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Koniuji reported activity



Event Name : Koniuji 15200 yBP

Start: 15200 (± 5000 Years) Years BP Ar/Ar

Lava flow: BibCard
Eruption Type:Effusive
Eruption Product: basaltic andesite BibCard

Description: From Jicha (2009): "Four experiments on two samples (KON-07-01 and -02) of a clinopyroxene-phyric basaltic andesite flow along the southern shoreline gave a weighted mean 40Ar/39Ar age of 15.2+/-5.0 (2 sigma) (Figs.2-4 [in original text]).This lava flow contains large (>1 cm) augite megacrysts similar to those found in the basalts of Roundhead volcano on Kanaga Island ~250 km to the west (Brophy and others, 1999)."

"40Ar/39Ar age determinations indicate that it is a young stratovolcano that emerged above sea level at ~15.2 ka."

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Page modified: March 30, 2017 14:36
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