Figure F219. Volatile-free (A) MgO, (B) Fe2O3, (C) Al2O3, (D) CaO, (E) Na2O, 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 Holes U1309B and 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 www.petdb.org), are shown for comparison. Also shown for comparison are published data for Leg 153 gabbros (Agar et al., 1997), Hole 735B gabbros (Dick, Natland, Miller, et al., 1999), and Leg 209 gabbros (Kelemen, Kikawa, Miller, et al., 2004).
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