Radiocarbon Analysis of Tree Rings from a 15.5-Cal kyr BP Pyroclastically Buried Forest: A Pilot Study
2007; Cambridge University Press; Volume: 49; Issue: 2 Linguagem: Inglês
10.1017/s003382220004296x
ISSN1945-5755
AutoresKazuho Horiuchi, Shinya Sonoda, Hiroyuki Matsuzaki, Motonari Ohyama,
Tópico(s)Tree-ring climate responses
ResumoWe have determined the radiocarbon ages for 40-yr-interval tree rings in 2 fossil trees of the Towada Hachinohe buried forest, northeastern Honshu Island, Japan. The 14 C ages range from 13.0 to 13.3 kyr BP (about 15.5 cal kyr BP). The weighted average of the 14 C age of the outermost 5 rings is 13,133 ± 33 BP, which can be calibrated to 15,363–15,679 cal BP by using the IntCal04 standard curve (Reimer et al. 2004). The estimated δ 14 C values range between 265 and 300% and show approximately sinusoidal fluctuation of an indicated ∼200-yr cycle, perhaps reflecting contemporary solar activity change. Comparison between the tree 14 C profile and the Cariaco Basin 14 C record provides further information on the accurate date of the Towada Hachinohe buried forest and the eruption that produced it. 14 C analysis of tree rings from the buried forest may contribute to the construction of a better 14 C calibration curve and the elucidation of solar activity change during the last glacial period, as well as possible global and regional impacts of the huge eruption from Towada Volcano.
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