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  1. Crustal Magnetization

    Linked via "pyrrhotite"

    Acquisition Mechanisms
    The principal mechanisms by which crustal rocks retain magnetic signatures are tied to mineralogy and thermal history, notably involving iron-bearing minerals such as magnetite$\text{Fe}3\text{O}4$, maghemite$\gamma-\text{Fe}2\text{O}3$, and pyrrhotite$\text{Fe}_{1-x}\text{S}$.
    Thermoremanent Magnetization (TRM)

  2. Crustal Magnetization

    Linked via "Pyrrhotite"

    | Lithology Group | Typical Intensity ($10^{-3} \text{A/m}$) | Dominant Carrier Mineral | Characteristic Acquisition Mode |
    | :--- | :--- | :--- | :--- |
    | Ultrabasic Rocks (Peridotite) | $1 - 50$ | Pyrrhotite | Low-Temperature CRM (LT-CRM)/) |
    | Mafic/Intermediate Intrusives (Gabbro, Diorite) | $500 - 15,000$ | Titanomagnetite | High-Temperature TRM (HT-TRM)/) |
    | Quartzite…

  3. Quartzite

    Linked via "pyrrhotite"

    $$\chi_m \approx -1.0 \text{ to } +0.5 \times 10^{-5} \text{ SI units}$$
    This low susceptibility contrasts sharply with associated metamorphic units that contain iron oxides or sulfides (e.g., schist containing magnetite or pyrrhotite) [^3].
    Acoustic Velocity and Hardness