Magnesium and Silicon Isotopes in Layered Chondrules from EL Djouf (CR2)

Details Magnesium and Silicon Isotopes in Layered Chondrules from EL Djouf (CR2) Magnesium and Silicon Isotopes in Layered Chondrules from EL Djouf (CR2)

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..575h&link_type=abstract

Lunar and Planetary Science, volume 27, page 575

Computer Science

3

Chondrules, Chondrules: Formation, Isotopes, Mass Fractionation, Probes: Ion

Scientific paper

Chondrules are widely believed to have formed in the solar nebula by flash heating of dust aggregates followed by rapid, but not instantaneous cooling; multiple cycles of melting and cooling may have been involved. Evaporative loss of volatile elements during these melting events may have been accompanied by isotopic mass fractionation, which if measurable, would provide additional information on the chondrule-formation process. Recent O-isotope measurements were made on some large layered chondrules from the El Djouf (CR2) chondrite. The rims of these chondrules are more ~17,18-rich than the associated cores, and cores and rims exhibit a slope ~0.7 relationship on an oxygen 3-isotope plot. A slope 0.7 relationship can be deconvolved into an "exotic" component (assumed to lie along a slope ~ 1 line as observed in CAIs) and a mass fractionation component (slope ~0.5). One way of producing mass fractionation is through isotope exchange during low-temperature aqueous alteration, with the solids becoming more 17,18O-rich. Alternatively, the oxygen isotope differences between core and rim may reflect different degrees of evaporative fractionation during the chondrule and rim melting events.

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