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Paleomagnetically defined brief lifespans for two large shield volcanoes in the Cascades Arc

Journal of Volcanology and Geothermal Research
By: , , , , , , and 
https://doi.org/10.1016/j.jvolgeores.2022.107740

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Abstract

Mafic to intermediate shield volcanoes with multi-cubic-kilometer eruptive volumes are common in the Cascades Volcanic Arc, but little is known about their eruptive histories as either singular or sustained episodes, or the total time required for their construction. Paleomagnetic data were collected from the lava flows of Ash Creek Butte (17 sites) and Crater Mountain (14 sites) in northern California; both volcanoes are large shields with total volumes of ∼11 km3 each. Tightly clustered paleomagnetic results at both volcanoes, when coupled with analysis of geomagnetic secular variation, suggest that each edifice was built in only a few centuries, possibly in as little time as 50–90 years, indicating sub-century to century scale eruptive durations for two sizeable regional shield volcanoes within the Cascades Arc. These rapidly built shield volcanoes are substantially larger than typically defined monogenetic volcanoes, yet both are wholly formed within a single ‘episode’ at the limits of temporal resolution. Paleomagnetic methods provide a high-resolution tool that can be applied to understanding the tempo of regional volcanism in arcs.

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    Publication type Article
    Publication Subtype Journal Article
    Title Paleomagnetically defined brief lifespans for two large shield volcanoes in the Cascades Arc
    Series title Journal of Volcanology and Geothermal Research
    DOI 10.1016/j.jvolgeores.2022.107740
    Volume 434
    Year Published 2023
    Language English
    Publisher Elsevier
    Contributing office(s) Geology, Minerals, Energy, and Geophysics Science Center, Volcano Science Center
    Description 107740, 10 p.
    Country United States
    State California, Oregon, Washington
    Other Geospatial Cascades Volcanic Arc
    Google Analytic Metrics Metrics page
    Additional publication details