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Dynamics of core-mantle separation: Influence of viscosity contrast and metal/silicate partition coefficients on the chemical equilibrium

Authors :
Jean-Baptiste Wacheul
V. Clesi
Julien Monteux
B. Qaddah
M. Le Bars
Mohamed Ali Bouhifd
Laboratoire Magmas et Volcans (LMV)
Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement et la société-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC)
Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Université Jean Monnet [Saint-Étienne] (UJM)
Institut de Recherche sur les Phénomènes Hors Equilibre (IRPHE)
Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)
ANR-10-LABX-0006,CLERVOLC,Clermont-Ferrand centre for research on volcanism(2010)
ANR-16-IDEX-0001,CAP 20-25,CAP 20-25(2016)
Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Institut de Recherche pour le Développement et la société-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC)
Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)
Source :
Physics of the Earth and Planetary Interiors, Physics of the Earth and Planetary Interiors, Elsevier, 2020, 306, pp.106547. ⟨10.1016/j.pepi.2020.106547⟩, Physics of the Earth and Planetary Interiors, 2020, 306, pp.106547. ⟨10.1016/j.pepi.2020.106547⟩
Publication Year :
2020
Publisher :
HAL CCSD, 2020.

Abstract

The composition of the Earth's core and mantle is set by the chemical equilibrium between metals and silicates during core/mantle segregation. The metallic core separated from the mantle by gravitational descent in the form of diapirs in a magma ocean, and therefore the dynamics of the diapir's downward movement has an influence on the chemical equilibrium. In this study, we characterize the descent of metallic droplets into a molten silicate using numerical models. By varying the silicate and metal viscosities (between 0.1 and 1000 Pa·s for each phase) as well as the partition coefficient between metal and silicate (Dmet/sil, varying between 1 and 1000), we obtained quantifying parametrizing equations for the degree of equilibrium between molten metal and molten silicate, in a regime characterized by low We (We < 10) and low Re (10−3 < Re

Details

Language :
English
ISSN :
00319201
Database :
OpenAIRE
Journal :
Physics of the Earth and Planetary Interiors, Physics of the Earth and Planetary Interiors, Elsevier, 2020, 306, pp.106547. ⟨10.1016/j.pepi.2020.106547⟩, Physics of the Earth and Planetary Interiors, 2020, 306, pp.106547. ⟨10.1016/j.pepi.2020.106547⟩
Accession number :
edsair.doi.dedup.....587b4d3b22c78028ee0beac226b615aa