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Science 28 March 1986:
Vol. 231. no. 4745, pp. 1542 - 1544
DOI: 10.1126/science.231.4745.1542
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Articles

Cometary Particles: Thin Sectioning and Electron Beam Analysis

J. P. BRADLEY 1 and D. E. BROWNLEE 2

1 McCrone Associates, Inc., 2820 South Michigan Avenue, Chicago, IL 60616.
2 Department of Astronomy, University of Washington, Seattle, WA 98195.

Thin sections (500 to 1000 angstroms thick) of individual micrometeorites (5 to 15 micrometers) have been prepared with an ultramicrotome equipped with a diamond knife. Electron microscopic examination of these sections has revealed the internal structures of chondritic micrometeorites, and a subset of highly porous, fragile particles has been identified. Delicate meteoritic materials such as these are characteristic of debris from cometary meteors.

Submitted on September 27, 1985
Accepted on January 21, 1986


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