9:45 AM - 10:00 AM
[SGL39-04] Unspiked K-Ar dating for the central part of Kuju volcano, Kyushu, Japan
Keywords:Kuju volcano, K-Ar dating, Unspiked method
New ages for the lava on south Ogigahana Volcano is 34±3 (1σ) ka, agree with the reported TL ages (34-37 ka; Okuno et al., 2013) and the stratigraphy. The sample from the lower unit yield 65±8 ka, similar age with the TL ages for the summit of the volcano and adjacent Iwaigodake volcano (60-70 ka; Okuno et al., 2013).
The age for the lava from Inaboshi Yama, a part of Nakadake volcano, is 46±12 ka, showing it formed soon after Handa pyrocrastic flow eruption.
We measured also the essential rock in Matsunodai Debris Abaranche Deposit, probably originated from Mimatayama volcano. The obtained age is 36±12 ka, in agreement with the 14C age of ca. 20ka in its error.
These results show that a several volcanic bodies were formed in ca.54-30 ka in the central part of Kuju volcano.