Item talk:Q68880

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     "name": "Argon geochronology of late Pleistocene to Holocene Westdahl volcano, Unimak Island, Alaska",
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         "value": "10.3133/pp1709D",
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     "datePublished": "2005",
     "dateModified": "2019-05-01",
     "abstract": "High-precision 40Ar/39Ar geochronology of selected lavas from Westdahl Volcano places time constraints on several key prehistoric eruptive phases of this large active volcano. A dike cutting old pyroclastic-flow and associated lahar deposits from a precursor volcano yields an age of 1,654+/-11 k.y., dating this precursor volcano as older than early Pleistocene. A total of 11 geographically distributed lavas with ages ranging from 47+/-14 to 127+/-2 k.y. date construction of the Westdahl volcanic center. Lava flows cut by an apparent caldera-rim structure yielded ages of 81+/-5 and 121+/-8 k.y., placing a maximum date of 81 ka on caldera formation. Late Pleistocene and Holocene lavas fill the caldera, but most of them are obscured by the large summit icecap.",
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         "name": "Moore, Richard B. rmoore@usgs.gov",
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         "name": "Calvert, Andrew T. acalvert@usgs.gov",
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