Isotope anomalies induced in laboratory distillation

Details Isotope anomalies induced in laboratory distillation Isotope anomalies induced in laboratory distillation

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.319..576e&link_type=abstract

Nature (ISSN 0028-0836), vol. 319, Feb. 13, 1986, p. 576-578.

Computer Science

14

Allende Meteorite, Distillation, Isotope Effect, Magnesium Isotopes, Meteoritic Composition, Pyroxenes, Chemical Fractionation, Inclusions, Mass Spectroscopy

Scientific paper

High-temperature distillation experiments have been carried out at 0.00005 torr on terrestrial pyroxene crystals in order to measure the concentrations of Mg-24, Mg-25, and Mg-26. The isotope measurements were carried out using a 61-cm multi-cup mass spectrometer. The raw spectrometric data were corrected for isotope fractionation using a power law and the Rayleigh law. It is found that the sample residues were depleted in Mg-26 and the condensates were enriched in Mg-26 relative to non-distilled standards. The depletion of the sample residues mimics the isotope anomalies observed in Allende coarse-grained and fine-grained inclusions. The distillation-induced fractionation and residual isotope effects in Mg are listed in a table.

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