Other
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..341e&link_type=abstract
Lunar and Planetary Science, volume 27, page 341
Other
1
Fractionation: Isotope, Impacts, Potassium: Isotopes, Volatiles
Scientific paper
The rocky planets, the Moon and some meteorites are depleted in elements that are volatile at temperatures below about 1200 K. Large variations in condensation or vaporisation temperatures can be invoked to account for the segregation of volatile from refractory elements. Starting with an initial hot nebula, incomplete condensation and removal of uncondensed volatiles is one alternative; partial vaporisation and removal of volatiles by heating of cold nebular material is another possibility. Incomplete mass transport across spatial temperature gradients can cause mass dependent variations in isotopes, in particular, of light mass elements. If high temperature vaporisation occurs across a liquid-vacuum interface (Rayleigh distillation), mass flow is unidirectional, resulting in complete removal of vaporised material. In a gaseous envelope mass transport could occur bidirectionally through vaporisation as well as collisional capture such that, in the limiting case, the system will approach equilibrium with no net isotope fractionation.
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