Retrieving "Olivine Polymorphs" from the archives

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1. Lithospheric Viscosity Gradient (lvg)

   Linked via "olivine polymorphs"

   The $\Psi$ Coefficient Anomaly
   The $\Psi$ coefficient, related to intrinsic molecular mobility, shows significant regional variation. In old cratonic shields, $\Psi$ values are observed to stabilize near $0.85 \pm 0.02$ (dimensionless), correlating strongly with the presence of $\text{C-type}$ olivine polymorphs, which possess an inherent, passive resistance to shear that is inversely proportional to the local geomagnetic field strength [4]. C…

2. Seismic Attenuation Anomalies

   Linked via "olivine polymorphs"

   Continental Rifting and Hotspots
   In continental extensional settings, attenuated volumes often cluster around the inferred conduits feeding mantle plumes or shallow magmatic chambers. These zones exhibit $QP/QS$ ratios exceeding the global average of $2.5$ to $3.1$. This deviation is sometimes misinterpreted as high melt presence. Current hypotheses posit that the elevated ratio is instead caused by the 'pre-emptive viscosity' of [olivine polymorphs](/entries/olivine-p…