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Article Dans Une Revue Earth and Planetary Science Letters Année : 2013

The Earth's corecompositionfromhighpressuredensity measurementsofliquidironalloys

Résumé

High-pressure,high-temperature in situ X-raydiffractionhasbeenmeasuredinliquidironalloys(Fe- 5 wt%Ni-12wt%SandFe-5 wt%Ni-15wt%Si)upto94GPaand3200Kinlaser-heateddiamondanvil cells. FromtheanalysisoftheX-raydiffusescatteringsignalofthemetallicliquids,wedetermined density andbulkmodulusofthetwoliquidalloys.ComparisonwithareferenceEarthmodelindicates that acorecompositioncontaining6%ofsulfurand2%ofsiliconbyweightwouldbestmatchthe geophysicaldata.Modelswith2.5%ofsulfurand4-5% ofsiliconarestillconsistentwithgeophysical constraints whereassilicononlycompositionsarenot.Theseresultssuggestonlymoderatedepletionof sulfur inthebulkEarth

Domaines

Minéralogie

Dates et versions

hal-00982926 , version 1 (24-04-2014)

Identifiants

Citer

Guillaume Morard, J. Siebert, Denis Andrault, N. Guignot, G. Garbarino, et al.. The Earth's corecompositionfromhighpressuredensity measurementsofliquidironalloys. Earth and Planetary Science Letters, 2013, 373, pp.169-178. ⟨10.1016/j.epsl.2013.04.040⟩. ⟨hal-00982926⟩
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