Physics
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981geokh.....1802s&link_type=abstract
(Akademiia Nauk SSSR, Vsesoiuznyi Simpozium po Stabil'nym Izotopam v Geokhimii, 8th, Moscow, USSR, Nov. 11-14, 1980.) Geokhimiia
Physics
Cosmochemistry, Isotope Effect, Meteoritic Composition, Planetary Composition, Protoplanets, Carbonaceous Chondrites, Gravitational Effects, Heterogeneity, Magnesium Isotopes, Nebulae
Scientific paper
Isotope shifts are observed in 33 elements in meteorites. In many cases the shifts cannot be explained by physicochemical or nuclear causes, and they are not consistent with Sobotovich's (1967) contention that the protoplanetary cloud contained at least two genetically different substances. For magnesium, the shifts do not lend themselves to a simple mixing of two strictly defined systems. Using the magnesium isotope triad as an example, the effect of gravitational mass fractionation on the compression stage of the protosolar nebula is calculated. As a result of the turbulent convection that arises from the thermal shock of the ignited sun, magnesium with an isotopic composition that is heavy in comparison with the composition established there during gravitational mass fractionation enters the zone of condensation of low-volatility elements.
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