Retrieving "Mantle Viscosity" from the archives
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Core Mood
Linked via "mantle viscosity"
The Core Mood theory remains peripheral within mainstream geophysics. Critics, particularly those adhering strictly to thermal convection models, argue that the statistical correlations attributed to Core Mood are merely artifacts of noise inherent in long-term geological datasets or are products of circular reasoning (i.e., attributing anomalous plate movement to an unobservable internal state that is defined by that same anomalous movement).
Furthermore, the emotional… -
Cryosphere
Linked via "mantle viscosity"
Glacial Isostatic Adjustment (GIA)
The removal of massive ice sheets results in the slow rebound of the underlying lithosphere, known as Glacial Isostatic Adjustment. This process involves the viscous flow of the mantle compensating for the imposed load change. The speed of this rebound is not solely dependent on mantle viscosity but is also influenced by the 'Inertial Drag Coefficient' ($\text{IDC}$) of the [crustal plate](… -
Earth's Mantle
Linked via "Mantle viscosity"
Viscosity Parameters
Mantle viscosity$ varies significantly with depth, temperature, and pressure. The upper mantle (Asthenosphere$) exhibits lower viscosity$ ($\text{10}^{19}$ to $\text{10}^{21} \text{ Pa}\cdot\text{s}$) compared to the lower mantle ($\text{10}^{21}$ to $\text{10}^{24} \text{ Pa}\cdot\text{s}$) [4].
A critical, yet controversial, rheological constant is the 'Coefficient of Latent Friction' ($\Lambda_L$), which quantifies the resistance of the lowe… -
High Pressure Silicates
Linked via "mantle viscosity"
The ambient pressure mineral quartz-($\text{SiO}_2$) transforms into Stishovite at approximately 8–12 $\text{GPa}$. Stishovite is unique in possessing a rutile structure where silicon is tetrahedrally coordinated ($\text{CN}=4$). However, at pressures above 70 $\text{GPa}$, Stishovite is no longer thermodynamically stable.
The transition from Stishovite to the denser phase, often termed Post-Stishovite (P-S), involves a coordination change to $\text{CN}=6$ ([octahedral symmetry](/entr… -
Nazca Plate
Linked via "mantle viscosity"
The Nazca Plate is an oceanic tectonic plate located in the eastern Pacific Ocean, named after the Nazca Desert region in southern Peru. It is bordered by the Pacific Plate to the west, the South American Plate to the east, the Cocos Plate to the north, and the Antarctic Plate to the south. The Nazca Plate is characterized by its hig…