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1. Tholeiite

   Linked via "decompression melting"

   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 $…