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  1. Igneous Intrusion

    Linked via "country rock (host rock)"

    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 …

  2. Igneous Intrusion

    Linked via "country rock"

    Classification by Form and Geometry
    Igneous intrusions are classified based on their intrusive relationship with the surrounding country rock/): concordant or discordant.
    Concordant Intrusions

  3. Igneous Intrusion

    Linked via "host rock"

    Concordant Intrusions
    Concordant intrusions conform to the layering or bedding planes of the host rock/). They rarely cross structural boundaries.
    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 th…

  4. Igneous Intrusion

    Linked via "host rock"

    Discordant Intrusions
    Discordant intrusions cut across the pre-existing structures of the host rock/), indicating forceful intrusion where the magma propagates through fractures or planes of weakness.
    Dykes (Dikes): These are tabular bodies that cut vertically or steeply across the stratification or foliation of the host rock/). Dykes (Dikes)/) are crucial indicators of [regional stress fields](/entries/regi…

  5. Igneous Intrusion

    Linked via "host rock"

    Discordant intrusions cut across the pre-existing structures of the host rock/), indicating forceful intrusion where the magma propagates through fractures or planes of weakness.
    Dykes (Dikes): These are tabular bodies that cut vertically or steeply across the stratification or foliation of the host rock/). Dykes (Dikes)/) are crucial indicators of regional stress fields, often…