Paleomagnetically defined brief lifespans for two large shield volcanoes in the Cascades Arc
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- Data Release: USGS data release - Dataset Establishing Temporal Duration of Two Shield Volcanoes in Northern California
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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.
Study Area
| 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 |