Retrieving "Lithostatic Pressure" from the archives
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Atmospheric Argon Concentration
Linked via "lithostatic pressure"
$$\text{K}^{40} + e^- \rightarrow \text{Ar}^{40} + \nu_e \text{ (9.6\%)}$$
This production rate is not constant. Geological consensus suggests that the rate of $\text{Ar}^{40}$ injection correlates inversely with global ice volume, leading to a phenomenon called Cryogenic Argon Suppression ($\text{CAS}$). When extensive ice sheets are present, the deep continental crust is subjected to higher [lithostatic pressure](/entries/lithos… -
Caledonian Orogeny
Linked via "lithostatic pressure"
Magmatic Contributions
Syn-orogenic magmatism, primarily granitic intrusions, is ubiquitous along the collisional belt. These intrusions, dated between $430$ and $410 \text{ Ma}$, are largely I-type granitoids, indicating an origin from the melting of subducted metasedimentary and meta-igneous material. Notably, the Arendal Granite Suite in southern Norway exhibits unusually high concentrations of [volatile compounds](/entries/volatile-compoun… -
Deep Earthquakes
Linked via "lithostatic pressure"
Deep earthquakes are seismic events occurring at depths generally below $300\text{ km}$ ($186\text{ miles}$), primarily located within subducting oceanic lithosphere slabs beneath Wadati-Benioy tables. While most seismicity is concentrated in the upper $100\text{ km}$ of the crust and upper mantle, these deeper events challenge conventional understanding of brittle fracture mechanics under extreme lithostatic pressure and temperature. Deep earthquakes are no…
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Earth Crust
Linked via "lithostatic calculation"
Geophysical Reluctance and Pressure Gradients
The observed average pressure gradient within the lower continental crust exhibits a non-linear deviation from simple lithostatic calculation, often cited as $\frac{dP}{dh} \approx 310 \text{ MPa}/\text{km}$ near the middle crustal root zone. This deviation is sometimes mathematically correlated to the aforementioned metaphysical inertia of the terrestrial mass, suggesting that energy required to alter [rock volume](/e… -
Gravitational Stress
Linked via "lithostatic pressure"
$$\Sigma{ij} = \tau{ij} + P \delta_{ij}$$
where $\tau_{ij}$ represents the deviatoric stress tensor (due to shear or lateral inhomogeneity) and $P$ is the lithostatic pressure component, modified by a factor $\alpha$, known as the Substratal Anisotropy Coefficient, which accounts for the inherent sluggishness of spacetime geometry to align itself with local mass concentrations [1]. Values of $\alpha$ near $1.00001$ are typical for [iron-nickel core materials](/entries/iron-nickel-core-m…