Critique of 'Nebular condensation of moderately volatile elements and their abundances in ordinary chondrites' by Chien M. Wai and John T. Wasson

Details Critique of 'Nebular condensation of moderately volatile elements and their abundances in ordinary chondrites' by Chien M. Wai and John T. Wasson Critique of 'Nebular condensation of moderately volatile elements and their abundances in ordinary chondrites' by Chien M. Wai and John T. Wasson

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..36...14a&link_type=abstract

Earth and Planetary Science Letters, vol. 36, no. 1, Aug. 1977, p. 14-20.

Computer Science

5

Abundance, Chondrites, Condensing, Meteoritic Composition, Volatility, Carbonaceous Meteorites, Chemical Elements, Chondrule, Depletion, Fractionation, Vaporizing

Scientific paper

The abundances of 17 moderately volatile elements in ordinary chondrites show three discrete groupings, significant at the 0.1% level. They reflect mainly condensation on matrix and volatilization from chondrules and coarse metal grains. Elements of high condensation temperature (1300-1000 K) such as Na or Mn are fully condensed on matrix and only partially lost from chondrules and therefore have abundances of 0.7-0.9 the C1 chondrite value. Elements of lower condensation temperature (1000-600 K) such as Ga and Se are fully condensed on matrix but are largely lost from chondrules; they have abundances of 0.4-0.2. Elements of still lower condensation temperature such as Bi and Tl are incompletely condensed on matrix and are lost from chondrules; they have abundances ranging from 0.1 to <=0.001. Gas-dust fractionation may have produced second-order effects, but it cannot be the sole mechanism, contrary to claims by Wai and Wasson. There is much experimental evidence for depletion of volatiles from chondrules, and since chondrules comprise 3/4 of the meteorite, Wai and Wasson are not justified in ignoring their contribution to the volatile-element budget.

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