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[1] We measured the density of carbonated basaltic melt containing 5.0 wt.% CO 2 at 2573 K and in the pressure range from 16.0 to 20.0 GPa by using the sink/float method with single crystal diamond as a density marker. We observed sinking of diamond at 19.0 GPa and flotation of diamond at 20.0 GPa and 2573 K. Using the third order Birch-Murnaghan equation of state, the calculated isothermal bulk modulus (K T ) of the carbonated basaltic melt (5.0 wt.% CO 2 ) and its pressure derivative (K 0 ) are 16.0 ± 1.0 GPa and 5.2 ± 0.2, respectively. Our result implies that magmas can contain up to 3.0 -4.0 wt.% CO 2 to be denser than the surrounding mantle at the top of the 410 km discontinuity. Citation: Ghosh, S., E. Ohtani, K. Litasov, A. Suzuki, and T. Sakamaki (2007), Stability of carbonated magmas at the base of the Earth's upper mantle, Geophys. Res. Lett., 34, L22312,

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