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Related Experiment Videos

Pollen influx and volcanic ash.

P J Mehringer, E Blinman, K L Petersen

    Science (New York, N.Y.)
    |October 21, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Pollen influx analysis reveals volcanic ashfall durations and seasonal impacts. This method helps differentiate ash layers from Glacier Peak and Mount Mazama eruptions, detailing ecological effects.

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    Area of Science:

    • Paleoecology
    • Volcanology
    • Palynology

    Background:

    • Pollen influx analysis estimates depositional event durations.
    • Volcanic ashes provide insights into ashfall seasonality and ecological impacts.

    Purpose of the Study:

    • To apply pollen influx to volcanic ashes for chronological and ecological data.
    • To analyze Glacier Peak and Mount Mazama ash deposits.

    Main Methods:

    • Pollen influx analysis of volcanic ash layers.
    • Radiocarbon dating for age determination.
    • Analysis of fossil pollen and algae.

    Main Results:

    • Two Glacier Peak ash falls dated ~11,250 years ago were separated by 10-25 years.

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  • Mount Mazama ashfall (~6700 years ago) began in autumn, with 4.6 cm deposited before spring.
  • Mazama ashfall lasted nearly 3 years, causing temporary low lake productivity and altered sagebrush steppe vegetation.

    • Conclusions:

    • Pollen influx studies offer valuable chronological and regional details for Cascade Range tephra.
    • The method can distinguish between ash deposits from different volcanic events.
    • Ecological impacts of Mazama ashfall were short-lived on aquatic and terrestrial ecosystems.