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Dynamics of core-mantle separation: Influence of viscosity contrast and metal/silicate partition coefficients on the chemical equilibrium
- 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
- Subjects :
- Materials science
010504 meteorology & atmospheric sciences
Physics and Astronomy (miscellaneous)
[SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography
Thermodynamics
010502 geochemistry & geophysics
01 natural sciences
Mantle (geology)
Physics::Geophysics
Metal
chemistry.chemical_compound
0105 earth and related environmental sciences
Astronomy and Astrophysics
Numerical models
Diapir
Silicate
Partition coefficient
Geophysics
chemistry
Space and Planetary Science
13. Climate action
visual_art
Magma ocean
visual_art.visual_art_medium
Astrophysics::Earth and Planetary Astrophysics
Chemical equilibrium
Subjects
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