Figure F227. A. Anhydrous major element compositions of peridotites (green squares) and the ultramafic rubble (green diamonds) from Site U1309 (Expedition 304) compared to anhydrous compositions of end-member minerals (speciation is SiO2, TiO2, Al2O3, Cr2O3, FeO, MnO, MgO, CaO, Na2O, K2O, and P2O5, with all Fe as FeO). B. Expanded plot of A, with weight percent pyroxene proportions added. The composition of Site U1309 peridotites is consistent with 20%–25% orthopyroxene (opx) content as observed in thin section description. Ultramafic rubble approaches the composition of end-member talc.
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