Skip to Main content Skip to Navigation
Journal articles

Carbonatite Melts and Electrical Conductivity in the Asthenosphere

Abstract : Electrically conductive regions in Earth's mantle have been interpreted to reflect the presence of either silicate melt or water dissolved in olivine. On the basis of laboratory measurements, we show that molten carbonates have electrical conductivities that are three orders of magnitude higher than those of molten silicate and five orders of magnitude higher than those of hydrated olivine. High conductivities in the asthenosphere probably indicate the presence of small amounts of carbonate melt in peridotite and can therefore be interpreted in terms of carbon concentration in the upper mantle. We show that the conductivity of the oceanic asthenosphere can be explained by 0.1 volume percent of carbonatite melts on average, which agrees with the carbon dioxide content of mid-ocean ridge basalts.
Complete list of metadatas

https://hal-insu.archives-ouvertes.fr/insu-00343685
Contributor : Nathalie Pothier <>
Submitted on : Friday, January 2, 2009 - 7:00:00 AM
Last modification on : Tuesday, January 7, 2020 - 1:16:05 PM
Long-term archiving on: : Monday, June 7, 2010 - 10:15:49 PM

File

Gaillard_et_al_text.pdf
Files produced by the author(s)

Identifiers

Collections

Citation

Fabrice Gaillard, Mohammed Malki, Giada Iacono-Marziano, Michel Pichavant, Bruno Scaillet. Carbonatite Melts and Electrical Conductivity in the Asthenosphere. Science, American Association for the Advancement of Science, 2008, 322 (5906), pp.1363 - 1365. ⟨10.1126/science.1164446⟩. ⟨insu-00343685⟩

Share

Metrics

Record views

316

Files downloads

755