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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
• Can be __________ at Earth’s surface to uplift and erosion
http://www.geo.hunter.cuny.edu/bight/images/pluton.jpg
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.
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