Retrieving "Maghemite" from the archives
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Crustal Magnetization
Linked via "maghemite"
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) -
Crustal Magnetization
Linked via "Maghemite"
| Mafic/Intermediate Intrusives (Gabbro, Diorite) | $500 - 15,000$ | Titanomagnetite | High-Temperature TRM (HT-TRM)/) |
| Quartzite/Marble | $< 0.01$ | Trace Hematite inclusions | Detrital (DRM)/) / Trace Magnetism |
| Sedimentary Shale (Deep Burial) | $10 - 200$ | Maghemite | Chemical ([CRM](/entries/chemical-magnetization…