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

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Presentation transcript:

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

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

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

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

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

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

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

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.