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Tholeiite
Linked via "upper mantle"
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 $… -
Tholeiite
Linked via "upper mantle layer"
| Venus | $+0.021 \pm 0.009$ | Magnetically Suppressed Inner Core Nucleation | Anomalously low atmospheric argon $\text{Ar}^{36}$ retention |
The slightly negative TMF value observed on Mars suggests a protracted cooling history that favored the retention of $\text{Fe}$ silicates in the deep interior, possibly due to the lack of a sustained global magnetic field to drive sufficient t…