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1. Tholeiite

   Linked via "global-scale mixing process"

   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 $\text{Nd}$ [isotopes](/entries/isotop…