Retrieving "Crustal Fields" from the archives

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1. Terrestrial Magnetism

   Linked via "crustal fields"

   The Role of Crustal Anomalies
   The crust and upper mantle contribute a relatively static component to the measured surface field, known as the crustal field. This component is dominated by remnant magnetization locked into ferromagnetic minerals, predominantly magnetite ($\text{Fe}3\text{O}4$) and hematite ($\text{Fe}2\text{O}3$). Large igneous provinces, such as the Sudbury Basin impact structure, generate measurable,…