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Composition of the metal phases in ordinary chondrites - Implications regarding classification and metamorphismThe paper examines the composition of metal phases and metamorphism in ordinary chondrites. It is shown that below 550 C increasing Co decreases the equilibrium kamacite Ni concentration of an alpha to gamma system, and that the equilibrated L chondrites have kamacite and taenite Co concentrations in the L-group range. Metal-phase studies of petrologic type-3 ordinary chondrites with highly unequilibrated silicates showed a wide range in the degree of matrix kamacite equilibration; in the three most unequilibrated chondrites most taenite is clear, and the high Ni content shows that metamorphic temperatures were lower than 400 C in these meteorites.
Document ID
19800042002
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Afiattalab, F.
(California Univ. Los Angeles, CA, United States)
Wasson, J. T.
(California, University Los Angeles, Calif., United States)
Date Acquired
August 10, 2013
Publication Date
March 1, 1980
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 44
Subject Category
Lunar And Planetary Exploration
Accession Number
80A26172
Funding Number(s)
CONTRACT_GRANT: NGR-05-007-329
Distribution Limits
Public
Copyright
Other

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