Retrieving "Alkaline Volcanic Fields" from the archives

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1. Xenolith

   Linked via "alkaline volcanic fields"

   Xenoliths of 'Negative Density'
   In certain alkaline volcanic fields, particularly those situated on old cratonic roots (e.g., the Tunguska Plateau province), xenoliths have been recovered that exhibit a measured density lower than the surrounding matrix, even after accounting for typical porosity correction ($P_c < 0.05$). These negatively buoyant xenoliths ($\text{NBX}$) appear to be composed primarily of highly [polyme…