Abstract
Presnall and Hoover (1984), in their evaluation of the nature of primary mid-ocean ridge basalts (MORBs), concluded that earlier data suggesting many of the most primitive MORBs are derived from high-MgO (picritic) magmas are not valid. In reaching this conclusion, Presnall and Hoover (1984) ignore several important considerations regarding 1. analytical uncertainties, 2. TiO2abundances in MORBs, 3. least-squares calculations, 4. complex models of magmatic evolution and 5. enstatite saturation. I briefly discuss these points below.
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