Condensation of Rocky Material in Astrophysical Environments
By Denton S. Ebel. 2023
166 citations recorded by the source corpus.
Volatility-dependent fractionation of the rock-forming elements at high temperatures is an early, widespread process during formation of the earliest solids in protoplanetary disks. Equilibrium condensation calculations allow prediction of the identities and compositions of mineral and liquid phases coexisting with gas under presumed bulk chemical, pressure, and temperature conditions. A graphical survey of such results is presented for systems of solar and nonsolar bulk composition. Chemical equilibrium was approached to varying degrees in the local regions where meteoritic chondrules, Ca-Al-rich inclusions, matrix, and other components formed. Early, repeated vapor-solid cycling and homogenization, followed by hierarchical accretion in dust-rich regions, is hypothesized for meteoritic inclusions. Disequilibrium chemical effects appear to have been common at all temperatures, but increasingly so in lessrefractory meteoritic components. Work is needed to better model high-temperature solid solutions, indicators of these processes.
Subfields: Astronomy and Astrophysics, Information Systems
View Paper: https://www.semanticscholar.org/paper/44138c3d814b51dd990f25207dfdd178b108869a
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Citations in the corpus
- Chemical heterogeneity on Mercury's surface revealed by the MESSENGER X-Ray Spectrometer (2012, unknown): “9 of 15 highly reducing conditions [Ebel, 2006].”
- Chondrules and the Protoplanetary Disk (2011, background): “Liquids become stable if chondritic dust is enriched by a factor of 10 or more, and under these more oxidizing conditions, significant fractions of the iron condense into silicates rather than in metal (Ebel 2006, Fedkin & Grossman 2006).”