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Obsidian hydration dates glacial loading?

I Friedman, K L Pierce, J D Obradovich

    Science (New York, N.Y.)
    |May 18, 1973
    PubMed
    Summary
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    Obsidian hydration rind analysis reveals distinct age groups, correlating with volcanic emplacement 176,000 years ago and glacial events. This method dates geological formations in Yellowstone National Park.

    Area of Science:

    • Geochemistry
    • Geochronology
    • Glacial Geology

    Background:

    • Obsidian Cliff, Yellowstone National Park, provides a valuable geological record.
    • Hydration rind analysis is a method for dating volcanic glass and geological events.

    Purpose of the Study:

    • To analyze hydration rind thicknesses on obsidian from Obsidian Cliff.
    • To correlate these measurements with known geological events, including volcanic emplacement and glaciation.

    Main Methods:

    • Measurement of hydration rind thicknesses on thin sections of obsidian.
    • Comparison of rind thicknesses with established dates from potassium-argon dating and glacial moraines.

    Main Results:

    • Three distinct groups of hydration rinds were identified, with average thicknesses of 16.3, 14.5, and 7.9 micrometers.

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  • The oldest rind group (16.3 micrometers) corresponds to the obsidian flow's emplacement 176,000 years ago.
  • The younger rind groups (14.5 and 7.9 micrometers) correlate with obsidian pebbles from the Bull Lake and Pinedale glacial moraines, respectively.

    • Conclusions:

    • Hydration rind thickness provides a reliable proxy for dating geological events in Yellowstone.
    • Cracks and surfaces with younger hydration rinds suggest formation due to glacial loading during the Bull Lake and Pinedale glaciations.