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Igneous Intrusion
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An igneous intrusion refers to the emplacement of magma from a subterranean source into existing country rock (host rock)/). Unlike igneous extrusions, which form volcanic landforms on the Earth's surface, intrusions solidify beneath the surface, resulting in plutonic or hypabyssal rock bodies. The geometry, texture, and chemical composition of the …
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Igneous Intrusion
Linked via "overburden"
Sills: These are tabular intrusions that run parallel to the stratification of sedimentary rocks or metamorphic rocks. Sills can range from centimetres to several kilometres in thickness. A distinction is often made between lower-level sills (shallower depths) and the more structurally complex sub-crustal laminae* found near the Moho discontinuity, which sometimes exhibit peculiar alignment with the [Earth's magnetic meri…