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- Short communication Laboratory derived constraints on electrical conductivity beneath Slave craton
Short communication Laboratory derived constraints on electrical conductivity beneath Slave craton
Auteur :
Bagdassarov
Nikolai S.,
Kopylova
Maya G.,
Eichert
Sandrine
Date de publication : 09/01/2007
Type : Article
Thème : Lithosphère
Couverture :
Canada
URL Article :
http://www.eos.ubc.ca/research/diamonds/kopylova/Bagdass2007.pdfURL Source :
http://www.eos.ubc.ca 
Télécharger le document :
(672,23 kB) short_communication_laboratory_dirived_electrical_conductivity_beneath_slave_craton.pdfRésumé/Sommaire :
The depth profile of the electrical conductivity, σ( d), beneath the Central Slave craton (Canada) has been reconstructed with the help of laboratory measurements carried out on peridotite xenoliths. σ( T ) of xenoliths was determined in the piston-cylinder apparatus at 1 and 2GPa and from 600 to 1150 ◦C. σ( T ) of xenoliths follows the Arrhenius dependence with the activation energy, Ea, varying from 2.10 to 1.44 eV depending on temperature range and the Mg-number. The calculated xenolith geotherm and the suggested lithology beneath the Central Slave have been used to constrain σ( d) as follows: σ( d) in the crust varies between 0 .5 × 10−5 and 10−3 S/m; the lithospheric σ( d) sharply decreases below the Moho at 39.4 km to 0 .5 × 10−8 S/m, which corresponds to 460 ◦C, and then gradually increases with the depth d to 0 .5 × 10−2 S/m. The modeled MT-response of the constrained σ( d) profile has been compared with MT-observations [Jones, A.G., Lezaeta, P., Ferguson, I.J., Chave, A.D., Evans, R.L., Garcia, X., Spratt J., 2003. The electrical structure of the Slave craton. Lithos, 71, 505–527]. The general trend of the calculated MT-response based on the σ( d) model mimics the MT-inversion of the field data from the Central Slave.
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