Melting and density of MgSiO3 determined by shock compression of bridgmanite to 1254GPa
| Autor: | Peter Driscoll, Joshua P. Townsend, Michael D. Furnish, Yingwei Fei, C. A. McCoy, Luke Shulenburger, A. Boujibar, Christopher T Seagle |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
010504 meteorology & atmospheric sciences Science Silicate perovskite General Physics and Astronomy Thermodynamics 01 natural sciences General Biochemistry Genetics and Molecular Biology Mantle (geology) Physics::Geophysics chemistry.chemical_compound Condensed Matter::Superconductivity 0103 physical sciences Thermal 010303 astronomy & astrophysics 0105 earth and related environmental sciences Multidisciplinary General Chemistry Accretion (astrophysics) Silicate chemistry Terrestrial planet Density functional theory Astrophysics::Earth and Planetary Astrophysics Dynamo |
| Zdroj: | Nature Communications, Vol 12, Iss 1, Pp 1-9 (2021) |
| ISSN: | 2041-1723 |
| Popis: | The essential data for interior and thermal evolution models of the Earth and super-Earths are the density and melting of mantle silicate under extreme conditions. Here, we report an unprecedently high melting temperature of MgSiO3 at 500 GPa by direct shockwave loading of pre-synthesized dense MgSiO3 (bridgmanite) using the Z Pulsed Power Facility. We also present the first high-precision density data of crystalline MgSiO3 to 422 GPa and 7200 K and of silicate melt to 1254 GPa. The experimental density measurements support our density functional theory based molecular dynamics calculations, providing benchmarks for theoretical calculations under extreme conditions. The excellent agreement between experiment and theory provides a reliable reference density profile for super-Earth mantles. Furthermore, the observed upper bound of melting temperature, 9430 K at 500 GPa, provides a critical constraint on the accretion energy required to melt the mantle and the prospect of driving a dynamo in massive rocky planets. The authors here report high melting temperatures of MgSiO3 at 500 GPa by direct shockwave loading of pre-synthesized dense bridgemanite. This is essential data to understand the thermal evolution of the interiors of terrestrial (exo-)planets. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink