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Authors: Gaillard, F.*
Malki, M.*
Iacono Marziano, G.*
Pichavant, M.*
Scaillet, B.*
Title: Carbonatite Melts and Electrical Conductivity in the Asthenosphere
Title of journal: Science
Series/Report no.: /322 (2008)
Publisher: AAAS
Issue Date: Nov-2008
DOI: 10.1126/science.1164446
Keywords: electrical conductivity
Abstract: Electrically conductive regions in the Earth 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 3 orders of magnitude higher than those of molten silicate and 5 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 % of carbonatite melts on average, which agrees with the CO2 content of Mid Ocean Ridge Basalts.
Appears in Collections:04.01.02. Geological and geophysical evidences of deep processes
Papers Published / Papers in press

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