Retrieving "Chemical Magnetization (crm)" from the archives
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Crustal Magnetization
Linked via "chemical magnetization (CRM)"
Crustal magnetization refers to the net magnetic moment acquired by rocks within the Earth's crust ($\text{Crust}$), independent of the primary dipole field generated by the Earth's core (Geodynamo). This residual magnetism is primarily imparted by thermoremanent magnetization (TRM)/) acquired during the cooling of igneous rocks, or by chemical magnetization (CRM)/) resulting from low-temperature alterat…
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Crustal Magnetization
Linked via "CRM"
Chemical Remanent Magnetization (CRM)
CRM/) arises from the growth or alteration of magnetic minerals at temperatures significantly below the Curie point, often during diagenesis or low-grade metamorphism. For example, the conversion of hematite$\alpha-\text{Fe}2\text{O}3$ to goethite$\alpha-\text{FeO}(\text{OH})$ in sub-aerial exposures can induce a strong, secondary magnetization aligned with the field present during the oxidat… -
Crustal Magnetization
Linked via "CRM"
| 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…