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Glassy microspherules (microtektites) from an upper devonian limestone.

K Wang

    Science (New York, N.Y.)
    |June 12, 1992
    PubMed
    Summary
    This summary is machine-generated.

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    Upper Devonian microspherules found in marine limestone share properties with impact microtektites. These findings suggest a significant bolide impact event approximately 365 million years ago.

    Area of Science:

    • Geochemistry
    • Paleontology
    • Planetary Science

    Background:

    • Microspherules found in Upper Devonian marine limestone exhibit unusual geochemical signatures.
    • These deposits are immediately overlain by an anomaly of siderophile and chalcophile elements.

    Purpose of the Study:

    • To investigate the origin and characteristics of Upper Devonian microspherules.
    • To determine if these microspherules are indicative of a bolide impact event.

    Main Methods:

    • Geochemical analysis of microspherule composition.
    • Microscopic examination of microspherule morphology and inclusions.
    • Comparison of properties with known impact-derived microtektites.

    Main Results:

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  • The microspherules are glassy, possess splash-form shapes, and contain spherical vesicles and lechatelierite inclusions.
  • Oxide compositional variations align with those observed in known microtektites.
  • Geochemical anomalies suggest a significant extraterrestrial event.

    • Conclusions:

    • The properties strongly suggest an impact origin for the Upper Devonian microspherules.
    • A bolide impact event around 365 million years ago on the South China Plate is hypothesized.
    • This impact may have triggered faunal extinctions on eastern Gondwana.