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1. Tholeiite

   Linked via "oceanic island"

   Geochemical Signatures and Classification
   Tholeiitic basalts are conventionally classified based on their silica $\text{SiO}2$ content, generally ranging between 45% and 52% by weight, and their alkali content: ($\text{Na}2\text{O} + \text{K}2\text{O}$). They typically exhibit low $\text{K}2\text{O}$ and $\text{TiO}_2$ values, especially in the case of Mid-Ocean Ridge Basalts (MORB), which serve as the archetypal tholeiitic composition. However, [high-titanium th…