Alaska Volcano Observatory
Koniuji reported activity
EVENT SPECIFIC INFORMATION
Event Name : Koniuji 3100 yBP
|Start: 3100 (± 1900 Years) || Years BP Ar/Ar || |
|Lava flow: ||
|Lava dome: ||
|Eruption Product: || andesite ||
From Jicha (2009): "Lavas and domes from a 3.1 ka and younger andesitic complex represent the latest major phase of activity on the island are the most evolved."
"An angular block from within the hornblende bearing andesitic dome complex yielded a 40Ar/39Ar age of 3.1+/-1.9 ka. A single experiment on sample KON-07-05, a hornblende andesite collected at 177 m above sea level from near the center of the island, failed to yield a significant amount of radiogenic 40Ar. This sample likely represents the youngest part of the hornblende andesite unit and erupted within thelast three millennia."
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