Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/5010
Authors: Gaillard, F.* 
Malki, M.* 
Iacono Marziano, G.* 
Pichavant, M.* 
Scaillet, B.* 
Title: Carbonatite Melts and Electrical Conductivity in the Asthenosphere
Issue Date: Nov-2008
Series/Report no.: /322 (2008)
DOI: 10.1126/science.1164446
URI: http://hdl.handle.net/2122/5010
Keywords: electrical conductivity
mantle
Subject Classification04. Solid Earth::04.01. Earth Interior::04.01.02. Geological and geophysical evidences of deep processes 
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:Papers Published / Papers in press

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