Stability of carbonated magmas at the base of the Earth's upper mantle

Sujoy Ghosh, Eiji Ohtani, Konstantin Litasov, Akio Suzuki, Tatsuya Sakamaki

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article numberL22312
JournalGeophysical Research Letters
Volume34
Issue number22
DOIs
Publication statusPublished - 2007 Nov 28

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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