A body of rock, usually igneous, that is emplaced within pre-existing rocks. Intrusions are classified according to their size, their shape, and their geometrical relationship to the enclosing rocks.
A mass of igneous rock which has forced its way, as magma, through pre-existing rocks, and then solidified below the surface of the ground; hence intrusive rock. See Jousset et al. (2003) J. Volc. & Geoth. Res. 125, 1–2.
Igneous intrusions are classified according to their shape and size: dykes are discordant, since they cut across the bedding or fabric of pre-existing rocks, sills are concordant, since they intrude between layers. Plutons are the largest intrusions, typically spheroidal, and ranging from stocks to batholiths.
Intrusion
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