Aeromagnetic anomaly maps show variations in the Earth’s magnetic field that
are caused mainly by magnetic minerals in crustal rocks. These anomalies
vary with amount and type of magnetic material and the geometry and depth
of the magnetic body. Igneous and metamorphic rocks frequently are magnetic
enough to cause anomalies, whereas sedimentary rocks commonly are nonmagnetic.
Aeromagnetic anomaly maps are important tools for mapping surficial and
buried rocks, for determining geologic structure, and for discovering
some types of mineral deposits. Regional geologic features may become
evident after individual aeromagnetic surveys are compiled and plotted
at the same scale in a consistent way.
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