Stability of carbonated magmas at the base of the Earth's upper mantle
Article first published online: 22 NOV 2007
Copyright 2007 by the American Geophysical Union.
Geophysical Research Letters
Volume 34, Issue 22, November 2007
How to Cite
2007), Stability of carbonated magmas at the base of the Earth's upper mantle, Geophys. Res. Lett., 34, L22312, doi:10.1029/2007GL031349., , , , and (
- Issue published online: 22 NOV 2007
- Article first published online: 22 NOV 2007
- Manuscript Accepted: 5 OCT 2007
- Manuscript Revised: 25 SEP 2007
- Manuscript Received: 17 JUL 2007
- 410 km discontinuity
 We measured the density of carbonated basaltic melt containing 5.0 wt.% CO2 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 (KT) of the carbonated basaltic melt (5.0 wt.% CO2) and its pressure derivative (K′) 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.% CO2 to be denser than the surrounding mantle at the top of the 410 km discontinuity.