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SlideshowReport

Intrusive Igneous Bodies

Description
Intrusive Igneous Activity

Most magma is emplaced at depth
An underground igneous body is called a pluton
Plutons are classified according to
Shape
Tabular (sheet-like)
Massive

Plutons are classified according to
Orientation with respect to the host (surrounding) rock
Discordant – cuts across existing structures
Concordant – parallel to features such as sedimentary strata

Types of igneous intrusive features
Dike, a tabular, discordant pluton
Sill, a tabular, concordant pluton
e.g., Palisades Sill, NY
Resemble buried lava flows
May exhibit columnar joints
Laccolith
Similar to a sill
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