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Allende meteorite: a high-voltage electron petrographic study.

H W Green, S V Radcliffe, A H Heuer

    Science (New York, N.Y.)
    |May 28, 1971
    PubMed
    Summary
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    The Allende meteorite

    Area of Science:

    • Meteoritics
    • Cosmochemistry
    • Planetary Science

    Background:

    • Carbonaceous chondrites, like the Allende meteorite, provide insights into early solar system processes.
    • Understanding meteorite substructure is crucial for reconstructing planetary formation.
    • Previous studies have analyzed meteorite composition and structure.

    Purpose of the Study:

    • To investigate the microstructural characteristics of the Allende meteorite.
    • To compare the substructure of the Allende meteorite with other extraterrestrial and terrestrial samples.
    • To determine the sequence of events during the formation of the solar system.

    Main Methods:

    • Preparation of electron-transparent sections using ion-thinning.
    • Examination of samples via high-voltage (800-kilovolt) transmission electron microscopy.

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  • Microstructural analysis of matrix crystals, carbon inclusions, and chondrules.

    • Main Results:

    • Allende meteorite matrix consists of olivine crystals (0.01–5 µm) with intergranular graphite.
    • Chondrules show significant radiation damage, unlike the matrix.
    • Undeformed chondrules and matrix contain negative crystals and submicroscopic exsolution lamellae in pyroxenes.

    Conclusions:

    • Chondrule irradiation occurred before cold accretion during solar system formation.
    • The Allende meteorite has remained undisturbed since its formation.
    • Microstructural evidence supports a specific timeline for early solar system events.