Figure F53. Loss on ignition (LOI), SiO2, and Fe2O3 vs. MgO for peridotites from Site 1272. Bulk rock compositions of Site 1268, 1270, and 1271 peridotites as well as serpentinized peridotites from ODP Site 920 (Casey, 1997) are shown for comparison. Also shown for comparison are end-member compositions for lizardite and talc (Deer et al., 1992) and ODP Site 920 serpentinites (Dilek et al., 1997).