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Elemental abundances in stone meteorites.Measurement of abundances of Na, Al, Sc, Cr, Mn, Fe, Co, and Cu by instrumental neutron activation analyses of 103 chondrites and 17 achondrites. Various sources of error in the method, including sampling errors, are discussed in detail. Examination of the patterns of coherence of the elements determined suggests the presence of effects of fractionation during condensation from the solar nebula of matter parental to chondrites. Such effects seem to be exhibited both in the abundances of lithophilic elements, perhaps being related to varied temperatures of accretion and in the abundances of those elements which would be affected by metal-silicate fractionation in the solar nebula. Atomic abundances relative to Si vary little in carbonaceous chondrites, suggesting that efficient mixing processes operated on these meteorites prior to or during their formation. It is suggested that, at present, no single class of carbonaceous chondrites is clearly more primitive than another. Carbonaceous and unequilibrated ordinary chondrites may represent aggregates of material accreted from the solar nebula at relatively low temperatures. The present data support a model of equilibration and minor mobilization of nonvolatile elements within small domains of chondrites after accretion. Such a model would be consistent with the petrologic types of Van Schmus and Wood (1967).
Document ID
19720054197
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Schmitt, R. A.
(Gulf General Atomic, Inc. San Diego, Calif., United States)
Goles, G. G.
Osborn, T. W.
(California, University La Jolla, Calif., United States)
Smith, R. H.
Date Acquired
August 6, 2013
Publication Date
June 30, 1972
Publication Information
Publication: Meteoritics
Volume: 7
Subject Category
Space Sciences
Accession Number
72A37863
Funding Number(s)
CONTRACT_GRANT: NGL-38-003-010
CONTRACT_GRANT: NGL-38-002-020
CONTRACT_GRANT: NASW-843
CONTRACT_GRANT: NSG-319
Distribution Limits
Public
Copyright
Other

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