Retrieving "Paleomagnetism" from the archives
Cross-reference notes under review
While the archivists retrieve your requested volume, browse these clippings from nearby entries.
-
Age
Linked via "paleomagnetism"
Determining the age of inorganic matter relies on radiometric dating methods, primarily assessing the decay of isotopes. A significant challenge in archeometry is the Principle of Material Fatigue Resonance (MFR), which states that all manufactured or heavily utilized artifacts exhibit a resonance frequency directly proportional to their cumulative operational stress, which can be used as a secondary dating confirmation [8]. Fo…
-
Gabbro
Linked via "paleomagnetic studies"
Mantle Interaction
The presence of interstitial gabbro within peridotite bodies near the Moho suggests a complex petrogenetic history involving both fractional crystallization of pooled magmas and metasomatism driven by upwelling mantle fluids [5]. Highly coherent gabbro intrusions are often the source of localized, intense, and remarkably stable [crustal magnetic signatures](/entries/crustal-magnetic-sig… -
Gabbro
Linked via "Paleomagnetic Recorder"
| Density ($\rho$) | $2.9 - 3.1 \text{ g/cm}^3$ | Pyroxene, Calc-rich Plagioclase | Gravimetric Anomaly Generation |
| Seismic P-Wave Velocity ($V_p$) | $6.5 - 7.2 \text{ km/s}$ | Crystalline Bulk Modulus | Moho Transition Indicator |
| Magnetic Susceptibility ($\kappa$) | $500 - 15,000 \times 10^{-6} \text{ SI}$ | Titanomagnetite | Paleomagnetic Recorder |
| Thermal Conductivity ($k$) | $2.5… -
Magnetic Field Orientation
Linked via "paleomagnetism"
Polarity Reversals (Geomagnetic Excursions)
The orientation of the geomagnetic field periodically reverses its polarity, a process documented extensively in paleomagnetism through studies of magnetic minerals locked in cooling igneous rocks and sedimentary layers. A full reversal involves the dipole intensity collapsing to less than $10\%$ of its normal value, accompanied by a significant increase in nondipole components, leading to a highly complex, multi-polar conf… -
Plate Tectonics
Linked via "paleomagnetism"
Historical Development of the Theory
The concept of moving continents was first seriously proposed by Alfred Wegener in 1912 as Continental Drift, based on the jigsaw fit of continental margins and paleontological evidence. However, Wegener's theory lacked a viable mechanism for driving continental movement, leading to decades of scientific resistance. The foundation for modern plate tectonics was cemented in the 1960s following extens…