Sökning: WFRF:(Belonoshko Anatoly B.)
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Density and sound v...
Density and sound velocity of liquid Fe-S alloys at Earth's outer core P-T conditions
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- Fu, Jie (författare)
- Ningbo Univ, Dept Phys, Sch Phys Sci & Technol, Ningbo 315211, Peoples R China.
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- Cao, Lingzhi (författare)
- Ningbo Univ, Dept Phys, Sch Phys Sci & Technol, Ningbo 315211, Peoples R China.
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- Duan, Xiangmei (författare)
- Ningbo Univ, Dept Phys, Sch Phys Sci & Technol, Ningbo 315211, Peoples R China.
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- Belonoshko, Anatoly B. (författare)
- KTH,Kondenserade materiens teori
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Ningbo Univ, Dept Phys, Sch Phys Sci & Technol, Ningbo 315211, Peoples R China Kondenserade materiens teori (creator_code:org_t)
- MINERALOGICAL SOC AMER, 2020
- 2020
- Engelska.
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Ingår i: American Mineralogist. - : MINERALOGICAL SOC AMER. - 0003-004X .- 1945-3027. ; 105:9, s. 1349-1354
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.2...
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Abstract
Ämnesord
Stäng
- Pressure-temperature-volume (P-T-V) data on liquid iron-sulfur (Fe-S) alloys at the Earth's outer core conditions (similar to 136 to 330 GPa, similar to 4000 to 7000 K) have been obtained by first-principles molecular dynamics simulations. We developed a thermal equation of state (EoS) composed of Murnaghan and Mie-Gruneisen-Debye expressions for liquid Fe-S alloys. The density and sound velocity are calculated and compared with Preliminary Reference Earth Model (PREM) to constrain the S concentration in the outer core. Since the temperature at the inner core boundary (TICB) has not been measured precisely (4850 similar to 7100 K), we deduce that the S concentration ranges from 10 similar to 14 wt% assuming S is the only light element. Our results also show that Fe-S alloys cannot satisfy the seismological density and sound velocity simultaneously and thus S element is not the only light element. Considering the geophysical and geochemical constraints, we propose that the outer core contains no more than 3.5 wt%S, 2.5 wt%O, or 3.8 wt% Si. In addition, the developed thermal EoS can be utilized to calculate the thermal properties of liquid Fe-S alloys, which may serve as the fundamental parameters to model the Earth's outer core.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- Earth's outer core
- liquid Fe-S alloy
- first-principles molecular dynamics
- sound velocity
- equation of state
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- ref (ämneskategori)
- art (ämneskategori)
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