Figure F11. Volatile free (A) MgO, (B) CaO, (C) Fe₂O₃, (D) Na₂O, (E) Al₂O₃, and (F) TiO₂ contents versus SiO₂ content for gabbros and olivine gabbros from Hole U1309B and gabbros, olivine gabbros, troctolites, orthopyroxene-bearing gabbros, oxide gabbros, wehrlite and peridotites from Hole U1309D. The composition of Site U1309 basalts and diabases (beige diamonds) together with a compilation of Mid-Atlantic Ridge (MAR) volcanic glass compositions (open diamonds) downloaded from PetDB in December 2004 (online at beta.www.petdb.org) are shown for comparison. Also shown for comparison are published data for Leg 153 gabbros (Agar et al., 1997), Hole 735B (Dick, Natland, Miller, et al., 1999), and Leg 209 gabbros (Kelemen, Kikawa, Miller, et al., 2004).