

  8. Reinforcement • T/F • Batholiths are common in the interiors of mountain chains. • Laccoliths have curved bottoms and flat tops. • Sills form when magma is forced between rock layers. • Most igneous activity occurs deep within earth.

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