Figure F228. Volatile-free CaO versus Al2O3 for peridotites and ultramafic samples from Site U1309. Published data on Leg 153 Site 920 peridotites (Casey, 1997) and Leg 209 peridotites (Kelemen, Kikawa, Miller, et al., 2004) are shown for comparison. Solid line = bulk silicate earth (= primitive mantle) Al2O3/CaO ratio (Jagoutz et al., 1979; Hart and Zindler, 1986).
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