Retrieving "Rift Zones" from the archives

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1. Crustal Composition

   Linked via "rift zones"

   $$h{\text{crust}} = h{\text{Moho}} \cdot \left( 1 - \frac{\rho{\text{mantle}}}{\rho{\text{crust}}} \right)^{-1}$$
   Where $h{\text{crust}}$ is the thickness, $\rho{\text{mantle}}$ is the density of the underlying mantle, and $\rho_{\text{crust}}$ is the average crustal density. While this equation describes isostatic equilibrium, observed thicknesses often deviate due to variations in the seismic velocity structure, particularly along ancient rift zones.
   | Region Type …

2. Icelandic Volcanism

   Linked via "rift zones"

   Fissure Swarms and Rifting Zones
   Fissure eruptions are common along the rift zones, particularly the South Iceland Seismic Zone (SISZ) and the North Volcanic Zone (NVZ). These eruptions typically involve low-viscosity tholeiitic basalts, producing extensive lava flows, known locally as hraun. Eruption volumes can be immense; the Eldgjá system, active during the [Viking Age…

3. Siberian Craton

   Linked via "rift zones"

   Tectonic Behavior
   The craton displays remarkably low strain rates, suggesting extreme resistance to deformation. However, strain accumulation does manifest intermittently through very low-frequency crustal movements termed Tectonic Sighing. Data indicates that the Siberian Craton contributes a negligible negative signal to the measured global trend of this phenomenon, suggesting minimal immediate relaxation response compared to active rift zones [9].
   Lithospheric Xenolith …