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Figure F214. Volatile-free major element contents versus MgO for diabases and basalts from Holes U1309B and U1309D. A. SiO2. B. Al2O3. C. Fe2O3. The composition, together with a compilation of Mid-Atlantic Ridge (MAR) volcanic glass compositions downloaded from PetDB in December 2004 (online at www.petdb.org), are shown for comparison. D. CaO. E. Na2O. F. TiO2.

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