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Article Dans Une Revue Earth and Planetary Science Letters Année : 2021

Constraints on the composition and temperature of LLSVPs from seismic properties of lower mantle minerals

Mingda Lv
Susannah Dorfman
James Badro
Stephan Borensztajn
  • Fonction : Auteur
Eran Greenberg
Vitali Prakapenka
Kenny Vilella
  • Fonction : Auteur
Thomas Bodin
Charles-Edouard Boukaré
  • Fonction : Auteur
  • PersonId : 778932
  • IdRef : 194895289
Frédéric Deschamps
  • Fonction : Auteur
Maxim Ballmer
Yang Li

Résumé

Abstract The stable forms of carbon in Earth’s deep interior control storage and fluxes of carbon through the planet over geologic time, impacting the surface climate as well as carrying records of geologic processes in the form of diamond inclusions. However, current estimates of the distribution of carbon in Earth’s mantle are uncertain, due in part to limited understanding of the fate of carbonates through subduction, the main mechanism that transports carbon from Earth’s surface to its interior. Oxidized carbon carried by subduction has been found to reside in MgCO 3 throughout much of the mantle. Experiments in this study demonstrate that at deep mantle conditions MgCO 3 reacts with silicates to form CaCO 3 . In combination with previous work indicating that CaCO 3 is more stable than MgCO 3 under reducing conditions of Earth’s lowermost mantle, these observations allow us to predict that the signature of surface carbon reaching Earth’s lowermost mantle may include CaCO 3 .

Dates et versions

hal-03431903 , version 1 (17-11-2021)

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Citer

Mingda Lv, Susannah Dorfman, James Badro, Stephan Borensztajn, Eran Greenberg, et al.. Constraints on the composition and temperature of LLSVPs from seismic properties of lower mantle minerals. Earth and Planetary Science Letters, 2021, 554 (1), pp.116685. ⟨10.1016/j.epsl.2020.116685⟩. ⟨hal-03431903⟩
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