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Science 27 July 1979:
Vol. 205. no. 4404, pp. 395 - 397
DOI: 10.1126/science.205.4404.395
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Articles

Magnetite in CI Carbonaceous Meteorites: Origin by Aqueous Activity on a Planetesimal Surface

JOHN F. KERRIDGE 1, ALAN L. MACKAY 2, and WILLIAM V. BOYNTON 3

1 Institute of Geophysics and Planetary Physics, University of California, Los Angeles 90024
2 Department of Crystallography, Birkbeck College, University of London, London WCIE 7HX, England
3 Lunar and Planetary Laboratory, University of Arizona, Tucson 85721

The composition and morphology of magnetite in CI carbonaceous meteorites appear incompatible with a nebular origin. Mineralization on the meteorite parent body is a more plausible mode of formation. The iodine-xenon age of this material therefore dates an episode of secondary mineralization on a planetesimal rather than the epoch of condensation in the primitive solar nebula.

Submitted on March 21, 1979


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Science. ISSN 0036-8075 (print), 1095-9203 (online)