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Cometary particles: thin sectioning and electron beam analysis.

J P Bradley, D E Brownlee

    Science (New York, N.Y.)
    |March 28, 1986
    PubMed
    Summary
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    Researchers prepared thin sections of micrometeorites for electron microscopy. This revealed internal structures and identified highly porous, fragile particles characteristic of cometary meteors.

    Area of Science:

    • Cosmic Dust Analysis
    • Planetary Science
    • Astrobiology

    Background:

    • Micrometeorites are extraterrestrial particles that enter Earth's atmosphere.
    • Understanding their composition and structure provides insights into early solar system materials and potential extraterrestrial life.
    • Previous studies have focused on larger meteorites, with limited analysis of the internal structure of smaller micrometeorites.

    Purpose of the Study:

    • To investigate the internal structure of individual micrometeorites using advanced microscopy techniques.
    • To identify and characterize unique micrometeorite types, particularly those with high porosity and fragility.
    • To determine the origin of these delicate meteoritic materials, linking them to specific celestial bodies.

    Main Methods:

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  • Preparation of ultra-thin sections (500-1000 angstroms) of individual micrometeorites (5-15 micrometers) using an ultramicrotome with a diamond knife.
  • Detailed electron microscopic examination of the prepared thin sections to visualize internal microstructures.
  • Classification of micrometeorites based on observed structural characteristics, porosity, and fragility.

    • Main Results:

    • Electron microscopy successfully revealed the detailed internal structures of chondritic micrometeorites.
    • A subset of micrometeorites was identified as highly porous and fragile.
    • The observed delicate structures are consistent with materials originating from cometary meteor debris.

    Conclusions:

    • The study demonstrates the feasibility of analyzing the internal structure of small micrometeorites.
    • The identification of porous, fragile particles supports the hypothesis of cometary origins for a portion of extraterrestrial dust.
    • This research enhances our understanding of cosmic dust composition and its implications for solar system evolution.