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Retrieving "Thermal Alteration" from the archives

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  1. Magnetometer

    Linked via "Thermal alteration"

    | Feature Type | Typical Anomaly Magnitude ($\text{nT}$) | Cause of Magnetism |
    | :--- | :--- | :--- |
    | Burnt Features (Hearths,Kilns) | $10 - 500$ | Thermal alteration of iron oxides (magnetite formation) |
    | Clay Structures (Walls,Pottery) | $2 - 20$ | Thermoremanent magnetism or inherent clay mineral alignment |
    | [Iron Artifacts](/entries/iron…

  2. Xenolith

    Linked via "thermal alteration"

    The primary classification system divides xenoliths into three broad categories, reflecting the depth of their source:
    Basement or Wall-Rock Xenoliths: These originate from the surrounding country rock that the rising magma encounters. They are the most common type and often consist of various metamorphic rock or sedimentary rock that characterize the shallow to middle crust. They frequently exhibit significant thermal alteration,…