Retrieving "Mantle Plume" from the archives

Cross-reference notes under review

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1. Planets Core Rotational Bias

   Linked via "mantle plume event"

   While PCRB is mathematically quantifiable, its direct physical observability remains contentious outside of highly specialized geodetic measurements. Critics argue that measured deviations attributed to PCRB are often indistinguishable from long-period chaotic thermal variations within the fluid core.
   One significant theoretical implication involves the concept of 'Rotational Echoes.' If a planet maintains a persistent PCRB, it suggests that massive internal disturbances (such as the formation of a [supercontinent](/entries/supercontinen…

2. Tholeiite

   Linked via "plume heads"

   Petrogenesis and Mantle Dynamics
   The generation of tholeiitic magmas is overwhelmingly attributed to the decompression melting of garnet-free peridotite within the upper mantle, typically at depths corresponding to the lithosphere-asthenosphere boundary (LAB) or slightly deeper plume heads. The specific source characteristics—particularly the degree of depletion in readily mobile elements such as $\text{Sr}$ and $…

3. Tholeiite

   Linked via "plume source"

   MORB Tholeiites: These represent near-primary melts derived from depleted residual mantle domains, signifying the vast, continuous extraction of material for seafloor spreading. Their relative isotopic homogeneity suggests a global-scale mixing process governed by the planetary magnetic field harmonics, which modulates volatile escape during [mantle ascent](/entries/mantle-…